Hello, I've done a video on how I made my blades m.ua-cam.com/video/0U8iMWmxgO0/v-deo.html The blades in the balancing video I made but are too heavy for my coaxial helicopter, they would be ok for a single rotor with collective pitch. They were made by folding the skin around the aluminium spar. The spar was solid aluminium 6082t6 and milled to better fit the aero foil shape, then the skin was fixed to the spar with 3m double sided tape. This design was also too tail heavy with its chord mass at 31% it needs to be 25% in order to spin safely. This is partly why I changed the design but the balancing procedure is the same.
For gyrocopter blade chord is matter? For gyrobee having 210mm chord and 11ft long blade(per blade) but I have 178mm chord and 12.2ft long (per blade) is it ok to use ? Or chord and all to be match?
I'm not sure if I can answer your question but I need more information. Please explain in more detail what you are asking. You have a gyrobee gyrocopter and want to know if a 178mm chord and 12.2 ft long blade will work ?
@@Ben-Dixey yes exactly! It’s a project for us so we just making gyrobee but unfortunately the blade size is 178 mm -12.2ft is available in china to purchase , they telling it’s fine to use ….most of home made Chinese gyrocopters were using this type of blade, but am not confident on that
@@mohamedshafeelmohamedbilal6364 Have a read of this forum thread. They discuss different blades on the gyro bee. www.rotaryforum.com/threads/gyrobee-blades.9720/ I expect the 178mm and 12.2ft long blades will work but it will have certain flight characteristics. Best to ask on the forum for more details.
I'm a senior researcher at Heimkeeper Co., Ltd. Our company has an idea to reduce propeller noise and vibration of helicopters and drones.We're done with the experiment.We have applied for a utility model and a patent As a result of several experiments with small propellers, the current noise and vibration reduction effect is about 30%. Looking forward good news from you soon
Thanks for the inspiration Cam, it's because of people like you that I've got this far. Hope you're still tinkering. Interesting comment on the blade rising. 😀
Thanks 👍 You will be balancing your rotor any time soon. As you have lead/lag adjustment you will be able to get the chord mass in the centre. Then it will come down to how accurate the machining was on the rotor hubs. Looking forward to your next few videos and seeing how you tackle it.
@@prash007more Sure, looking at the rotor from above the CG of the blades should pass through the centre of the rotor head. Looking from the side the CG of the blades should pass through the teeter bolt when in flight. This is how you determine the rotor undersling. You use trigonometry to work out the blade coning angle, to find how much the blades will flex up or cone you need the centrifugal force and the maximum take off weight. These are the two sides of the triangle the it's just trigonometry to find the angle. From watching this video you can work out where the CG of the blade is and then the height of the undersling. Hope this makes sense, but message back if it's still not clear.
Well it has its merits, but there are better designs. The new mosquito blades are the design to strive for in my opinion. Got to get that chord mass at 25%.
Thanks. A friend of mine said about doing it that way but was probably first done by the Romans. Not for rotor blades of course but other levelling jobs. 😉
Hi, Are you using this blade and this hub in your flying machine at the moment. I believe you have changed to the blade and you are currently using the one which has a solid D spar, the one that has a 4.75inch chord and a different rotor hub. Please correct me if I'm wrong
Hi, yes that is correct, the blades and hub in this video were not used. I just used them for the balancing demo. The CG location of the blade with blade straps and balancing was done in the same way on the new blade sets.
Hi, no autorotation is possible and at the height I'm operating autorotation wouldn't be much of an advantage as it takes 50-75ft to transition from powered flight to auto.
@@alexalvarez2495 yes that's something to be aware of. The inclinometer needs to be placed at its balance point to. I assumed the balance point was in the middle of the inclinometer but I didn't check that.👍
I'm wanting to make one a little smaller but use it like a gyrocopter but without a cart just with an engine for the engine on the back run to take off without a cart just the propeller and the engine for the engine
Thank you, yes collective would be better I think, if I had twin engines as well that would be even safer. Ground resonance I believe can only happen with more than two blades on the same hub. Dont think it can happen on a coaxial with twin teetering rotors.
Yeah, everything takes ages, but the next test and video will be exciting (for me at least). I'll put on a head cam so you can see what I see. Will be so pleased if it can demonstrate the required lift.
Everything has a cycles to failure index. I would have to wonder at what time these blades will have to be replaced. A rather critical component of a helicopter that we would never want to come apart when in motion.
Hi, yes determining the service life of a component is difficult. These particular blades weren't used as I made some much lighter ones. The new blades have a spar with a cross sectional area which will take the centrifugal loads at the materials fatigue strength. Parts built to this strength will not have a limited service life. However that's only centrifugal loads where actually there are other load factors like twisting and blade bending. These would reduce the life. Perhaps the only way to find out some numbers is to have a mechanical jig for testing blades running 24/7. This of course is very expensive research and beyond my means.
@@JeffChoppah altering blade speed for yaw is an interesting idea, I've heard of using a differential for driving the rotors and braking one rotor to achieve yaw but the craft would also reduce in lift which wouldn't be ideal. In a variable pitch coaxial you can increase the pitch on one rotor and decrease it on the other that would produce yaw but keep the lift the same. The tail fins on the Nolan helicopter seemed to work well and it's definitely the simplest solution. Time will tell if it's the right decision.
25% is where the centre of pressure is located on a naca 0012 aerofoil. If the balance is not at 25% then forces will be present in the collective stick. Weight either side of 25% will cause the blade to want to go to 0 pitch.
Did you machine your own reduction unit cogs or buy them I've been looking into buying or have someone machine one for a 1980 yamaha exciter 443 motor I bought for ultralight project
Initially I had the synchronous belt pulleys made as toothed blanks and I machined the spokes to make them as light as possible but when I changed the ratios I made the drive pulley from scratch. I made a fly cutter for the milling machine using Hss tool steel ground to shape by hand but using a profile projector to get the contour accurate. This video shows a bit more. ua-cam.com/video/yUd9Vg9V0qI/v-deo.html what sort of ultralight project have you got in mind ?
Hi, I can't share my drawings in case there is something wrong with my design. When it's been proven for hundreds of hours then I would consider it. I wouldn't want anybody copying any potential mistakes.
Hi, the center of pressure of a 0012 blade (also called the aerodynamic center) is 25% chord, this is why the center of mass of the blade also needs to be 25% chord.
Hi there, I was wondering if the big bold in the middle of the rotors that sticks out quite a bit doesn't affect the balancing off the rotors? Or is this identical to how the rotors will be installed to the helicopter? Great videos by the way really enjoying them!
Hi and thanks, yes the bolt needs to be balanced in its position. I didn't use this rotorhead in favour of a different design, the new design has studs which are the same length and the same nuts both sides. It's just like balancing a wheel where all positions in a 360 circle must have the same mass from the centre of rotation. Where you can't add weight the centre position needs to be altered with shims instead. A out of balance centre bolt will affect the shimed position.
🔴 What Is Islam? 🔴 Islam is not just another religion. 🔵 It is the same message preached by Moses, Jesus and Abraham. 🔴 Islam literally means ‘submission to God’ and it teaches us to have a direct relationship with God. 🔵 It reminds us that since God created us, no one should be worshipped except God alone. 🔴 It also teaches that God is nothing like a human being or like anything that we can imagine. 🌍 The concept of God is summarized in the Quran as: 📖 { “Say, He is God, the One. God, the Absolute. He does not give birth, nor was He born, and there is nothing like Him.”} (Quran 112:1-4) 📚 🔴 Becoming a Muslim is not turning your back to Jesus. 🔵 Rather it’s going back to the original teachings of Jesus and obeying him.
My most of doubts get cleared by this video regarding rotor blade balancing.. it's really informative. keep sharing.. How u design n calculated the rotor blade strength? Do u have any design calculation to share? if u don't mind. How u chose the blade length, cord, air profile, also the main spar, material of the blade.. n all these things..?
Hi, thanks for the comment, I've been thinking about doing a rotor strength video, there are a bunch of calculations i did to determine such things as rotor hub thickness, blade strap thickness, rotor spar strength, bolt shear strength ect. I can only determine these values in a basic calculation and you could go much further than I did using cad and stress analysis. I'm no expert but could share my basic understanding.
The Gyrotor instructions for blade chord balance said to have the blade straps and blade retaining bolts in place, this makes sense to me but I am happy to be persuaded otherwise. Tip weights is something I would definitely consider. Thanks for the comment.
@@prash007more I believe tip weights are sometimes added to reduce cyclic control sensitivity. They are sometimes used on gyrocopters and helicopters. I don't know if they will be necessary on my coaxial, I won't know until I try it. I'm hoping they won't be needed as it changes the centrifugal forces on the blade and the coning angles.
That's correct, it must balance at the aerodynamic centre and I would agree that mounting the blade at this location is sensible. However I don't think Robinson mount the blade here, they are mounted further back and there is a benefit to doing this. It was explained to me but I can't remember the reason now.
Yes. Love my old lathe, I found it for sale 1/2 a mile down the road and paid £200 for it. I put on a digital read out and a digital phase inverter. It will probably last a lot longer even having been built in the 50/60s. These blades aren't going to be used, I just used these for the balancing demo, the blades on the helicopter have inserts in the ends to prevent centrifugal air pumping which will drag the blades by a few hp. Rounded ends I'm sure would be even better but don't know by how much.
Merhabalar ben. 30 kilogram kendi ağırlığında helikopter yapmayı düşünüyorum bunun için nasıl bir pervane ölçüsü çıkarmam lazım ( uzunluk .kalınlık ve en) olarak
That is a huge question to answer and I can't answer it. There is guidance on rotor blade size if you look up disc loading, solidity ratios, and aspect ratios. But ultimately what I did was copy what someone else had done. If you can find an example of a 30kg helicopter and its rotor dimensions that is. 30 kg is very light are you making a model ?
This great illustration buddy. Makes life easy...2questions for now...stage 2 balancing with m6 washers is that same as what they do with blade tracking? Then last stage balancing with that thin bar, is that necessary for blades supported with a bolt or all blades need that, eg the rotor head of this model am building doesn't seem like would be off on that, since it's holding pin on rotor head runs at center of the rotor shaft.
Thanks Jeff, tracking is done by spinning the rotor blades at flight rpm with some pitch but not enough to take off, adjustments are made on individual blade pitch so that they rotate in the same plane. I haven't done any tracking yet but I need to do it next test. Every rotor needs to spin on its centre of mass just like a wheel needs to spin on its centre of mass. When a car wheel is balanced you add weight to one section of the wheel this is because you can't change the wheels centre bolting point. With a rotor we can add weight like a wheel to the blade tips as a little weight makes a big difference over the length of the blade but much more weight would be needed to balance in the chord direction. Instead the rotor is shifted from its normal axis with shims. Alternatively you can lead or lag a blade in order to change its chord-wise mass distribution. No matter how accurate your blade retaining bolt holes are there will be a slight deviation at the blade tip to where it needs to be to balance. I'm not sure if the furia plans have included teeter hinge shims but it would be good to include them so you can get that rotor spinning with minimal vibration.
@@Ben-Dixey I see later on realised actually tracking is all about connecting rods and blade flaps adjustments...while what you did was rotor balancing itself...it's a good illustration will sure borrow some tips when my time comes...seems for my case I will need to dismount the entire rotor head and balance it with blades since they can't be dismounted seperately as your case....the easiest way for me with blades is using tubes and bars as shown in the plans...did one pic post with a prototype trying to figure out tube sizes...
Hello Ben, well been a while, just a quick one. Currently balancing my blades, and according to your video the washers are placed at the tip, I watched another RC blade balancing video and the guy says the weight should be added at the COG of the blade, as adding anywhere else offsets the individual blade initial COG....does that make sense? Cheers.
Im afraid of helicopters, they are of the most unsafe aircraft, so it really takes guts to want to make one form scratch, even balancing the blades like in the video can end up in death, if the rotor gets into an unstable oscillation one of the blades can snap and hit you. There is a video of a young guy who was about to do its maiden flight, one of the tail rotor blades broke and hit one of the main rotor blades making them violently shake the helicopter almost ejecting him (he didn't had seat belt on), unfortunately the blade snapped at the right moment as to hit him in the head. I write this not as discouraging or being a bummer but more as a reminder that Is better to be extra careful and never take shortcuts when dealing with such things.
I agree with you, it's a conversation I've had many times with people and assessing the risks is difficult. I believe Munna was unlucky but had he been wearing a seat belt or a helmet I think things would have been different. I also would ask did he do the centrifugal force calculations on the tail rotor, did he use materials of known specification, did he run the tail rotor at higher rpm to check the strength under guarded conditions ? These would all be measures to try and avoid a rotor separation. I have done these things but I know full well there are other parts that could fail and you can't remove all the risks. I have gone back and fourth in my thoughts on whether or not to play with a homebuilt helicopter.
Thank you. A follow up to blade balancing ? For me the process in the video worked and I haven't had to do any further work on balancing. Dynamic balancing would probably be the next step or perhaps fine tuning the method of chord wise rotor balancing.
Again very well explained , and really proper balancing of rotor blades is the secret of your successful spinning test in final video (I had problem of vibrations in propeller of para motor ,I did the same to get the propeller balanced ) ,this is why your rotors were spinning so stable without vibrations . Great job 👍 I wasn't sure that you are not going to use power line to change the pitch of blades in contra rotor system ?! Do you just just have to depend on high RPM for getting airlift ? I shred your video to my friend in hobby aviations . Thnx
Thank you. Yes that's correct the blades are fixed in pitch and engine rpm is used to control lift. It's not as precise as using what's called collective pitch but it's still effective. Have a look at the Nolan helicopter this is where the inspiration came from., m.ua-cam.com/video/B21Xk6tNcBw/v-deo.html
@@Ben-Dixey actually even with fixed pitch it's looked quite controled and stable .. But you can change the position of rotors on their Axis ? To get the cyclic control ?
@@rajeevshagun7409 yes, you have got it. It keeps things simple and lightweight but there is a drawback which is control. With cyclic pitch control using a swash plate it's very sensitive and responsive. With a tilting mast there will likely be a time delay between control inputs and response. I will have to learn to compensate for this but as the Nolan helicopter demonstrates it's very controllable once you have mastered it. I will soon find out what it responds like as I'm getting ready for the next test.
@@Ben-Dixey oh my best wishes are with you ... Don't need to remind you the safety procedures , because you are well aware . The good part of contra rotors is , it has very little chance to get wild spinning due to anti torque rotors failure . Almost no chance . I have seen wild vibrations in main rotors in new copters . But your stuff is balanced blades we can trust it . I wish I would be around you that time .
@@rajeevshagun7409 Thanks for the encouragement. I will be recording the final testing procedures and then 🤞learning to fly it so everyone can experience it with me. 👍
I know that this rotor cannot be firm, it has to be flexible. Which reinforcement plate do you use? Is it aluminum? Is it a stringer please?
The reinforcement plate, I think you are referring to, what I would call the spar is aluminium 6082t6
Is this iron blades?
So the hollow rotor blade is a must do thing?
This journey is absolutely amazing. I wish you had them in order from start to "now"....
Thank you, I'll create a playlist so it's in a better order.
saludos desde Colombia ? una pregunta como fabrico las palas del rotor ??????
Hello, I've done a video on how I made my blades m.ua-cam.com/video/0U8iMWmxgO0/v-deo.html
The blades in the balancing video I made but are too heavy for my coaxial helicopter, they would be ok for a single rotor with collective pitch. They were made by folding the skin around the aluminium spar. The spar was solid aluminium 6082t6 and milled to better fit the aero foil shape, then the skin was fixed to the spar with 3m double sided tape. This design was also too tail heavy with its chord mass at 31% it needs to be 25% in order to spin safely. This is partly why I changed the design but the balancing procedure is the same.
Sheet size?
For gyrocopter blade chord is matter? For gyrobee having 210mm chord and 11ft long blade(per blade) but I have 178mm chord and 12.2ft long (per blade) is it ok to use ? Or chord and all to be match?
I'm not sure if I can answer your question but I need more information.
Please explain in more detail what you are asking. You have a gyrobee gyrocopter and want to know if a 178mm chord and 12.2 ft long blade will work ?
@@Ben-Dixey yes exactly! It’s a project for us so we just making gyrobee but unfortunately the blade size is 178 mm -12.2ft is available in china to purchase , they telling it’s fine to use ….most of home made Chinese gyrocopters were using this type of blade, but am not confident on that
@@mohamedshafeelmohamedbilal6364
Have a read of this forum thread. They discuss different blades on the gyro bee.
www.rotaryforum.com/threads/gyrobee-blades.9720/
I expect the 178mm and 12.2ft long blades will work but it will have certain flight characteristics. Best to ask on the forum for more details.
I'm a senior researcher at Heimkeeper Co., Ltd.
Our company has an idea to reduce propeller noise and vibration of helicopters and drones.We're done with the experiment.We have applied for a utility model and a patent As a result of several experiments with small propellers, the current noise and vibration reduction effect is about 30%. Looking forward good news from you soon
Interesting, with the reduction in noise and vibration was the efficiency of thrust affected ?
I haven't actually tested it, but theoretically, I don't think it will be affected by thrust.
do you use radiator on your engine sir?
Hi, yes there will be a radiator and belt driven fan for cooling but for testing purposes I just have a water reservoir and electric pump.
I knew there was a lot to setting up blades. But not the specifics. Thank You
You're welcome I'm still learning too 👍
Excellent video Ben. I noticed my body heat would make a blade rise when standing underneath. 🙂
Thanks for the inspiration Cam, it's because of people like you that I've got this far. Hope you're still tinkering. Interesting comment on the blade rising. 😀
glad to see the progress of your prototype mate. 👏👏👏
Thank you 👍
Top Video and very helpful in the process of building a helicopter... Thanks Ben
Thanks 👍
You will be balancing your rotor any time soon. As you have lead/lag adjustment you will be able to get the chord mass in the centre. Then it will come down to how accurate the machining was on the rotor hubs. Looking forward to your next few videos and seeing how you tackle it.
How many long propeller Your helicopter sir
Rotor diameter is 4.3m, each blade is 2m long.
@@Ben-Dixey
Thank you sir
sir are you using airfoil 23012?
Hi, it's 0012
Can you guide me ?
How the CG and aerodynamic Center of rotor blade algin to the rotor head ?.
@@prash007more Sure, looking at the rotor from above the CG of the blades should pass through the centre of the rotor head. Looking from the side the CG of the blades should pass through the teeter bolt when in flight. This is how you determine the rotor undersling. You use trigonometry to work out the blade coning angle, to find how much the blades will flex up or cone you need the centrifugal force and the maximum take off weight. These are the two sides of the triangle the it's just trigonometry to find the angle. From watching this video you can work out where the CG of the blade is and then the height of the undersling. Hope this makes sense, but message back if it's still not clear.
@@Ben-Dixey thank you..
@@prash007more I like your lifting crane, brilliant 👍
Absolutely a good design of blade.
Well it has its merits, but there are better designs. The new mosquito blades are the design to strive for in my opinion. Got to get that chord mass at 25%.
I really like your water tube setup.
Thanks. A friend of mine said about doing it that way but was probably first done by the Romans. Not for rotor blades of course but other levelling jobs. 😉
Hi, Are you using this blade and this hub in your flying machine at the moment. I believe you have changed to the blade and you are currently using the one which has a solid D spar, the one that has a 4.75inch chord and a different rotor hub. Please correct me if I'm wrong
Hi, yes that is correct, the blades and hub in this video were not used. I just used them for the balancing demo.
The CG location of the blade with blade straps and balancing was done in the same way on the new blade sets.
Good work.
What happens when an engine shuts down in flight? Can you do an autorotation?
Hi, no autorotation is possible and at the height I'm operating autorotation wouldn't be much of an advantage as it takes 50-75ft to transition from powered flight to auto.
the placement of your inclinometer MIGHT be adding to the real balance point, Just a thing to consider.
@@alexalvarez2495 yes that's something to be aware of. The inclinometer needs to be placed at its balance point to. I assumed the balance point was in the middle of the inclinometer but I didn't check that.👍
@@Ben-Dixey Hope it helps. Such a great job!
I'm wanting to make one a little smaller but use it like a gyrocopter but without a cart just with an engine for the engine on the back run to take off without a cart just the propeller and the engine for the engine
I saw no ground resonance so I would say you got the balance pretty darn good. Going to have to build a collective pitch bird next.
Thank you, yes collective would be better I think, if I had twin engines as well that would be even safer. Ground resonance I believe can only happen with more than two blades on the same hub. Dont think it can happen on a coaxial with twin teetering rotors.
very cool.. Man theres not much left to do on this machine , But I know its all the finishing touches that take ages.
Yeah, everything takes ages, but the next test and video will be exciting (for me at least). I'll put on a head cam so you can see what I see. Will be so pleased if it can demonstrate the required lift.
Everything has a cycles to failure index. I would have to wonder at what time these blades will have to be replaced. A rather critical component of a helicopter that we would never want to come apart when in motion.
Hi, yes determining the service life of a component is difficult. These particular blades weren't used as I made some much lighter ones. The new blades have a spar with a cross sectional area which will take the centrifugal loads at the materials fatigue strength. Parts built to this strength will not have a limited service life. However that's only centrifugal loads where actually there are other load factors like twisting and blade bending. These would reduce the life. Perhaps the only way to find out some numbers is to have a mechanical jig for testing blades running 24/7. This of course is very expensive research and beyond my means.
This is my first video I have seen of yours. I love anything Planes & helicopters. I learned something & Thanks!
Thanks for the comment 👍
Thank you so much for the great video
am wonder how this can control yaw
Yaw controls will be through directional vanes on the tail using the rotor downwash. check out this ua-cam.com/video/B21Xk6tNcBw/v-deo.html
thanks to you and ur gpod intention of making people smarter
Always thought directional control on coaxial is achieved by varying blades speeds...?!..or vanes is an alternative way of doing it
@@JeffChoppah altering blade speed for yaw is an interesting idea, I've heard of using a differential for driving the rotors and braking one rotor to achieve yaw but the craft would also reduce in lift which wouldn't be ideal. In a variable pitch coaxial you can increase the pitch on one rotor and decrease it on the other that would produce yaw but keep the lift the same. The tail fins on the Nolan helicopter seemed to work well and it's definitely the simplest solution. Time will tell if it's the right decision.
Wow, that was totally new to me 👍
I thin in beginning you said your not an engineer but you work is wow. Thanks for the video
Thank you 😊
Why 25 % is your target?
25% is where the centre of pressure is located on a naca 0012 aerofoil. If the balance is not at 25% then forces will be present in the collective stick. Weight either side of 25% will cause the blade to want to go to 0 pitch.
Very helpful.Thanks
This is my first video i canot see
Never before everafter what miracle of mfd of flight wings of
Home made helicopter what a wonderful job 👍👍👍👍👍
Thank you very much 🙂
Did you machine your own reduction unit cogs or buy them I've been looking into buying or have someone machine one for a 1980 yamaha exciter 443 motor I bought for ultralight project
Initially I had the synchronous belt pulleys made as toothed blanks and I machined the spokes to make them as light as possible but when I changed the ratios I made the drive pulley from scratch. I made a fly cutter for the milling machine using Hss tool steel ground to shape by hand but using a profile projector to get the contour accurate. This video shows a bit more.
ua-cam.com/video/yUd9Vg9V0qI/v-deo.html
what sort of ultralight project have you got in mind ?
@@Ben-Dixey something along the lines of an affordaplane or legal eagle maybe even airbike basically want it to fly like a cub
@@chrisknasel23 sounds fun 👍
Sir can you please send me rotar design pdf or do have on your website?
Hi, I can't share my drawings in case there is something wrong with my design. When it's been proven for hundreds of hours then I would consider it. I wouldn't want anybody copying any potential mistakes.
What the price of this helicopter please reply.
Hi, it has cost £6000 in materials to build.
You’re not an aircraft engineer? Could’ve fooled me! 👍
Hi dear friend
This was the center of Mass.
Where is the center of aerodynamic pressure?
Hi, the center of pressure of a 0012 blade (also called the aerodynamic center) is 25% chord, this is why the center of mass of the blade also needs to be 25% chord.
@@Ben-Dixey thank you
Excelent.... thanks for Share.
👍
Good Job MAN .......Ps. All THE BET FOR YOU
Thank you 😊
@@Ben-Dixey.....:) ....knowledge is power ....
Hi there, I was wondering if the big bold in the middle of the rotors that sticks out quite a bit doesn't affect the balancing off the rotors? Or is this identical to how the rotors will be installed to the helicopter?
Great videos by the way really enjoying them!
Hi and thanks, yes the bolt needs to be balanced in its position. I didn't use this rotorhead in favour of a different design, the new design has studs which are the same length and the same nuts both sides. It's just like balancing a wheel where all positions in a 360 circle must have the same mass from the centre of rotation. Where you can't add weight the centre position needs to be altered with shims instead. A out of balance centre bolt will affect the shimed position.
🔴 What Is Islam?
🔴 Islam is not just another religion.
🔵 It is the same message preached by Moses, Jesus and Abraham.
🔴 Islam literally means ‘submission to God’ and it teaches us to have a direct relationship with God.
🔵 It reminds us that since God created us, no one should be worshipped except God alone.
🔴 It also teaches that God is nothing like a human being or like anything that we can imagine.
🌍 The concept of God is summarized in the Quran as:
📖 { “Say, He is God, the One. God, the Absolute. He does not give birth, nor was He born, and there is nothing like Him.”} (Quran 112:1-4) 📚
🔴 Becoming a Muslim is not turning your back to Jesus.
🔵 Rather it’s going back to the original teachings of Jesus and obeying him.
Yes goods keren kreatip buat helikopter ?
Дай Бог тебе Здоровья, мира и добра! Я искал как делать лопасти!
Thanks so much for the comment. I like to help if I can.
You are the best. Very practical experience you shared thanks🌹.
Thanks for the comment. hope it helps 👍👍
Good video I like this my first time
My most of doubts get cleared by this video regarding rotor blade balancing.. it's really informative. keep sharing..
How u design n calculated the rotor blade strength? Do u have any design calculation to share? if u don't mind.
How u chose the blade length, cord, air profile, also the main spar, material of the blade.. n all these things..?
Hi, thanks for the comment, I've been thinking about doing a rotor strength video, there are a bunch of calculations i did to determine such things as rotor hub thickness, blade strap thickness, rotor spar strength, bolt shear strength ect. I can only determine these values in a basic calculation and you could go much further than I did using cad and stress analysis. I'm no expert but could share my basic understanding.
@@Ben-Dixey thanks
Usually rotors are balanced with out the Blade grip been attach,,remember to add tip weights
The Gyrotor instructions for blade chord balance said to have the blade straps and blade retaining bolts in place, this makes sense to me but I am happy to be persuaded otherwise. Tip weights is something I would definitely consider. Thanks for the comment.
How much should be tip weight need to add?. Is there any standard calculations?
@@prash007more I believe tip weights are sometimes added to reduce cyclic control sensitivity. They are sometimes used on gyrocopters and helicopters. I don't know if they will be necessary on my coaxial, I won't know until I try it. I'm hoping they won't be needed as it changes the centrifugal forces on the blade and the coning angles.
Great info! Thanks for sharing it
It must balance at the aerodynamic center and the center of the mounting must be in the same position.
That's correct, it must balance at the aerodynamic centre and I would agree that mounting the blade at this location is sensible. However I don't think Robinson mount the blade here, they are mounted further back and there is a benefit to doing this. It was explained to me but I can't remember the reason now.
very old rare lathe :)
do you plan to install rounded ends on the blades ?
this will reduce the resistance to rotation at operating speeds of rotation
Yes. Love my old lathe, I found it for sale 1/2 a mile down the road and paid £200 for it. I put on a digital read out and a digital phase inverter. It will probably last a lot longer even having been built in the 50/60s. These blades aren't going to be used, I just used these for the balancing demo, the blades on the helicopter have inserts in the ends to prevent centrifugal air pumping which will drag the blades by a few hp. Rounded ends I'm sure would be even better but don't know by how much.
Merhabalar ben. 30 kilogram kendi ağırlığında helikopter yapmayı düşünüyorum bunun için nasıl bir pervane ölçüsü çıkarmam lazım ( uzunluk .kalınlık ve en) olarak
That is a huge question to answer and I can't answer it. There is guidance on rotor blade size if you look up disc loading, solidity ratios, and aspect ratios. But ultimately what I did was copy what someone else had done. If you can find an example of a 30kg helicopter and its rotor dimensions that is. 30 kg is very light are you making a model ?
Gracias mil
You're welcome 👍
This great illustration buddy. Makes life easy...2questions for now...stage 2 balancing with m6 washers is that same as what they do with blade tracking? Then last stage balancing with that thin bar, is that necessary for blades supported with a bolt or all blades need that, eg the rotor head of this model am building doesn't seem like would be off on that, since it's holding pin on rotor head runs at center of the rotor shaft.
Thanks Jeff, tracking is done by spinning the rotor blades at flight rpm with some pitch but not enough to take off, adjustments are made on individual blade pitch so that they rotate in the same plane. I haven't done any tracking yet but I need to do it next test. Every rotor needs to spin on its centre of mass just like a wheel needs to spin on its centre of mass. When a car wheel is balanced you add weight to one section of the wheel this is because you can't change the wheels centre bolting point. With a rotor we can add weight like a wheel to the blade tips as a little weight makes a big difference over the length of the blade but much more weight would be needed to balance in the chord direction. Instead the rotor is shifted from its normal axis with shims. Alternatively you can lead or lag a blade in order to change its chord-wise mass distribution. No matter how accurate your blade retaining bolt holes are there will be a slight deviation at the blade tip to where it needs to be to balance. I'm not sure if the furia plans have included teeter hinge shims but it would be good to include them so you can get that rotor spinning with minimal vibration.
@@Ben-Dixey I see later on realised actually tracking is all about connecting rods and blade flaps adjustments...while what you did was rotor balancing itself...it's a good illustration will sure borrow some tips when my time comes...seems for my case I will need to dismount the entire rotor head and balance it with blades since they can't be dismounted seperately as your case....the easiest way for me with blades is using tubes and bars as shown in the plans...did one pic post with a prototype trying to figure out tube sizes...
Hello Ben, well been a while, just a quick one. Currently balancing my blades, and according to your video the washers are placed at the tip, I watched another RC blade balancing video and the guy says the weight should be added at the COG of the blade, as adding anywhere else offsets the individual blade initial COG....does that make sense?
Cheers.
Im afraid of helicopters, they are of the most unsafe aircraft, so it really takes guts to want to make one form scratch, even balancing the blades like in the video can end up in death, if the rotor gets into an unstable oscillation one of the blades can snap and hit you. There is a video of a young guy who was about to do its maiden flight, one of the tail rotor blades broke and hit one of the main rotor blades making them violently shake the helicopter almost ejecting him (he didn't had seat belt on), unfortunately the blade snapped at the right moment as to hit him in the head. I write this not as discouraging or being a bummer but more as a reminder that Is better to be extra careful and never take shortcuts when dealing with such things.
I agree with you, it's a conversation I've had many times with people and assessing the risks is difficult. I believe Munna was unlucky but had he been wearing a seat belt or a helmet I think things would have been different. I also would ask did he do the centrifugal force calculations on the tail rotor, did he use materials of known specification, did he run the tail rotor at higher rpm to check the strength under guarded conditions ? These would all be measures to try and avoid a rotor separation. I have done these things but I know full well there are other parts that could fail and you can't remove all the risks. I have gone back and fourth in my thoughts on whether or not to play with a homebuilt helicopter.
Very useful information I didnt find from other homebuilt helicopter channels. Is there a follow up?
You earned a subscriber BTW
Thank you. A follow up to blade balancing ? For me the process in the video worked and I haven't had to do any further work on balancing. Dynamic balancing would probably be the next step or perhaps fine tuning the method of chord wise rotor balancing.
@@Ben-Dixey All right then. 👍
Again very well explained , and really proper balancing of rotor blades is the secret of your successful spinning test in final video (I had problem of vibrations in propeller of para motor ,I did the same to get the propeller balanced ) ,this is why your rotors were spinning so stable without vibrations . Great job 👍
I wasn't sure that you are not going to use power line to change the pitch of blades in contra rotor system ?!
Do you just just have to depend on high RPM for getting airlift ?
I shred your video to my friend in hobby aviations .
Thnx
Thank you. Yes that's correct the blades are fixed in pitch and engine rpm is used to control lift. It's not as precise as using what's called collective pitch but it's still effective. Have a look at the Nolan helicopter this is where the inspiration came from.,
m.ua-cam.com/video/B21Xk6tNcBw/v-deo.html
@@Ben-Dixey actually even with fixed pitch it's looked quite controled and stable ..
But you can change the position of rotors on their Axis ? To get the cyclic control ?
@@rajeevshagun7409 yes, you have got it. It keeps things simple and lightweight but there is a drawback which is control. With cyclic pitch control using a swash plate it's very sensitive and responsive. With a tilting mast there will likely be a time delay between control inputs and response. I will have to learn to compensate for this but as the Nolan helicopter demonstrates it's very controllable once you have mastered it. I will soon find out what it responds like as I'm getting ready for the next test.
@@Ben-Dixey oh my best wishes are with you ... Don't need to remind you the safety procedures , because you are well aware .
The good part of contra rotors is , it has very little chance to get wild spinning due to anti torque rotors failure .
Almost no chance .
I have seen wild vibrations in main rotors in new copters .
But your stuff is balanced blades we can trust it .
I wish I would be around you that time .
@@rajeevshagun7409 Thanks for the encouragement. I will be recording the final testing procedures and then 🤞learning to fly it so everyone can experience it with me. 👍
Sensacional 👏🏼
درود به شرفت آفرین مرد بزرگ👏
Thank you 👍
👍 👍 👍 👍 👍 👍 👍 👍
Very interesting stuff 👌
Good trails
What black magic is this.? 🤣 well done
😆thank you.