The relative motion between the magnets and coils of a motor produce a voltage, thus causing it to act as a generator while running as a motor. This voltage is referred to as back-EMF. It is in series with and opposes the original applied voltage. When the motor reaches the rpm at which the two voltages cancel each other, it will not turn any faster. KV represents “RPM per Volt”. It’s determined by rotating the motor at a known rpm and measuring the voltage it puts out..
Thanks James! I may need to watch/listen a couple more times to really sink it all into this hard head of mine, BUT I'm thinking I understand it a little more now.
A great primer on electric brushless motors - Pro’s and Con’s. Maybe James you could do a more advanced video where you place motor on scale with different props and battery/etc to determine grams of thrust. Doing that helps find the right motor for weight of craft. I know you already did another video with the battery load meter-that was also a great video.
Any chance to get a video on flight maneuvers? Like how to perform roll with view of controller. Or how to fly inverted. I personally have a issue with it an just ripped front end of my turbo timber trying to pull it off
Great idea!. The key to inverted is proper CG. With proper CG, when you invert, you need very little down elevator (up on the stick) to stay level. And the beauty of inverted is that your ailerons are still left and right, so instead of pulling down on the stick and rolling right or left, you are just pushing up on the stick rolling right or left. Always practice 3-4 mistakes high
Hey James well done on another great video..My question is no hobby shop can answer is I've freewing f22 raptor 64mm 4s 12 blade and eflites f15 bnf 64mm splinter and both have flown approximately 20 x each and both now seem gutless on power and really struggle and don't take off anymore or hand launch just not strong enough power ...is motor or esc ? Or both...???? Also can I put 12 blade fan into a 11 blade factory set up or do I need to change kv on motor or up the esc amps or both ???? Cheers
That's odd it's happening to 2 planes. That would make my first thought of the battery. Is the LiPo old? Has it been taken care of properly (stored in storage mode and not fully charged, etc, etc). Secondly, you can always try to calibrate your esc (we have a video on how to do that in the Tips playlist on our main UA-cam page). Simple process. After that I am not sure and I'd recommend contacting our customer service by phone so someone can get the full story. you should be able to swap the fan but I doubt you'd notice any difference from 12 to 11 blades to make it worthwhile. a 3 blade to 2 blade is a much bigger change than 12 to 11.
@@MotionRC thanku for reply James. batteries are fine as I've a bunch and use weekly ...always test on battery tester b4 putting in plane.esc seems calibrated but will test again .and the extra blade I've noticed from 11 to 12 is the whoosh sound of it comparison wise only as for speed naaa just sound ... so I should be fine to just swap out any of my 11 blades to 12 blades with no hassle as I've fms hornet .eflite f15 and f22 freewing all 64mm ...my bigger jets are fine ...I just like the sound the raptor makes when It flew ...cheers James.
Potentially. But also more blades will produce more static thrust (better for larger EDFs) but will be slower and less efficient. Theres a balance between all parties at play
The best way to see if your CG is fine is: trim your plane to fly straight at half throttle, then climb high, cut throttle and dive at 45 degres angle et watch the reaction : if it climbs on its own it’s nose heavy, if it continues to dive it’s neutral (what we often want) and if it dive even more it’s not good you’re tail heavy!
@@ignaciovera8107 just ask the community on Facebook group « Motionrc costumer community » it’s for which plane ??? But you can start the recommended CG from the book
@@alphamrc309 WOW! I've never heard of that plane. I googled it and that's an amazing looking plane. Don't rethink just add it with the big P-47 and Bearcat LOL.
I don't get it. Some people say on my edf that higher motor and kv makes is higher performance and makes my jet faster. Some say lower kv makes the plane faster. Now I'm more confused. Omg. !!!
Perfectly clear and simple James, nice explanation 👊🏻
This helped a lot more than most videos
I see that as an absolute win ;)
The relative motion between the magnets and coils of a motor produce a voltage, thus causing it to act as a generator while running as a motor. This voltage is referred to as back-EMF. It is in series with and opposes the original applied voltage. When the motor reaches the rpm at which the two voltages cancel each other, it will not turn any faster. KV represents “RPM per Volt”. It’s determined by rotating the motor at a known rpm and measuring the voltage it puts out..
A good clear explanation of kv.
This series is great! ✅✅
Any ideas for more vids are always welcome! Thanks for watching
Thanks James! I may need to watch/listen a couple more times to really sink it all into this hard head of mine, BUT I'm thinking I understand it a little more now.
A great primer on electric brushless motors - Pro’s and Con’s. Maybe James you could do a more advanced video where you place motor on scale with different props and battery/etc to determine grams of thrust. Doing that helps find the right motor for weight of craft. I know you already did another video with the battery load meter-that was also a great video.
Good idea. It's on the list!
Excellent video buddy, enjoy these quick tips, thanks for sharing 👊🏼👊🏼
Good stuff James. 👍
Thanks AirHammer! Where you been?
@@MotionRC busy here lately. Trying to get caught up with MotionRC and all(to many) my subs. Thanks James. AH out!!
Great video James love it.
Good tip. Thanks James.
You bet!
I need more KV!
Another great tip James, always helps me these tips 👍🏻
Thanks James, I still get a little intimidated or confused when it comes to this, but it was a big help.
The first number is sometimes the dimensions of the can and on other motors, it’s the dimensions of the stator (coils inside the can)..
true. Within a brand then, you can guage the size relative to others
Man your the best.
much appreciated man. I try
Great video
Thanks for the visit
Any chance to get a video on flight maneuvers? Like how to perform roll with view of controller. Or how to fly inverted. I personally have a issue with it an just ripped front end of my turbo timber trying to pull it off
Great idea!. The key to inverted is proper CG. With proper CG, when you invert, you need very little down elevator (up on the stick) to stay level. And the beauty of inverted is that your ailerons are still left and right, so instead of pulling down on the stick and rolling right or left, you are just pushing up on the stick rolling right or left. Always practice 3-4 mistakes high
Hey James well done on another great video..My question is no hobby shop can answer is I've freewing f22 raptor 64mm 4s 12 blade and eflites f15 bnf 64mm splinter and both have flown approximately 20 x each and both now seem gutless on power and really struggle and don't take off anymore or hand launch just not strong enough power ...is motor or esc ? Or both...????
Also can I put 12 blade fan into a 11 blade factory set up or do I need to change kv on motor or up the esc amps or both ????
Cheers
That's odd it's happening to 2 planes. That would make my first thought of the battery. Is the LiPo old? Has it been taken care of properly (stored in storage mode and not fully charged, etc, etc).
Secondly, you can always try to calibrate your esc (we have a video on how to do that in the Tips playlist on our main UA-cam page). Simple process.
After that I am not sure and I'd recommend contacting our customer service by phone so someone can get the full story.
you should be able to swap the fan but I doubt you'd notice any difference from 12 to 11 blades to make it worthwhile. a 3 blade to 2 blade is a much bigger change than 12 to 11.
@@MotionRC thanku for reply James. batteries are fine as I've a bunch and use weekly ...always test on battery tester b4 putting in plane.esc seems calibrated but will test again .and the extra blade I've noticed from 11 to 12 is the whoosh sound of it comparison wise only as for speed naaa just sound ... so I should be fine to just swap out any of my 11 blades to 12 blades with no hassle as I've fms hornet .eflite f15 and f22 freewing all 64mm ...my bigger jets are fine ...I just like the sound the raptor makes when It flew ...cheers James.
Nice Quick Tip Video James.... Now I Can Just Send The Nephew To Watch it instead Of Trying To Explain It Myself With the Wrong Terminology Thanks !
Happy Tuesday pilots, the F-104 decals are in the mail today excited 😀 to finish it!
Can't wait!
Great video, can you do one on surface motor for cars. Like what is the Turn rating on car motors?
Sounds like a plan!
Great video.
So in terms of edf’s would a higher KV so the same fan give more top speed and lower KV more thrust?
Potentially. But also more blades will produce more static thrust (better for larger EDFs) but will be slower and less efficient. Theres a balance between all parties at play
Hi, James :3! and BTW, How can I identify if the CG Is correct, could someone explain me pls?
The best way to see if your CG is fine is: trim your plane to fly straight at half throttle, then climb high, cut throttle and dive at 45 degres angle et watch the reaction : if it climbs on its own it’s nose heavy, if it continues to dive it’s neutral (what we often want) and if it dive even more it’s not good you’re tail heavy!
@@ArthurRC hmmm, ok, that's a nice solution, but is there any way of proving it without flying? I don't want to crash ;-;
@@ignaciovera8107 just ask the community on Facebook group « Motionrc costumer community » it’s for which plane ??? But you can start the recommended CG from the book
@@ArthurRC well, I don't have facebook and is for the F-35, in which I'm a bit confused
@@ignaciovera8107 start with book’s CG and try the dive method 🤓 but be prepared because she lands hot !
I would understand it better if Freewing designed and produced a B-1B (for demonstration purposes of course!)
For demonstration purposes, of course.
@@alphamrc309 Could better be explained in a 1600mm Flightline P-47(no bubble top please) or a 1600mm Flightline Bearcat.
@@twincitymoo7141 Oh, I thought a Moonbat would suffice, perhaps I should rethink per your suggestion
@@alphamrc309 WOW! I've never heard of that plane. I googled it and that's an amazing looking plane. Don't rethink just add it with the big P-47 and Bearcat LOL.
@@alphamrc309 hahahahaha, the Moonbat! Of course. Or a Goblin, just for all of the fun maiden flight videos we would get!
🎄
I don't get it. Some people say on my edf that higher motor and kv makes is higher performance and makes my jet faster. Some say lower kv makes the plane faster. Now I'm more confused. Omg. !!!
Soo....more Kv is for little rc,and low Kv is for big rc? Sorry but I'm still confused: :')
I understand electrics and know the advantages but my heart is still with nitro. I guess that's why they call me NitroWoman.
I bought my first nitro. Finally have everything to try and start it. Have a plane I'm building for it but not sure if it will work out