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@@EnglishTurbines I use to have a versa wing and loved it. A great little wing and easy to build. That is a fantastic flight time and must be a lot of fun to fly fpv. The Speedy bees are a great little flight controller and cheap as chips…..Rotor Flex👍

Thanks for the inspiring comment, it’s definitely nice that you noticed the edited in my videos as there is a bit of work and planning timing the videos around the music. Daft punk is one of my old time favourites for sure. Hopefully people can see the joys and bonus of slope soaring in the video and help bring back this RC dying type of hobby. I intend to build an fpv version of this wing to try soaring from an fpv perspective with an onboard flight controller and osd to help find lift….. Rotorflex👍

@@MrMadmac38 thanks buddy, much appreciated. It’s been a fun build and still is as I’ll keep pushing until it makes the 200mph mark. The last comment had me wetting myself for a short period of time 😂😂

@@mauritz1774 well done and well spotted as you are the first to ask. I have added two 1mm carbon fiber fins on the bottom to allow a hand hold area without adding extra drag. Thanks for the comment…..Rotorflex👍

@@mauritz1774 yes I’ve also seen it. Very inefficient setup as he is double the voltage and only making an extra 14mph. I intend to break his record using only 6s……Rotorflex👍

@@OMEGOOLIEBIRD an FPV speed legend is always welcome to fly with us! I have been a fan of your videos for many years but I think you are in the Mainland and we are in Northern Ireland. You are welcome anytime so if you are in NI drop me a message and come fly buddy. My latest achievement with the Dolphin maxed out at 176mph still with a quad motor in my latest video. I will have to move to an inrunner to beat it but I’m keen to push the airframe to 200mph. The comment is much appreciated and I hope to see you at our field👍

Thanks man, hopefully when my new motor arrives I can break the 200mph mark….Rotorflex

Thanks man, the Goblins are a fantastic airframe and you will have a lot of fun with it. I’ll be sure to try the prop you mentioned on my next speed run. I have ordered a new motor with the hope of breaking the 200mph so keep an eye out for a further video to come……Rotorflex👍

Agreed, going for a motor upgrade and we will hopefully break the record on a level run. Cheers……Rotorflex👍

Thanks man, this is one of my local fly sites and by far my favourite 👍

Yes my friend, was a super day with plenty of lift 👍

Thanks you buddy, you should book yourself in with a flight school to give it ago or maybe try a tandem flight👍

Tom, cheers buddy. Was an interesting build for sure.👍

@@sebastiantomczyk4577 on a custom build 6s 4500mah I can get around 25 minutes on this motor setup. A longer flight time would be achievable by a lower kv motor and larger prop. I have heard of some people achieving 45 minutes with a good motor setup….Rotorflex

@@torquedude thank you so much for this and other answers 😊😊😊 have a good time with this plane!

@@sebastiantomczyk4577 happy to help👍👍👍

Yes but how fast does it Go I have one with a custom set up that goes 206 miles an hour 😊

​@warbirdflyerF4U what motors are you using?

@@sebastiantomczyk4577 good question. There is a lot of controversy around this subject what is better but in general here is a few differences between the two. A tractor prop receives clean air with no turbulence from the fuselage body. It allows the control surfaces to be active at low speeds as the prop is forcing air over them making the plane easier to control at low speeds on takeoff. A pusher prop plane is harder to launch as the control surfaces are 100% reliant on airspeed as the prop isn’t forcing any air over them. Pushers are noisy due to being fed by turbulent air passing over the fuselage. A plus with a pusher is the wash is less turbulent therefore creating less drag. Depending on the type of air frame a pusher can help achieve the centre of gravity by adding weight to the rear of the plane. There is many more pros and cons to these setups but that would be the main points I recon…..Rotorflex👍

@@torquedude these are correct, but what about plane maneuverability in the air. Is pusher plane as good as its counterpart puller when it comes to maneuvering?

@@sebastiantomczyk4577 tractor wins hands down due to the air from the prop being forced over the control surfaces. That’s why all 3D planes are tractor and not pusher……Rotorflex👍

@@warbirdflyerF4U brilliant, thanks for posting as most aren’t aware of such an equation. You can also use the online mr D prop calculator, I use it for all my speed setups for the theoretical top speed of the motor prop setup inline with the inputted voltage ( battery ). Again thanks for posting and feel free to share your knowledge with others as this is the true hobbyist spirit…. Rotorflex👍👍👍

I thought pitch speed was simply propeller speed for a given RPM. Isn't that what you provided a speed estimate for a given motor, prop, battery, airframe combination?

@@Andy-df5fj yes but the one thing you can’t calculate for is the airframe drag. The calculation is also theoretical and doesn’t allow for real world such as air density/pressure. It gets you close if you are wanting to attempt a given speed. That’s why I cleaned the airframe up as much as I could to reduce as much drag as possible but unfortunately it wasn’t enough. My next move is a different motor and prop combo. Hopefully I can break the 200mph mark next run……Rotorflex👍

@@torquedude Exactly right that is why I provided a theoretical drag coefficient

@@Andy-df5fj We are calculating pitch to miles an hour Not pitch speed Which is more of propeller tip speed calculation

@@warbirdflyerF4U that’s awesome. Good to hear that there is still some knowledgeable modellers out there who understand that a smaller prop and more pitch means more speed. A lot of people on UA-cam think a larger prop is the answer when it’s not. Cutting down the prop is something I use to do in my old nitro days, I must give it ago and see if I can gain a little more speed with the pitch aggression. Again thanks for the comments and check out my latest speed run videos. I’m about to head out to attempt a 200mph run so wish me luck buddy…..Rotorflex👍

@@warbirdflyerF4U that’s awesome, you must be using an In runner motor to achieve those speeds? Upload your videos as they will do extremely well on UA-cam buddy. Thanks for the comment and look forward to the footage…..Rotorflex👍

@@The_regular couldn’t agree more. Unfortunately the rest of the Dolphin community are claiming their top speed run numbers by recording max speed in a near vertical dive like the 12s Dolphin and Jeff’s latest run. Only way to compete fairly is to do the same. The other airframes can’t sustain any kind of high speed passes when on the level unlike mine. It would be better to do a horizontal plus vertical speed run to get a better comparison of power and aerodynamics. Thanks for the comment and the 🐓 emoji definitely gave me a laugh. Cheers……Rotorflex👍

@@torquedude I think after my drak died I want to build a speed dolphin, I used to have one when they first came out it’s a great airframe! I could get mine over 120MPH on 4S with a badass 2320 1800KV

@@The_regular awesome buddy, a 4s dolphin is definitely capable of high speeds with the correct setup. If you are building a new dolphin check out my latest video as I made a lot of aerodynamic modifications and improvements that will help with top speed and flight time. If you have any questions about the mods just drop me a comment and I’ll be happy to help……Rotorflex👍

@@scottyh72 the horizontal run was in horizon mode and the dive was in acro mode. I carried out a lot of testing in acro mode as horizon can mask a lot of issues, I believe that’s why my older versions crashed due to rolling on their own at high speed. Thanks for the comment buddy…..Rotorflex👍

@@torquedude Horizon is scary af. I fly acro only, even vtol. Inav puts I term in the levelling loop, that doesn't work. They need to run more I term in acro so all the accel needs is a set point, but Darren thinks acro is manual with some P term. Dumb.

@@scottyh72 interesting. I must admit that I have gotten lazy over the years with fixed wing and find myself using horizon more often but will fly quads acro only. Thanks for the info and I’ll stick to acro from now on with fixed wings. A lot has definitely changed regarding Fc tuning. I use to help out on the open pilot project many years ago but I have honestly lost touch with all the filters that have been added. Again thanks for your help……Rotorflex👍

@@dronepilot260rc thanks, it’s a work in progress. Hoping to achieve the 200mph mark with this one👍

@@sebastiantomczyk4577 a Shim is used to space or align, it can be many different shapes and sizes to suit the desired outcome. I made my own Shim to correct the motor mount angle so the motor thrust is inline with the wing cord. The Shim was made from ply wood. Hope that helps and that’s for the comment……Rotorflex👍

@@torquedude do I see correctly, did you mount that shim with some angle? I guess thats for compensaton of the initial angle that prop was installed. But why the producer included in its design this angle?

@@sebastiantomczyk4577 great question. Atomrc has designed the dolphin to fly at low and mid speeds ( 15 to 100mph ). On the original design the combination of motor up thrust, downward facing winglets and tapered tail fins allow the dolphin to be very stable at low speeds. I had to remove these features to achieve the high speeds on 6s but at a cost. My dolphin is no longer stable at low speeds so I have to land a little faster than normal. Atomrc have definitely done a great job with their design but I want to see how far I can push this airframe…..Rotorflex

@@torquedude wow, thats great.

@@sebastiantomczyk4577 thanks for the comment and happy to help and explain the modifications……..Rotorflex👍

@@dronepilot260rc I would love a Strix Goblin in my fleet for sure. It’s one of those planes that will do everything well. Thanks for the comment buddy…..Rotorflex👍

@EnglishTurbines, During the flight i thought all was well until i was editing the video and seen the occupations at max speed. The wings have been shortened to reduce the leaver affect plus drag, the laminate is extremely strong making the wings very stiff but part of me now wishes i had glasses them to remove all doubt. The main thing is that i still have full control at high speed and no unwanted rolling is occurring. I am using a 5x5 speed prop at the moment with a 2200kv motor, A larger prop is an interesting concept to me and believe me your not the first to suggest this on youtube but it has always went against what i have been taught and learned from my fast nitro days. The theory i was taught was a smaller prop will allow the engine to rev out in the air and not act as an airbrake (windmilling) when the engine is getting close to its peak rpm allowing a little more extra top end speed and performs better in a dive that a larger prop. I am definitely willing to give the larger prop ago as you have suggested so i will match it with a lower kv motor to stop me melting another one. Some gliders definitely go faster, i have quite a few models that will outperform this dolphin but i want to keep pushing this little PNP foamy to see what i can get out of it for giggles 🤭. Thanks for your comment and the suggestions. I will let you know how i get on with trying a larger prop..... Rotorflex 👍🏼

Just need a variable pitch/constant speed prop 😋

@@MatyasArby a variable pitch prop would definitely be the answer. Thanks for the comment buddy…..Rotorflex👍

X2 of what he said. I’ve been toying around with fiberglass and epoxy and it’s definitely worth the little added weight

@@dronepilot260rc for sure, I use to glass some of my older models and the strength benefits are brilliant. Thanks for the comments dronepilot…..Rotorflex👍

@@EnglishTurbines she certainly was singing. The build and test flights including the osd footage are all in the main video….Rotorflex👍

How's it going buddy did you get to make another test flight and try to hit 200 😊

@@warbirdflyerF4U Yes I got a few speed runs in but only managed another 2mph by playing around with props. I have a few different motors to try next, keep the fingers crossed that I break the 200mph mark next test flight….Rotorflex👍

@@torquedude Great job buddy can't wait to see your next video And good luck you'll get there just add pitch and cut diameter

@@irvine40 thanks, was a fun video to make….Rotorflex👍

@hsynneva, thanks buddy. The dremel is one of those tools that I wonder how i survived without it…Rotorflex👍

Stay down.normal5323, trust me you haven’t seen diving yet. Artificial horizon still in the osd. A nose down dive or a 45 degree drive the osd will go off screen on inav. You’re more than welcome to join but we are playing with dolphins at the moment. I have hot liners and nitro aircraft that would make my dolphin look like it’s parked! It’s about the airframe and how far the airframe can be pushed. You should definitely build a dolphin and join in, the more the merrier…..Rotorflex👍

@@torquedude i just might its been a few months since I built a rig. I have too many but all are 4s from 600mm ,688mm,900mm,1.1m 7feet the opterra. I have a good motor prop combo I would like to put on one and a few tricks

@@staydown.normal5323 that would be cool buddy. I know the feeling having to many rigs but we only live once so definitely go for it. I have just finished building my version 3 dolphin and will be attempting to break the 190mph mark. Wish me luck and keep an eye out for the video coming soon of the build and top speed runs. If you need any info on my dolphin mods just let me know, would be happy to help another speed enthusiast out……cheers, Rotorflex👍

I’m currently using the DJI googles V2 so I can record OSD values. Thanks for your comment…Rotorflex👍

That’s Ireland for you😂

EnglishTurbines, yes was a smashing day and a good mixture of models in the air. Chase scenes using quads is a nightmare and normally ends in exchanging some paint between models. Cheers for the comment….Rotorflex👍

With my 5000mah battery pack I can get about 20/25 mins depending on how I fly. I have seen some people double up on battery packs and getting around 40 mins

MrBEEFCAKE26, thanks for the comment. If you enjoyed that wait until you see my newest video coming shortly with my much faster version 3 build of the dolphin. Here’s a link to the LEDs I’ve used in my builds betafpv.com/products/pavo-series-cob-led-strip . Cheers…..Rotorflex

Can't wait pal new sub, hear

@@MrBEEFCAKE26 your sub is much appreciated buddy. You haven’t long to wait to the new video, if the weather is flyable at the weekend you’ll hopefully see an awesome speed run!👍