Variomatic Propeller FAQ - 340 comments! Smarter Pilot series.

[@SeanAllocca]

Miro, no one questions your abilities because you have proven yourself in the past with your mad engineering skills dude. All the best from Kremnica.

[@sillstars]

We need an electric scout as well, get another cardboard box and you can fit that project in! :) Great video Miro, keep them coming!

[@moose7472]

Your view on failure is the reason for your success.

[@JeffCurtisIflyHG]

Most pilots (at least GA pilots) are aware of the benefits of in flight adjustable props. Development started just after WWI and commercially viable implementations were available in the 30's, certainly in WWII the vast majority of military aircraft had in flight adjustable props. There is also already a company that makes props that are adjusted in a manner similar to what you have done for a small number of GA aircraft, so it shouldn't be a surprise to pilots in the know that what you have done, if implemented correctly, will have positive results. I don't intend for this to diminish in anyway all the hard work you put into making this a success. I say bravo and congratulations for sticking with it and making it work. I won't be surprised but will be pleased when the solution is eventually available to PPG pilots. Electric motors and motor drives are already very efficient. When not running at 100% output the current drawn is proportional to the load, if the prop doesn't load up the motor, the motor won't draw very much current. I wouldn't be surprised if there were no benefit for electric drives. Another way to look at it, electric vehicles don't select different gears in a gear box for different vehicle speeds, the motor to wheel gearing is fixed at one ratio and electric vehicles still have excellent acceleration and operate at high vehicle speeds.

[@warrenkral6562]

Thanks for all the 💡 innovation. !!!!

[@ryandinan]

Oh psych! I'm glad I watched to the very end! Miro, even though I do not fly a Scout, I find all your videos extremely educational and informative. I do hope you get this prop to work to your satisfaction, because it may very well be the future of paramotor props. I know you'll likely not make one for Nitros/Tornadoes, but I wish you success on this project!

[@drewbear82]

I'm confident that you will figure out how to make it perform the way that you want it to. The paramotor community totally has your back.

[@freezatron]

Well I for one applaud your efforts regarding your innovations and the honesty with which you present them. People who are afraid of failures rarely succeed !! I think the variomatic propeller is a brilliant idea and the benefits are going to be worth the effort of development. I do wonder if making the springs adjustable to suit different atmospheric conditions is worthy of consideration ? A simple set screw for each spring would do it..... maybe ... :)

[@evanspj1]

We appreciate your transparency.

[@RominaSosaSchnoerr]

Thanks for the answers! Great vídeo! Keep innovating ❤

[@tango_sierra8608]

Can’t wait for more videos. Love following these projects

[@brunodesousa3772]

Well done on the wingman challenge. Thanks for the update !

[@verticallines212]

Great Content, Take your time but hurry up! love it, NYC

[@cookncamp]

Thank you for progressing the support.

[@pimplequeen2]

Would be kind of funny if it turns out to be the springs failing :) Looking forward to seeing what failed, I am assuming some low-level resonance has worn something out.

[@mmcowan]

Hah hah…and the big cliffhanger at the end! I’m incredibly curious about your thoughts after your experiences on the Challenge have time to brew for a while…especially with air pressure.

[@stephenkeen6044]

I thought I saw the variomatic on your machine in Judson's latest video! :D I also initially thought a flexible prop would be the best way to achieve the same effect (with no moving parts), but you're spot on about prototyping and production, would have to iterate a number of times to get good data (make a bunch of prototypes) and very difficult to achieve consistency in production. Keep on going, you'll get it sorted, very cool project!

[@patrickmckowen2999]

I'm a believer 👍

[@apsestasis]

to be fair, you don't need to use one helical spring - you can use one leaf spring for both blades. that shouldn't complicate things too much. It could be used as a pusher or a puller spring, and having one spring instead of two would minimize the issues with having slightly different tension for each blade.

[@SCOUTaviation]

I can see some benefits of leaf spring. This would require significant changes in the design. For simplicity in will stick with current design for now but I will consider leaf spring for future evolution.

[@JudsonGraham]

Miss you my dude!!

[@Irresponsibleful]

I need this for polini 202 !

[@adibabi]

Are you planning to produce a 140 in the fullness of time?

[@mcgyver512]

Awesome!

[@ripmanridin7092]

Good stuff..................new sub!

[@marximobraga]

Miro, would the propeller work better on a Moster Factory or Standard? And at which ratio 2.87 or 2.68?

[@unclebuck8558]

Miro, why not use a swashplate like a helicopter to vary pitch inflight ?? Pilot adjustable in flight ! I’ve used this process on model aircraft for reverse thrust to fly backwards

[@SCOUTaviation]

How would that be better?

[@unclebuck8558]

@@SCOUTaviation It would allow infinite adjustment you could measure with rpm and speed to ensure optimum performance - blade shape can be optimised. Have a look at a Rc model helicopter tail rotor- upscale it It could be retro fitted to not just scouts but all prop hubs for all engines

[@unclebuck8558]

@@SCOUTaviation I bought a scout nxt from Steve page in the UK it’s in the air almost here I’m super excited for my first scout

[@pimplequeen2]

@@unclebuck8558 I often mull on this one for a Sub70kg and it usually ends with "I can't afford the extra weight"... I'm sure it could be done with NASA style attention to detail and tech but for me, my workshop and fear of resonance/fatigue, it would take some doing.

[@scaviator4207]

Would attaching “Q-Tip” prop blades be a benefit in increasing efficiency and reducing noise?

[@sunny_froyo]

electric motors aren't more efficient at lower rpms, but it takes a lot less amps to keep the motor at 50%rpm than it is to keep it at 80%rpm so yes the electrics would benefit from this.

[@LukasKuhelj]

added bonus: less noise from the prop because of the lower rpm!

[@turkeyphant]

PLEASE make this for the Atom 80!

[@GolfFoxtrot22]

Great news. I fly a PeaBee flexwing (powered hang glider) with a Moster 185 and have struggled for ages to find a suitable propeller as my cruise at 57/5800rpm is 46 mph. Do you feel your propeller will be suitable for these flying speeds? I'd be really interested in supporting you if required. Your R&D and attention to detail is amazing, thank you. Looking forward to the update.

[@SCOUTaviation]

I am sure it would work. I will not be able to fine tune the settings. Would you?

[@GolfFoxtrot22]

@@SCOUTaviation I work with a UK microlight maintenance company called Micro-Maintenance so would happily work on the fine tuning. I've even been experimenting with different pitch propellers at the moment.

[@wileycoyotentaz]

Will a version of this prop be made for the PAP 2.87 moster 185 drive?

[@davidyoung518]

Failure is always an option!

[@mamatuja]

Miro, It wasn't necessary to trash your propeller at the end of the video.😉

[@SCOUTaviation]

This one will be on the wall soon!

[@mamatuja]

What does a propeller have to do with different engines? Isn't it all about RPM?🤔

[@sunny_froyo]

that's like saying tire size doesn't matter on a car, it's all about wheel speed. different props provide different loads, which puts different stresses on the motor. you can overheat and kill a motor by running the wrong prop

[@mamatuja]

The price of this propeller will be: 2 carbon fiber blades + all the machined parts + all the parts of the shelf + 2 drops of oil before each flight.🤔🤞

[@mamatuja]

Hey Miro. How much fuel have you burned in that challenge flight compare to your partners? I bet same or more.🤔

[@SCOUTaviation]

Just recorded that video today. We need to wait few days for Matej to finish editing.

[@ruthdoyle9085]

Tucker Gott

[@JorgenEilertsen]

I dont believe this. ....................................................................... Just kidding. ;) I'll be ordering one.

[@mamatuja]

Variable propeller makes no sense for a long flight.🤔

[@paramotorhead]

As the propeller is designed to be more efficient at cruise by increasing the pitch at lower rpm’s I’d say your comment is the antithesis of the reality.

[@mamatuja]

All the propellers are designed to be most efficient at cruise speeds.🤔

[@pimplequeen2]

@@mamatuja Indeed, but usually, you can design for max static thrust (EG: short takeoff run, less efficiency at 30mph) or best cruse (EG: efficient at 30mph but lower max thrust for launch) Or somewhere in-between in a compromise. You can't have both without the complexities of some form of variable pitch.