Hi Miro, I love your videos they are always very insightful. You are doing an amazing job of R N D in Paramotor. Keep up the great work. 😊. Hopefully one day we share the sky together. 🪂🛩️
Out of curiosity, in the classical props any reason why winglets design for propeller was not studied in your experiments? Technically there is a considerable noise and drag reduction. Checkout eVTOL propeller designs.
have you considered a clutched (say) 2 meter diameter propeller along with a more regular size? The large propeller would be locked in the horizontal position during takeoff / landing, and the clutch would engage the larger prop at altitude.
@@turkeyphant two propellers. One clutched so that it does not spin during takeoff. You engage this while in the air (and potentially disengage the smaller one).
Hello, have you had a chance to try the propeller from the Polish manufacturer vetec smigla ? Many professional Pilots fly in competitions using vetec smigla propellers ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nL6P1VIbp4k.html
I've noticed it's very difficult to get accurate flight data for comparing different props, power systems, torque fins, etc., and their effects on efficiency. Even with the electric setup and the instant feedback in power consumption it provides, the weather variable makes getting useful data hard and confirming results that much harder, as there are only so many zero-wind days and even on the zero wing days with the sun set so there is seemingly no effect from thermals there is still a surprising amount of variability. I have found that day-to-day weather changes efficiency around 5-10%, and most changes in props and power systems, etc., only have around a 5% effect, so it can get lost in the noise. I've found myself on nice days testing something and getting a surprising result, then landing and running back to the shop to quickly swap out a part or grab a completely new setup with just the one variable different, and taking off again because at least the weather can't change too much in the 10 minutes between the two tests. So by the time the evening's over, I'll have 2 or 3 units out in the field that I have to take back to the shop. The point being, it's really hard to make the incremental changes of that 5% improvement here and there when weather changes make the noise floor so high.
I love to see what you tested/tried for our hobby and share with us all! Thank you so much!!! One question: Why not run full throttle at let's say 6800rpm instead of 8600? Same power, less rpm, less consumption, less heat, less stress on all parts?
I fly an e-prop 3 blade 155 cm at 2000/2100 rpm, with an old hirth engine. many times quieter than the Polini with 150 prop and the Cosmos with 160 prop
Miroslav, You just need to make the propeller rotate in the ring with minimal clearance, like an axial fan. That carbon frame design is the closest to success!
@@AndrewGlobus the motor is rubber mounted and oscillates far too much for the less than 5mm gap Miro states is necessary. The hoop would have to be mounted to the motor somehow.
@@AndrewGlobus I’m not saying otherwise. Just that it’s impossible to maintain the tight tolerance needed with the motor moving on rubber mounts independent of the outer ring. The outer ring has to be mounted fixed to the motor, so the two assemblies move together and this introduces many challenges regarding stiffness and vibration. The weight would increase to levels that would make foot launch impossible in my opinion.
Very interesting. I worked in R&D the cycling industry and love that Scout keep pushing the boundaries in efficiency through experimentation. The mk x prop with the softer elastomer is great for someone like myself who likes beach flying.
Anywhere exciting and an excuse for an adventure would be good. I've only been to Slovakia once, is the weather reliable enough? Balkans would be amazing. Or just something simple like France, Spain or UK...
If i were to say... create a gear train like 1:241 that leads to a bevel gear which runs along a crank to a propellor, how fast would and how large of a propeller would i have to make to propell someone on a paraglider? Im tryna make basically a flycycle 😂 I'm broke and want free flight so i though i would just go ahead and make it
They need to use an easy swap battery like you might find in a cordless hand drill. You could take several with you and, with a big enough capacitor, have it hot-swap capable.
6:00: gravem essa resposta. E digo desde já, concordo em ela. A questão é a mesma quando se fala do FlatTop. Muitos aparecem a reclamar por ser antigo, mas lembrem-se, como aqui foi dito: na aviação, o mais importante é a segurança e fiabilidade. Coisas que o flattop me oferece. Faz 10 anos que tenho o meu e apenas troquei de motor. Já me salvou em muitos situações.
