Ive flown that 4 prop type of paramotor. It went surprisingly well considering my lack of experience, however the landing was not so hot and I damaged the frame. The design was intended to be very light, but it sacrifices strength. Openppg quit making them and has gone to single prop design as well.

bravoo

Moster EFI is the first engine in aviation history without magnetto, alternator, charging coil. After 7 hours of flying in have to look for an electrical socket and wait 1 hour until you can continue your flight. The Iphone philosophy is now in the paramotor world as well. In cold climates and in winter, the battery life is reduced to 3.5 hours. Over time, the battery degrades and its capacity decreases. For your 6000 euros Now you need to consider all these additional factors when planning your XC flight.

The Ural Motorcycle went through this change and it reinvigorated the model.

Thank you so much again.... i want to ask you a question Is there a mobile app you recommend to measure the reclining angle?

great... bravoo

bravoo ... great

Hello sir my name is muhamad hasan in my rc gearbox planes i found medium size prop with medium number gear ratio is the best so i think in paramotor reduction ratio 1 to 2,5 is awesome, because air slip on blade to avoid that u need some high rpm , thanks.

On day two of my paragliding instruction🎉. I'm hooked. This interests me greatly. I'm going to show my instructor this weekend.

Hello, the project is so incredible ! Every are so enthusiasm about this new propeller. Why don't you do a croundfonfing ? Thanks

I make props for FLPHG and i have found that a prop prop that has a pitch that is higher at the root and lower at the tip gives great performance. props i make are 54"dia root 23" and tip of 20" one thing i have noticed is that my prop pull air in from the tips and act like flat winglets.

Incredible! I wish I could join, all the way from Australia. Looking forward to seeing some snippets of the adventure hopefully :) A video on how and what you carry on the adventure wingman challenge would be great and helpful?!

I wish it was a race, the sport needs a proper adventure race series. I also believe the cost is far too high I'm young and got into paramotor flying because it was affordable I'm not an old guy with heaps of disposable income $2590 to fly my own equipment, use my own gear, buy fuel and fly in a public space? To be honest that's kind of insulting.

You're a cool cat dude. Thanks for your contribution to the pursuit of the sky. Lotsa guys just do dumbass shit for clicks, pushing their karma, setting the worst example. You're the one pushing the real frontiers of performance for the sake of safety, and fun. Here's to you

Interested, do you provide flying course?

sounds amazing!

Solid development effort. An exotic design I would like to see tested would be a hollow blade that has a port at the root that sucks messy air from there and ejects it at the tip in a way that will negate tip vortices or allow higher tip speeds.

What about prop tip fences?

Didn’t the Wright brothers invent and use a very efficient propellor?

Thank you for making this and all of your hard work

Great video. KZbin isnt a stand alone instructor but the hundreds of hours I watched before training made everything click into place a lot faster at the training center.

Interesting video, goes to show that there's still prop re-thinking associated with very low speed flight. Almost no propeller expert has done exhaustive repeatable prop design work to fly at 25/30mph, perhaps RC prop design offers useful correlation. Experience leads me to state the following re powered para props; - longer props are more efficient than shorter props, almost w/o limit or exception - persistent prop tip speeds above .4 Mach, is annoyingly noisy - prop blade pitch exceeding [email protected] results in thrust/drag tail chasing (under 12deg is preferable) - 3+ prop blades are theoretically advantageous in pusher apps where prop blade shading is significant; also more blades at finer pitch is preferable to more pitch on fewer blades.

I think you are confusing a ducted fan with a shrouded prop!!!!!!!

I forgot to mention, Bowers says it will reduce noise. The washout formula is used to reduce computer fan noise on the International Space station. It can be found here: kzbin.info/www/bejne/a4SpeJuln6ZgrKs

Use an electric drive system to help you evaluate props. You will be able to see extremely subtle variations and performance with high accuracy. Especially if the system will let you log volts, amps, RPMs, etc

Dear Miro. I love your approach. You have refused to copy all other messing manufacturers, which copy one anothers, all doing the same gross mistakes. One only note about this video. I have introduced on my belt reduced nanotrike engine a customized increased reduction ratio matched with higher pitch. And my prop is spinning at max 2500 revs Min. I have achieved a level flight at a consistent lower rpms. You have mentioned the same test with 3.45 reduction ratio, and you have had no significant improvements in noise or fuel consumption. But you didn't say anything about climb ratio. Why?? According to my experience, you should have improved it. Isn't it? Kindly.

Geek!! Cool!!

Hmmm. Sounds like you did not take into account the bad laminar flow, a Paramotor Prop is facing. You may not optimize prop design by conventional means. Rather, build a prop more robust against vortices. But I am afraid, that was impossible. Anyhow. You did nop see big improbevements with any of your designs. What did you expect? Conventional props work quite well in measn of efficiency, so any improvement must stay in the few per cent range. And that's what you did measure.

Just here again watching this video because it’s so interesting and efficiency of our paramotors can change the way and distance we could fly! 😁🤞🏽

dumb idea that fan would need quite a few HP at 8,600 rpm . Make up a dummy hub / model aeroplane electric motor and you will see that the guy who recommended the extra cooling fan . obviously hasnt a clue .

non-planar blades...

The carabiners offset in the miniplane first example is wrong. They are moved to the left, not to the right. Cheers 😊

I have been working with his research a few years. Id be hsppy to help you get started. I design flying wing models.

The aerodynamicist Al Bowers said it can be applied to props.

The idea is to reduce the tip vortex strength and move it inboard.

NASA found 15% efficiency increase by using much more washout in the tip region. About 4 times the normal washout for a typical wing.

This KZbinr has tested a large number of designs of boat propellers. Including a Prandtl design which performs very well: kzbin.info/www/bejne/oarNdKqvm9Oli5o

Have you tried specifically a Prandtl foil? The Sikorsky looks by eye to be similar. But Prandtl propellers are known to be high efficient and low noise. kzbin.info/www/bejne/rV7HnGSEpbuBhKs

What proportion of the annoying part of the noise is from the prop and how much from the engine?

Dji made something interesting with their props years ago, take a look at them. It’s a long blended winglet, Boeing 787 like… it even ends with a sharp tip. Those props are way quieter.

16:17 this is just killing me😂 of course the results don’t match. Too many uncontrolled variables.

14:29 bro there are so many uncontrolled variables in your experiment that it could be 20%+ better and your data might show a 20% decrease. I urge you to consider static testing, it’s at least a good starting point.

14:03 how do you factor all the variables. Pressure, temperature, humidity, pilot input, etc.? Regardless, great video.

You are going to NEED a variable pitch prop, to maintain full power, for maximum climb rate. Anything else is window dressing. As the engine heats up, and starts to lose power, the prop would de-pitch, and maintain peak power RPM. Having the pitch increase from there, as you reduce throttle, will get you SIGNIFICANT gains in fuel economy. You can use electronic systems which are similar to RC variable pitch system, or you could use an aerodynamically controlled system, like the Aeromatic prop, from decades past. The only thing it's REALLY missing, is altitude compensation. Ah. there it is. You're talking about your variomatic. That is only RPM dependent pitch, and it needs to have an aerodynamic (load) dependence, in order to hold the engine at peak power, instead of having to set the rpm above peak power rpm, to account for heat sag.

Amazing Miro, truly amazing! You and your team just keep trying to make these incredible machines more efficient and fun. Thankyou for “failing 5 times to set scene 1” 😄 this is why I chose Scout! You guys are unreal 👌🏽

2 comments, thus-far: 1. WHEN switching from a 2-blade prop to a 3-blade design, THEN one should be reducing the chord significantly, to keep the wetted-area similar? Also, at higher-altitudes, more-blades is apparently better, resisting loss-of-thrust as the air-density drops ( I don't know if you'd find that at 8,000' altitude, which is the safety-ceiling for no-supplemental-oxygen, ttbomk ) 2. the Darth Wader should have altered only 1 thing: 7800rpm max-power operating duration. It *should* have extended that. Nothing else that I can think-of.. --- Back to watching the video.. ( : --- "seconds to climb 100m" depends entirely on air-density, air-temperature, AND humidity! --- I don't understand why you weren't using a genetic-algorithm in OpenFOAM? Let IT find the optimal thickness/chord/pitch/distribution-of-force ( which should be elliptical? ) --- Ah, you've got the "toroidal propeller".. Please go watch videos on the Sharrow propeller: *nearly all* the noise from the normal prop is from cavitation! The Sharrow isn't cavitating: it's silent.

Tried it all? But did you try the Prandtl washout twist? The claims are: less drag/torque, lower power consumption, and less noise. If you're still experimenting it would be interesting to see the results.

What about prop winglets?

I wonder if its different in the US and Europe. Here in the US, 140cm props are the standard and probably 70% of new paramotors run it. 130 was the standard up until about 3 years ago and has been replacing the 125cm with a slow phase out starting ~15 years ago. Great work on the prop! I hope to try one some day!

That quiet you enjoyed is why I fly Hang-gliders every chance I get. The powered Hang-glider (Sub 70kg using a Polini Thor130) is only for last resort flying. The new fuel injected engines will allow easy inflight restarts, Ill use the powered much more then just using the engine as a launch and relaunch tool 😎👍