This is fantastic! As a variable prop flight engineer I really appreciate the efficiency benefits or variable pitch props, especially in the world of paramotors and its weight limitations.
Tom, do you have any commentary on the passively variable pitch prop that's been used on low HP UAVs, made by Aerovate? I realize that Aerovat'es design is focused on increasing speed range while Miro's design is intended for fuel economy, but as a variable prop flight engineer, I'd be interested in hearing your insights. For reference, a video on Aerovate's passive prop is available at ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3tAUyz8raa0.html
@@jonathanjaffe8897 Hi Jonathan, thanks for sending the link. The Aerovate variable pitch prop system appears to have the necessary safety features (pitch lock) and it uses the same (spring/CG sensor) technologies that have been around for some time, as echoed in the comments. The blade shape and twist appear to be designed for efficiency on smaller aircraft. Wonder if they plan on a developing a larger system to be used on a constant speed powerplants - reducing maintenance and complexity. I enjoy seeing the innovations that come with new materials and fabrication processes !
After being a hang glider pilot for two and a half decades I realize that innovation in this field is very slow. So I really appreciate something like this. Awesome job!
I respectfully disagree. Gliders of today are way better than 10 years ago. Several engine manufacturers have developed EFI and are very close to market launch. There are more and more paramotor frames well designed and engineered. There are some nice projects in electronics and headsets. This sport is going the right way I think.
@@SCOUTaviation That's really good but we will have to agree to disagree. And I suppose that a lot of little things do add up to big things, but what I see is that there was nothing that prevented this propeller from being invented 20 years ago. It's great work and I'm not trying to diminish the accomplishment but the technology was there waiting for someone to put it together. R&D budgets in our community are almost nothing and the people with skill and drive to advance our sport are somewhat limited due to a low amount of people within the sport. In 1992 the Swift had a 25:1 glide... Today it has a 27:1 glide. Only 2 additional glide points! I'm guessing that the tech to do better has been here for 10 or more years and finally next year we will see the Swift 3 with a glide in the low 30:1 range. I had a first gen hybrid wing that was first built around 1999 and had a 17:1 glide. To my knowledge the Atos still hasn't cracked 20:1 20 years later. Big advancements are rare and slow and usually by the time it is integrated into our sport the tech has been there for decades. I've read enough articles to suggest that right now there's a silicone anode battery out there that has 10 times the capacity of current lithium and makes gas for flying obsolete. But it isn't viewed as commercially viable due to "only" having 300 cycles. That doesn't cut it for a car but that's a decade of flying for many pilots. We don't have enough people out there looking for these things and implementing them. So it will be another decade before we see a comparable battery actually hit our sport when in reality we could be using it right now. This is why I feel like this sport moves incredibly slow...
As a paramotor pilot and UAV design engineer I'm really impressed with this technology as It is a plug and play item that requires no changes in the paramotor operation and provides amazing fuel save. Wish the best for the fine design and production of the product.
I am a private pilot and have been around airplanes my whole life.. At the beginning of the video I was guessing prop angles and guessed 12 percent for power and 33 percent for cruise..... Wow I was way off! Hahaha great idea! Thanks for the videos!
As a paramotor pilot and Millwright by trade this is a fascinating and amazing feat to see being brought to real life! Hope to try one out on my Scout someday!
These videos where you can see the continuous research work is what make me proud to belong to the Scout family. Always innovating!!! God job Miro and Stefan 👏🏻👏🏻👏🏻
I've been in engineering for nearly 50 years. To get something to work on the first try is like finding the Golden Challis. It never happens. Kudos to you! I hope to be flying with this prop soon!
I confused my flight instructor by asking for a wing that could change in flight to do what you have invented. Level flight at lower r.p.m. Never thought of a two speed prop. Your way ahead of this farm boy. Thanks!
Amazed that it is only 2 degrees difference to see real benefits. Of course everyone will want to know, how much? Will it really be worth the extra cost, or will it become one of those, "It's cool, I have it" status items? Before you even get to production, people will be asking for one for different engines and different RPM's
@@firstbloood1 I understand what you mean, but can your bladder last 5 hours? I suspect most guys would just load slightly less fuel for reduced weight. Also, even if 33% is true, that's only at cruise, so results may vary, depending on pilot behavior.
Being a GA pilot for years before I ever heard of a paramotor, I've often wondered why a variable pitch prop hasn't come along yet for a paramotor. Being a journeyman tool & die maker and designer, I've imagined pitch to be controlled quite similarly as a possibility, but no interest in pursuing it as it would be a mountain of R&D. Glad that you're taming that bull and looking forward to the eventuality. 🖖😉
So exciting guys!!! You were the first person I watched when I was getting into the sport and I loved how you share the technical science side of this sport. Keep working towards your goals, this community loves you all for it!!!
Please keep comments like this coming. It is rewarding for the whole team. Thank you. Sometimes I print screenshots of such feedback and show them to the guys in the workshop. They totally deserve it.
Prerobiť na jednu pružinu a prepákovať na druhú stranu aby sa minimalizovala chyba rozdielnej sily pružiny prípadne nastavenia.... ale inak výborná konštrukcia
I'd pay good money for that spreadsheet! I fly powered hang gliders ("trike planes" here in the US) and would love to try to adapt this to a heavier, more powerful aircraft. I have the design & machining skills, but it would take me forever to come anywhere close on the needed calculations. Kudos guys! Beautiful, functional design.
550 RPM reduction actually But we may try even steeper pitch With ground-adjustable 13 was maximum we could do due to loss of peak power and increase of temperatures. With Variomatic we do not have those problems.
06:10 - "The in-flight adjustment is done by the pilot from the cabin" ==> Not quite. The pilot adjusts the propeller propeller control to achieve the desired engine (and prop) RPM. The propeller pitch itself is fully automatic. Airplane pilots do not have direct control control of pitch (except for feathering and reverse). Rather, it is the propeller governor that controls pitch, and will continuously vary the prop pitch to maintain the selected RPM in various flight regimes. If the prop is turning at say 2300 RPM in cruise and the the airplane suddenly gains airspeed during a dive, the pitch is AUTOMATICALLY increased do maintain 2300 rpm, without pilot intervention. What the pilot actually does is use the propeller control to select best RPM for each scenario. Say, full RPM for take-off, 2500 RPM for climb and 2300 for cruise. The propeller governor will automatically command whatever prop pitch is necessary to maintain those selected RPMs without any further intervention from the pilot. The key here is that the pilot does NOT control propeller pitch. Rather, he chooses a desired RPM and the governor controls the pitch to maintain that desired RPM under varying conditions. The wording used in the video made it seem that the pilot must directly adjust propeller pitch for varying conditions, which is not the case.
Absolutely loving your dedication & innovation. Please keep up the good work. I can't see why this wouldn't work on very light aircraft. I have a Rans S10 which is a very capable aerobatic plane with a rotax 582 engine. The play off is thrust for aerobatics means cruise speed isn't that great. This prop could potentially give the same full power with a bit better cruise speed.
The innovation coming from you and your team pushes our sport further toward perfection. Thanks for the hard work and for sharing your discoveries with us. I’m looking forward to better fuel economy. Looking forward to the next video. Thanks
Thanks for pushing the limits with your innovative ideas. That propeller combined with the EOS 240. Then your really on to something! I’m testing the EOS 240 and it’s really efficient with a standard propeller.
This looks to be a great start to an awesome product! I currently fly an HE MV1 that uses 2.89 reduction and the same bolt pattern as a Moster,if this new prop fits this would be a great addition for some long XC flights.
Very inventive. Have you seen the system manuf. by Viking Aircraft? Probably no need for their degree of adjustability but their design is simple also. Ivoprop has another simple design.
I see this is a year old now. I think this is so very impressive. This should be standard. Factory certify the things and have them on every PPG as a stock prop. catch up to fixed wing standards.
I have always admired your dedication and expertise, but this time you guys knock it out of the park with this one. Congratulations on your hard work and perseverance hope to own one sometime in the future.
Electrics do not have so much efficiency or power change from 0-max rpm. You prop an electric motor for max efficiency at trim/cruise speed. There may be some efficiency loss when climbing at higher RPM but if that's a low percentage of the flight profile you're not saving very much. ICE are inefficient at cruise because they are pitched to allow for more power in climb.
Thank you guys for constantly changing the sport for the better! The whole community benefits so much from your passion & ingenuity! I am totally going to buy this prop as soon as it comes out! Just curious what the long time testing will show. Maybe we have to change the springs / their settings once in a while since they maybe will be affected by fatigue. Or maybe the forces are so low that the springs are not affected at all. Anyways: I love it!
I can see the neatness of the variable pitch prop, but why not design a smaller version of the CVT transmission (variable pullies) to vary the speed of the prop? The springs in the pullies can be changed to get faster or slower response. It would give you the grunt/speed for take off but reduce the speed of the engine to save fuel.
