EPPG1 design
Posted: Fri Aug 16, 2019 5:54 pm
So I am designing an electric paramotor...not sure why, I love my EOS150 powered parajet zenith, but I think an electric would be easier for those quick flights (possibly after works), or maybe easier to take along on a road trip with the family. no stinky gas in the car, etc....Or maybe it's that I have always loved electric power systems, since my RC plane, heli, and drone days (still have some planes and multicopters).
Of course I have looked at the OpenPPG project (https://openppg.com/) and downloaded the model files etc. but I don't like the small props. there are bigger props and motors to turn them available now. In fact that is where my journey began....The power system.
The plan is to use 30"x8" props (762mm) turned by 100KV 9235 motors. Of course fitting those huge props into a frame is the tough part. They have to be overlapping. and the mounting points are in very different spots than the standard openPPG motors, so it is not a simple drop in....I was thinking of designing a whole new frame, but I suspect modifying the openPPG frame to mount the new motors will be a faster and simpler way to get into the air. I have started to design all new arms, for the open PPG, but may rig something up with the existing arms if I can get a bare frame ordered. (which I might be ordering soon). Maybe I will eventually end up designing a whole new frame...not sure at this point.
of course, these large props will not allow the arms to fold so that feature of the openPPG is lost. I have an idea for removable arms that may work, and would still allow for packing it up in a car.
The motors with the 30" props make 11kg (24.25lbs) of thrust on 12S with 46 amps of current. so all 4 will be 44kg (97lbs) at 92 amps...and I already have this 250A 14S capable speed controller. Also the mounting system for the props allows them to be doubled up for 4 blades each, but I will have to do some testing on those. Another variable is the overlapping props, not sure how that will affect thrust efficiency.
Toby
Of course I have looked at the OpenPPG project (https://openppg.com/) and downloaded the model files etc. but I don't like the small props. there are bigger props and motors to turn them available now. In fact that is where my journey began....The power system.
The plan is to use 30"x8" props (762mm) turned by 100KV 9235 motors. Of course fitting those huge props into a frame is the tough part. They have to be overlapping. and the mounting points are in very different spots than the standard openPPG motors, so it is not a simple drop in....I was thinking of designing a whole new frame, but I suspect modifying the openPPG frame to mount the new motors will be a faster and simpler way to get into the air. I have started to design all new arms, for the open PPG, but may rig something up with the existing arms if I can get a bare frame ordered. (which I might be ordering soon). Maybe I will eventually end up designing a whole new frame...not sure at this point.
of course, these large props will not allow the arms to fold so that feature of the openPPG is lost. I have an idea for removable arms that may work, and would still allow for packing it up in a car.
The motors with the 30" props make 11kg (24.25lbs) of thrust on 12S with 46 amps of current. so all 4 will be 44kg (97lbs) at 92 amps...and I already have this 250A 14S capable speed controller. Also the mounting system for the props allows them to be doubled up for 4 blades each, but I will have to do some testing on those. Another variable is the overlapping props, not sure how that will affect thrust efficiency.
Toby