kinda heavy at 6.25 lbs and at 15 - 18kW it's overkill for a direct drive using a prop of approx 34"x22". Think XC.Īnyway, hope this helps in some small way. I think only 60% more capacity is still just a drop in the bucket when it comes to doing real work. He indicated that would put electric driven vehicles within the realm of ICE vehicles. The gentleman that actually invented LiPo battery technology but that history forgot recently indicated that he and his team were hoping to increase the capacity of current LiPo technology by a whopping 60%. I was looking into E-bike hub motors and I found a unit that would possibly work, but I cannot find the source now. But for simplicity in build, perhaps a large diameter pancake motor would be easier. The reduction drive is actually on par if not more efficient than a larger diameter, slower reving motor. I also found that a higher reving motor is quite a bit more efficient than a slow reving motor, and the higher reving motors are much less mass. The higher the wing loading on a pitch-sensitive, short-chord, low Cm craft, the easier it is to fall over the falls. I'm no lightweight, and with the added weight of an E-power harness, I would be afraid of getting into slightly rowdy thermally conditions, just the stuff you need to stay up with a heavy e-harness system. Nothing I could find that was reasonably economical (compared to say a used mossi) could match the performance and total power that I wanted. Any smaller disk area and the efficiency would drop dramatically, not to mention the substantial loss of low-speed thrust. Those were the numbers that I would need to achieve to make this electric propulsion project a success. The wasp is published with slightly less power 10.4 kW (14 hp) prop rpm max, 3.54:1 reduction, and the Mossi has published 11.2 kW (15 hp) 2486 prop rpm max, 3.6:1 reduction. I did a BUNCH of research into this very topic last year, then did some soul searching and found that this kind of power assist would not really be to my liking, so I'm working up the calcs on hydraulic / electric static tow winch systems, as no one is currently making/producing anything like that now that will tow a HP HG or a tandem up with step towing.Ī Mosquito NRG and the Wasp with the Radne Raket make approx 110 lbf of static thrust with the same prop (52" x 21"). I do not know how to factor in propeller load as applied to RPM and motor load. This may be a good motor to use direct drive if I could get one made at 18000Wt. They publish the usage of this motor to be for para gliders. If I run the E-Hobby motor at 52 volts then I am dropping the current by 20% and if I do not operate at full power, just enough power to achieve around 2300 RPM then I generally will not be running the motor at full capacity.Į-Power has a 50kv motor at twice the price and power (45hp). Plus I have had an electric airplane manufacturer mention that they can only operate their motors at 45%. This motor can actually take 70v, but I would have to add gear reduction. 8 = 3,328 RPM, which puts me within the direct drive range. ![]() E-Power Hobby has an 80kv motor that would produce 80kv * 52v *. I would like to spec a motor that has high torque at 2000 – 3000 RPM whereby I do not need to add mechanical gear reduction to the design. After this motor RPM is geared down 6240 / 2.85 = 2190 RPM. All these designs seem to be using the Rotomax15cc 15kv motor at around 52 volts, which would yield 150 * 52 *. ![]() More recent higher performing systems are using bigger propellers with geared reduction 1:285. Early E-Help systems use small propellers at very high RPM. From what I know so-far the formula for RPM is motor kv * motor voltage * losses. Looking for advice regarding picking a motor for an E-Help powered harness for a hang glider.
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