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Chance Waite

Electric Paramotor...with a Generator???

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Something I have been thing about lately and may very well do, if I can figure out the particulars...I wanted to somehow acquire  a used paramotor frame on a trike and use a 2000W generator to provide a direct A/C current to a 80kv brushless motor. Seeing as how the power supplied from teh generator is 120v, I am not sure if I need to "step-down" the voltage, since the motor is rated at 70v, using a step-down device (power supply) or if I can just use a heavy duty ESC to do this for me, along with a servo to meter the power and thus the speed to the motor. Any thoughts on how I could accomplish this or is it even possible? I am looking to extend the flight time by mounting a "super-quiet" or some other variety of generator to the paramotor frame rather than a standard gas engine, or batteries in the case of an elec motor,  to power the prop. Is there some kind of "supply and demand" law I am violating or some other reason people resort to using batteries in this sort of an application rather than a generator?

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My machine is rated at a little over 21 kw.

Level flight (for me) is somewhere around 65% of that, so 13.6 kw.

Current battery technology gives you around 30 minutes flight for 20 kg battery.

So:

1. Flying with a battery. A 2 kw generator will provide only 15% of power needed. So during the time taken for the battery to run down will add enough back for another 4.5 minutes. A bigger battery would be a lot lighter than having the generator on board as well.

2. Without a battery. You need at bigger than a 14 kw generator and it will weigh lots more than just having the petrol engine/prop.

The point is, hybrid vehicles are aimed at economy and not weight saving. They are very heavy.

 

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Well, originally, to increase flight times. However, I spoke to a mechanical engineer who works for a large aerial vehicle company who told me that I would not be able to generate enough amperage using a generator (one that is small enough to fit on your paramotor trike), so I guess I would have to use batteries. I am not as excited about that though, so I probably will stick to gas engines for now.

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Flylight at Sywell near Northampton have experimented with these hybrids in conjunction with engineering boffins at Cambridge university for many years with at least 2 different 3 axis efficient microlights. They can get the aircraft flying but the performance is never much more than marginal.

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you should check out a guy on youtube called robert murray smith, he's a proper mad scientist type of bloke that makes batteries and does all sorts of other fun chemistry type stuff, he built a graphene battery for an electric moped out of a stack of printer paper, dropping the much heavier OEM battery for something that's a fair bit lighter albeit a bit bulkier, gives a little glimpse of what battery tech in the coming years will be like, far lighter, more energy density etc, ideal for use in the air where weight is a premium.

 

 

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