An electric jetpack just may be the answer in the short term until micro jet turbines are developed enough to give a sufficient power to weight thrust required for a practicable jetbelt solution.
If I were going to build one I would be looking at using 2x electic motors driving compressors that would each give ~80kg of thrust with an all up weight (pack+person) of under 115kg. That would give you some leeway if you were to have an engine failure although broken legs and pelvis are still likely if hovering above 20 meters and you lose one engine. I'd probably go for a centrifugal double sided compressor feeding a contra rotating second stage single sided compressor all made from carbon fibre reinforced plastic (CFRP). To handle the high rotational speeds I would use air foil bearings lubricated with tungsten disulphide. The engines would utilise a similar set up to the bell jet belt (ie upside down on your back and feeding into a shared diffuser). The most simple control arrangement would be to allow the pilot to shift their weight such as on the bell rocket belt. Vectored thrust would be more precise but would add weight and complexity.
You will need light motors with extremely high power output to get the required thrust. According to one formular I read:
Thrust in lbs= 9.35 x ( hp x D)2/3 power
hp= horse power, D = fan diameter in feet, 80kg =176lb
176lb = 9.35x(hp x 0.5) 2/3
Therefore you will need at the minimum 56.4hp (42.1kw) per electric motor but probably more due to the Reynolds number being small. At present the most light weight motors I know of in this power range are around 13kg... that is probably too heavy. To power all this you would have to go for a high voltage DC umbilical cord or a hydrogen fuel cell though I think the latter would probably not be practicable at this moment in time.
A new innovation in electric airplanes is on the horizon. This features a long life battery and high powered solar cells on the wings. this enables the plane to fly for extended periods before running out of power.
get a gas powered one
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