ULM motorized with compressed air

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George
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by George » 19/12/07, 15:52

Hello everybody

The compressed air trike seems to be very fashionable.

Despite what "classic" engine manufacturers say, who emphasize the noise generated by the propeller, there is a big difference in noise between a heat engine driving a propeller and the same power generated by a silent engine.

Adept of "free flight", I look forward to the commercial release of the paramotor ... electric: 23 kg including 8 of batteries.
It is in the final phase but the price will be approximately 7500 € for an autonomy of 10mn with the 8kg battery!
http://www.razeebuss.com/essai.html

Why not a compressed air version?
I do not know the weight of a scuba tank, but if a "small" would be sufficient to obtain 1/2 hour of flight with a total weight not exceeding fifteen kilos, this could be an interesting alternative.

Do not fix yourself too much on autonomy, when we discuss with the professionals who line the ulm grounds, we see that 90% of the flights are laps and that a long flight is an hour. ..
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by Gregconstruct » 19/12/07, 16:05

How long do you fly with a combustion engine?

10 minutes of battery life is ridiculously short, isn't it?
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by George » 19/12/07, 16:15

You mean, how long do I fly WITHOUT motorization: One hour in winter, 3 or 4 hours in summer, per flight of course ... the motorization in the case of ultralight gliders is mainly used for initial altitude gain or to a few sequences or the finesse of the device would not be sufficient.

Autonomy is effectively unrelated to a heat engine or the amount of energy contained in a liter of fuel is incomparable.

However, this does not correspond to the majority of flights practiced (see laps of the track!) And moreover, the "silent" engine concerns aviation practitioners who are not interested in classic powered flight.
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by Gregconstruct » 19/12/07, 16:28

Seen like this, I understand better! : Mrgreen:
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by George » 19/12/07, 16:38

Another detail that is important: on the electric paramotor, we speak of 10 minutes of autonomy "at full power" which is required to make a maximum altitude gain of 900m!

This is not necessarily the use that would be made of it, the goal being on the contrary to cut the engine as soon as possible: during the very first flights made with the proto, the pilot flew two hours with his 10 minutes of autonomy. !
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by Gregconstruct » 19/12/07, 16:54

In fact, when we have no slope, we use the motor to launch as if we were using a winch, if I understood correctly?

Then it's a classic free flight ... 8)
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by George » 19/12/07, 18:14

Exactly, the more being that unlike the winch, you can take off on your own (you need at least a winch in the other case, not to mention the winch) and that in addition you can use it in flight.

For the record, a boy had laid a winch for himself (he took the motor and went up his cable) but his motor burned and he gave up.
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by Gregconstruct » 19/12/07, 18:21

Ok, thank you, I understood everything !!! : Mrgreen:
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by Chatham » 19/12/07, 23:37

george wrote:Another detail that is important: on the electric paramotor, we speak of 10 minutes of autonomy "at full power" which is required to make a maximum altitude gain of 900m!

This is not necessarily the use that would be made of it, the goal being on the contrary to cut the engine as soon as possible: during the very first flights made with the proto, the pilot flew two hours with his 10 minutes of autonomy. !


Well the paramotor is not the most efficient way to fly: it drags a lot, it takes a lot of power to maintain a level flight, it is very slow, much too sensitive to the aerology at my taste and to wind thermals good luck because the handling with the weight of the engine has nothing to do with that of a paraglider: provide a reserve parachute ...
On the other hand, of course with an ultra light glider, we climb to 300m with the engine and we cut: the foot, unfortunately good ULM gliders are abominably expensive (see for example the motorized Swift), and the cheapest are much less practical (difficult and long to dismantle, often impossible on your own, very bulky and therefore difficult to fit in a hangar ... I know something about it ... :|
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by Gregconstruct » 20/12/07, 08:26

Otherwise, there is also the model aircraft! It doesn't take up too much space (although ... :? ), it's easy to dismantle and when you spit you don't hurt yourself (although, if you take it in the face ... :? ).

Finally, aeromodelling is fun and not energy intensive !!! : Mrgreen:
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