ULM motorized with compressed air

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George
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by George » 20/12/07, 09:40

"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's very slow, much too sensitive to aerology to my taste and to wind up 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 ... "

The paramotor actually suffers from an engine hidden by the pilot and poor aerodynamic performance.
The "razeebuss" style engines, on the other hand, integrate the free flight side by distributing the weights in front (batteries) and behind the pilot (engine and chassis), this avoids the effects of the thermal balance.
Everyone has been equipped with it for a long time for the rescue parachute!
The slow flight of the paragliders makes it so charming, it is a must in terms of aerology and it is undoubtedly an advantage in light conditions.
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by Chatham » 20/12/07, 12:03

george wrote:Everyone has been equipped with it for a long time for the rescue parachute!
The slow flight of the paragliders makes it so charming, it is a must in terms of aerology and it is undoubtedly an advantage in light conditions.


Para rescue: in paragliding yes, but few paramotorists have it (that's weight and € more ...)
In light conditions yes, but when the conditions are rising, especially during the flight *, it quickly becomes dangerous (with a paramotor even earlier): on the Markstein site (Vosges) for example. we can no longer count the number of accidents often severe by folding, closures, etc ... being suspended at the end of a rag has always scared me because we do not control anything when going out limits that are quickly reached ...

* One day of great weather and moderate wind, I left in an ultralight "Skyranger" for a 2 hour ride: on the way back the wind had grown considerably at 100km / h at altitude (not announced by the weather forecast) and 50km / h + gusts and flaps on the ground, the wind being across the runway: it was hot on landing, a pilot with little training would probably have ended up on his back or in the background ...
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by George » 20/12/07, 12:41

By helicopter with turbines (two in case) it is even safer but that is not the point ...

The subject: is an ultralight motorized with compressed air; I sent a post to K'AIR to get an early answer on the feasibility of a paramotor using this technique.

If anyone has any idea how much weight this can represent?
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by Chatham » 21/12/07, 00:05

george wrote:By helicopter with turbines (two in case) it is even safer but that is not the point ...

The subject: is an ultralight motorized with compressed air; I sent a post to K'AIR to get an early answer on the feasibility of a paramotor using this technique.

If anyone has any idea how much weight this can represent?


Just for information, the helicopter is one of the most dangerous aircraft that exist ... an engine failure at a few tens of m high is guaranteed death (moreover between the ground and the altitude necessary to have the time to switch to a "autorot" we call it the "death zone" ... hey yes ... and on some helicopters you cannot do autorotation, suddenly they have at least 2 engines (Kamov helicopters with double counter-rotating superimposed rotor)

An 18L / 220bar chrome molybdenum steel diving cylinder (standard equipment) weighs 20kg x 2 = 40 kilos (not counting the weight of the air!) And you still need a regulator, piping, air motor and a reducer (very little torque at low speed, an air motor must run fast), a matter of 60kg in all ... as I said, compressed air does not seem to me to be very suitable for an ultralight ... too much heavy and low autonomy ... composite bottles weigh ~ 40% less (empty), but they are professional equipment, just like 300 bar bottles: I let you imagine the price ... : Mrgreen:
Just for info, a paramotor engine complete with cage and propeller ready to fly HE R80 16hp for 23kg and 2.5L / h in consumption costs 4200 € TTC at Yvasion: it will be hard to do less ... : Cheesy:
Last edited by Chatham the 21 / 12 / 07, 09: 39, 1 edited once.
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by George » 21/12/07, 09:34

It's funny how scared some people are of everything! the helicopter is super dangerous, the paragliders close, the engines break!
Chatam, you must have stopped flying, right? You will have to get used to it too: men die!

For compressed air, 20kg per bottle! that seems huge to me!
If it goes on these weight ranges, I prefer to wait for the electric paramotor, at least there are development possibilities on the storage of electricity ...
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by Gregconstruct » 21/12/07, 09:41

I've never been scared in a chopper!

Whether it is for any flying object, don't we say that it is the takeoff and landing phases that are the most dangerous?

Even if we don't know how to self-rotate below a certain altitude, I think that a plane that makes a crappy fart while being flush with the carpet is also badly blocked ...

Finally, it is my opinion : Mrgreen:
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by Chatham » 21/12/07, 09:45

george wrote:It's funny how scared some people are of everything! the helicopter is super dangerous, the paragliders close, the engines break!



The day you pick up the half-charred pieces of friends who have fallen from the sky, you'll be a little less sarcastic ...
Me, I'm just realistic and I remind you that everything that goes up in the air necessarily comes down, it all depends on how ... since I pilot, I avoid taking stupid risks according to the good principle: "there are old pilots and reckless pilots, but there are no reckless old pilots ": the guy who told me that 30 years ago died at 80 years old in his bed after 60 years of piloting, of which the last 20 in ultralight ...
: Cheesy:
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by Gregconstruct » 21/12/07, 09:50

Seen from this angle, we understand!

It's like for mountaineers! A good climber dies in his bed (as far as I'm concerned, I hope it will be while having sex).
There is an expression not stupid at all that comes out of a film: "A good climber always wears suspenders in addition to that belt!".
I think this principle of safety is applicable to almost everything!

Always pay attention to safety!
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by George » 21/12/07, 10:08

Let's not confuse the real risk and the subjective risk: free flight is scary, yet it is one of the safest air activities, much more in any case than ultralight or recreational aviation ...

The safety culture is very present in this sport where almost all pilots are equipped with a reserve and fly with equipment tested at 8G, this is far from the case in ultralights.

I am going to have 20 years of free flight, I have lost pilot friends for causes that are purely attributable to them, not because of this sport.

I really pity those who live in fear but find it a shame to try to communicate it to others without foundation.
Fear is healthy and must be fought with knowledge, but action must take precedence in life, otherwise nothing is done!
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by Gregconstruct » 21/12/07, 10:21

With all due respect, I don't communicate fear but safety!

If I were a jerk, I wouldn't be working as a pylon fitter and other perilous jobs!
I wouldn't be doing sports like mountaineering, freeride mountain biking and a whole bunch of other rather risky adrenaline sports either!

Safety and intelligence is what keeps us alive! Fear when it is under control is a necessary safeguard!

If you're never scared, you must be really bored because you don't get your adrenaline rush!
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