A new take on ultra-light gyroplane

JonSu

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Thank you
By the way, I thought about rotor pre-spinning.
Making a drive from the engine is, of course, good, but difficult.
In principle, the rotor on small gyroplanes is untwisted by hands.
Not very convenient, but simple.
I don’t offer anything new, it has already been applied. Make a drive similar to manual engine start - with a return rope. Sitting will be more convenient to do this. Movement from top to bottom.
As on some motodelts, the engine start knob.
It will not be difficult, autonomous and more or less convenient ...
The main idea of all this "disgrace" is to look at the design of the gyroplane from the "other" side ...
Well, and throw a couple of ideas. Maybe someone will come in handy ...
 

Brian Jackson

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Thank you
By the way, I thought about rotor pre-spinning.
Making a drive from the engine is, of course, good, but difficult.
In principle, the rotor on small gyroplanes is untwisted by hands.
Not very convenient, but simple.
I don’t offer anything new, it has already been applied. Make a drive similar to manual engine start - with a return rope. Sitting will be more convenient to do this. Movement from top to bottom.
As on some motodelts, the engine start knob.
It will not be difficult, autonomous and more or less convenient ...
The main idea of all this "disgrace" is to look at the design of the gyroplane from the "other" side ...
Well, and throw a couple of ideas. Maybe someone will come in handy ...
Very nice looking design. Agreed about prerotator. I'm doing something similar in my build, using a length of flex-drive up the mast and coupled with a foot pedal crank and small right angle drive for manual (leg) power. Not designed for flight speed RRPM but better than standing on the seat using the "Armstrong" method. Light and simple with spring lever operated normally-off head engagement.
 

Jazzenjohn

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The lightest solution for an ultralight prerotator is either a brushless setup or a cordless drill motor driving a bendix. The problem of the pedal powered prerotator is that the prime mover, i.e your legs, is capable of only about 300 watts and the lengthy transmission would end up weighing more than the entire Brushless or cordless drill solutions and provide less RRPM as well.
 

Brian Jackson

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The lightest solution for an ultralight prerotator is either a brushless setup or a cordless drill motor driving a bendix. The problem of the pedal powered prerotator is that the prime mover, i.e your legs, is capable of only about 300 watts and the lengthy transmission would end up weighing more than the entire Brushless or cordless drill solutions and provide less RRPM as well.
Thanks for the great info, John. It's not designed yet and I may scrap the idea while fleshing it out. But the original intent was to use very light gauge flex drive rated to about 1/4 HP (200 watts) and pedal gradually (not vigorously) up to perhaps 150 RRPM. Kind of a variation on Tim Blackwell's design of the recoil prerotator that I believe StarBee made available for a while. However I admit it's tempting to simply go the cordless drill route.

Sorry to hijack the thread.
 

Jazzenjohn

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I believe you'll need roughly 1000 watts of power to get 150 RRPM Brian.
 

Brian Jackson

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I believe you'll need roughly 1000 watts of power to get 150 RRPM Brian.
Looking through the RWF archives I believe you may be right. The Gizmo prerotator, though marketed as capable of 100 RRPM was reported by owners as being hard to get past 60. Leg power is more efficient but I see that it's the aerodynamic drag of the rotor where the theoretical brick wall is met. Haven't revisited this subject in a while, and thank you for the guidance.
 
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