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Electric Helicopter anyone?
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Too likely to end up "in kebab form."
And for that reason I am out. For now
Will battery evolution ever make this possible - sounds like they require a heck of a lot of power to keep them airborne. -
Originally posted by administrator View PostToo likely to end up "in kebab form."
And for that reason I am out. For now
Will battery evolution ever make this possible - sounds like they require a heck of a lot of power to keep them airborne.
Nothing better than Avtur for that at the moment.
I for one wouldn't attempt to fly one.
Oi Cliphead, Helicraig, what about you?Comment
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Originally posted by administrator View PostToo likely to end up "in kebab form."
And for that reason I am out. For now
Will battery evolution ever make this possible - sounds like they require a heck of a lot of power to keep them airborne.While you're waiting, read the free novel we sent you. It's a Spanish story about a guy named 'Manual.'Comment
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Originally posted by Churchill View PostAll to do with energy density and releasing that energy in a controlled manner without things getting too hot.
Nothing better than Avtur for that at the moment.
I for one wouldn't attempt to fly one.
Oi Cliphead, Helicraig, what about you?Comment
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Originally posted by administrator View PostToo likely to end up "in kebab form."
I wonder why they don't enclose the blades in a protective box? For lift you only need air to move faster above the blade than below so don't need the whole atmosphere available to it.
Pressurise the box and you could go higher than any helicopter has before.
Have a closed box design and you could go into space.
Would also be useful for flying cars.
[this design lark is a piece of piss, where's my blank patent form...]Last edited by PAH; 30 September 2011, 08:38.Feist - 1234. One camera, one take, no editing. Superb. How they did it
Feist - I Feel It All
Feist - The Bad In Each Other (Later With Jools Holland)Comment
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Originally posted by Churchill View PostAll to do with energy density and releasing that energy in a controlled manner without things getting too hot.
The easiest efficiency gain would be to use a lighter pilot.
A rough estimate of the power needed to hover (ignoring material constraints) is:
(Mg)^(3/2) / (2 * r * sqrt(pi.air density), or roughly (8 *m ^(3/2))/r where r is the rotor length and m mass. So ignoring material considerations (weight of rotor doesn't scale linearly with length - bigger things get weaker), the longer the rotor the better.
There have been human powered helicopters too, but a wing is more efficient than rotors.Comment
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Originally posted by TimberWolf View Postexactly, and weight.
The easiest efficiency gain would be to use a lighter pilot.
A rough estimate of the power needed to hover (ignoring material constraints) is:
(Mg)^(3/2) / (2 * r * sqrt(pi.air density), or roughly (8 *m ^(3/2))/r where r is the rotor length and m mass. So ignoring material considerations (weight of rotor doesn't scale linearly with length - bigger things get weaker), the longer the rotor the better.
There have been human powered helicopters too, but a wing is more efficient than rotors.Comment
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Originally posted by Churchill View PostIs that in or out of ground effect and what about pressure altitude?Comment
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Originally posted by TimberWolf View PostBoth change air density, so that's built in. But the formula is only for ball park purposes as material properties dominate at the end of the day.
http://youtu.be/ba-dln366-EComment
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