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Human Powered Helicopter - Armchair Engineers Welcome!

Oct. 24, 2012, 11:18 a.m.
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Joined: Dec. 7, 2006

what about pre-loading a spring with a 40 minute warmup ride then usie the spring potential to augment the riders output? it would be like doing a hill climb then going faster on the downhill.

Oct. 24, 2012, 11:22 a.m.
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Joined: Dec. 7, 2006

Would that be allowed? or would that be cheating? I like the idea of using brakes to control the rotor speed. Maybe an electric system could be developed where regenerative braking could provide additional power to the other rotors without bringing in an outside power source. Kind of like a prius.

Oct. 25, 2012, 1:33 p.m.
Posts: 2313
Joined: Sept. 18, 2008

… I suspect the actual power requirement could be over 1000 watts. Is this a human accessible power? …

depends very much on rider weight in this experiment. some people could push 1000 watts for a minute, but they tend to be on the heavy side. they need to find a pilot with exceptional power/weight ratio, like a pro roadie.

Oct. 25, 2012, 1:57 p.m.
Posts: 4300
Joined: June 24, 2010

I didn't read the specifics of the contest, but I'm guessing electric assist is not part of the program.

flickr

Oct. 25, 2012, 2:16 p.m.
Posts: 4983
Joined: Dec. 6, 2002

They need Lopes.

C4 Rider Training 2013

Contact me at: cory@c4ridertraining.com

I am not so good at returning PM's as some have noticed.

c4race.com

Oct. 25, 2012, 3:17 p.m.
Posts: 18446
Joined: May 29, 2004

Have the rider turning a small hydraulic pump with an accumulator in the circuit to smooth out the pulses from his pedalstrokes,which then turns a hydraulic motor that spins the rotor through a gearbox. You could also tee in a circuit for a tail rotor and control its speed with a manual flow control valve.

/thread

Oct. 25, 2012, 5:06 p.m.
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Joined: June 4, 2012

Sounds like NSMB should be building their own prototype!

Oct. 25, 2012, 6 p.m.
Posts: 4300
Joined: June 24, 2010

Sounds like NSMB should be building their own prototype!

You know that idea would never get off the ground…

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Oct. 25, 2012, 6:23 p.m.
Posts: 18446
Joined: May 29, 2004

You know that idea would never get off the ground…

As long as we don't involve conveyor belts,we should be good.

Oct. 25, 2012, 6:38 p.m.
Posts: 704
Joined: March 15, 2004

They seem to get off the ground based on the ground effect - the rotors are extra effective in close proximity to the ground. The chopper climbs to 8 feet pretty easily,but no further, despite the intense effort.

Oct. 25, 2012, 7:31 p.m.
Posts: 6
Joined: Jan. 12, 2006

Have the rider turning a small hydraulic pump with an accumulator in the circuit to smooth out the pulses from his pedalstrokes,which then turns a hydraulic motor that spins the rotor through a gearbox. You could also tee in a circuit for a tail rotor and control its speed with a manual flow control valve.

/thread

Transmission losses much?

They seem to get off the ground based on the ground effect - the rotors are extra effective in close proximity to the ground. The chopper climbs to 8 feet pretty easily,but no further, despite the intense effort.

Agreed. Which makes my think of two possible solutions:
1) Lower the rotors. Have the pilot sitting above the rotors so that, at take off, the rotors are literally inches off the ground.

2) Have a single larger rotor and tail rotor like a conventional 'copter. Ground effect is good up to roughly the diameter of the rotor. Conventional reasoning says increase the rotor size to increase the range over which ground effect acts.

I'm not sure what the motivation is to have multiple rotors as they have? Seems like it requires a lot of structure that could be avoided with a conventional design?

Oct. 26, 2012, 5:43 p.m.
Posts: 704
Joined: March 15, 2004

2) Have a single larger rotor and tail rotor like a conventional 'copter. Ground effect is good up to roughly the diameter of the rotor. Conventional reasoning says increase the rotor size to increase the range over which ground effect acts.

I'm not sure what the motivation is to have multiple rotors as they have? Seems like it requires a lot of structure that could be avoided with a conventional design?

the tail rotor offers no lift and is therefore a waste of the pilots energy. 3 would seem a smarter choice for stability. though. A three legged table doesn't rock around on you… Might be completely different in the air though.

Feb. 22, 2014, 2:44 p.m.
Posts: 1042
Joined: May 30, 2004

what about pre-loading a spring with a 40 minute warmup ride then usie the spring potential to augment the riders output? it would be like doing a hill climb then going faster on the downhill.

That's not technically human powered, that's spring powered. It's no different that charging batteries through a bike connected to a generator/charger.

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