Large Scale Co-Axial !!

[Griffin]

http://www.dailymotion.com/video/x3pj1w_helicoptere-personnel_extreme

http://www.vansairforce.net/delete_eventually/RV-H.jpg



(Now if I take my Lama 4 and upgrade it a bit.....)

[daniel reese]

I Want One!

[Griffin]

It is fascinating. Both upper and lower blades run off a single motor. It is fixed pitch with throttle and directional control but I can’t figure out how he changes direction.

[ranger306ci]

tipovers would be brutal!

[eddiemoth]

Interesting invention! I am wondering if he feels the motor when it is flying.

[mtpenguin]

there is no cyclic.

You just move the entire tripod for control.

Kind of like a hang glider doesn't have control surfaces, you just move the whole wing.


B-)

[G-MRM]

Put me down for one too.....

(now where is that old lawn mower)


Martin

[daniel reese]

I can pretty well understand HOW it works, but Im not so sure about weather its safe enough to have on your head!

Its fixed pitch off a single motor-or could be two motors- hard for me to tell from the low-res video. Single motor means that the motor is running two "transmissions" one going cw, the other ccw. Dual motors would be simpler.

Altitude is controlled by rpm- no mystery there.

Rotation could be accomplished by a clutch-like system on a single motor; the rpm sent to one rotor could be reduced or increased proportionately to impart variable and conrtollable torque to the system. With dual motors, just reduce or increase throttle to one of the motors.

Cyclic action, as pointed out, are done by tilting the entire rotor system with the handlebars- like a hang glider...

But what if the motor quits at 20'? or, worse yet, what of one rotor set stops turning? I bet this thing does autorotations like crap!

Looks SERIOUSLY dangerous....I still want one (LOL)

[Griffin]

I had another look at the video. It looks and sounds like a single motor. There seem to be two hand controls. The throttle is controlled by his right hand and I am sure the rotation is controlled via that “rudder” at the back with his left hand. If you watch the rudder as he pivots you can see it move.

So tell me. What size motor and battery will we need to make one of these?? ;)

[broggyr]

Hate to think how effective that'd be for a fat guy like me lol

[Firadiz]

tipovers would be brutal!

There's a remedy for that. Don't tip overlol
I'm sure much harder done then said;)

[kersyboy]

My heli is just a comanche..... Well sort of..
http://www.youtube.com/watch?v=lYmyyYS9oUE&feature=user
http://youtube.com/watch?v=lYmyyYS9oUE