I don't recall inflatable wings, but both telescoping and "ribbon" blades
have been tried. IIRC, the cloth rotor had a wire "spar" with a tip weight,
and a cloth single panel sail-like "blade". Also IIRC, the idea was to use
it in autorotation mode, as a deceleration device in place of a parachute.

Rigid telescoping blades have also been tried experimentally. The variable
diameter allowed for two flight regimes - high speed (with outer portion
retracted) and low speed (outer portion extended, more lift for hover
profiles).

I've got some info on my work computer, I'll try to post it later.

Dan Hollenbaugh
AnyBody43 wrote in message
. ..
Mark Hickey wrote in message
. ..
(sanman) wrote:

I was reading about inflatable wings:
snip
So you'd be riding a sort of lightweight automotive vehicle along the
road, and you could switch to helicopter mode, with inflatable rotors
popping out on the top of your vehicle. Your engine would then power
the rotors, and you'd fly away. Once you landed again, the deflated
rotors would be tucked back into whatever compartment they'd popped
out from.

Cmon, there are all kinds of wierd-looking lightweight concept cars
out there, so why not this? What would be the main difficulties with a
concept like this?

Given that centrifugal force keeps the rotors from folding upwards
anyway it seems a relatively small change in the principles of operation
to have such a mechanism.

If inflatible was no good how about folding/telescopic . . .
or just ribbon/strip with a weight on the end.


## Miniature emergency parachute hat ##

Since the "wing" area of a helicopter is much less than that of
a parachute, and that a helicopter CAN land softly without an engine
why not have a small device that:-

Is an auto gyro that infates out of a bag
Uses gas jets to accelerate the blades to operating speed
lowering the wearer safely to the ground.
Would be smaller and lighter than a conventional parachute?
Maybe a pyrotechic charge could be used as a gas source?

Perhaps a small hand grenade would be enough to get it going