--- Onno Meyer <[email protected]> wrote:
> > I've known for quote some time that the formulas
> in
> > VE2 didn't work for autogyros. They results in
> stall
> > and top speeds too high and takeoff and landing
> runs
> > too low. Anyone found a solution?
>
> * That leaves the stall speed formula. Using the
> VXii
> rules, you could change the lift area multiplier
> for rotors without side effects for other aircraft
> (since helicopters have stall speed 0 anyway).
This is the approach I'm taking, increasing the
effective rotor area for determining both stall speed
and top speed. Unfortunately, this still leaves
takeoffs and landings too long.
Autogyros don't have a stall speed in the same way as
fixed wing aircraft. Uf a plane flies too slowly, the
wing stops generating lift and the plane plane drops
like a rock. If an autogyro drops below a certain
forward speed, it gradually starts descending as he
rotors lose lift.
Landing runs of less that 5 yards is common. For
autogyros without "jump start" capability, 15 yard
takeoff runs are reasonable; with it, less than 5
yards is possible.
(In a "jump start" the engine briefly starts the rotor
turning at full speed, before power is transferred to
the prop and forward movement. The rotor is still not
powered in flight)
> What data do you have on autogyro stall speed?
Just numbers from assorted real world autogyro
designs. The lowest stall speed I found was 15 mph,
but this was with small wings. Wingless autogyros seem
to be more in the 20-40 mph range.
Brandon
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