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Message
Greetings,
I'm still thinking of using
the single rotor engine for a gyrocopter, and started considering the
possibility of using a ducted fan to
eliminate a couple problems.
Problem one is the lack of
a proven redrive for the single rotor, and problem two is height of most
gyros. Since the rotor has to clear the pusher prop, the mast ends up
being really tall, and the prop is usually shortened as much as
possible. This means you end up with an 8+ ft high gyro that won't
fit in the garage, and a short 60" prop which is far less than ideal for
thrust.
I know nothing about ducted
fans, so I'm looking for a bit of a reality check. If I want to run direct
drive blades at 7500 rpm, it looks like I need to keep them around 32" in
diameter to stay around .9 mach. This seems really short, but short
is great as long as it works.
Can anyone venture a guess
as to how long the fan unit would have to be? Would it end up being
as heavy as a redrive, or is there weight to be saved.
Thanks for any
thoughts. It may just be a wild and crazy idea, but I had to
ask.
Cheers,
Rusty (out of touch
till evening)
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