Monty Roberts wrote:

Ken Welter wrote:

  I have nearly 1000 hrs on my 5 blade warp drive prop and have
nothing but good to say about it. The way I figure is if it can lift
my coot out of the water at a gross weight of 2600 lbs and climb to
13000 ft and cruise at 110 mph it should push giro copter just fine.

Ken,

I wasn't saying that the prop wouldn't work. It will work fine. But if you
want to get the best performance, that is just not the way to go. When I
worked on Drag cars I always thought that it was Ironic that the guys were
spending megga $ to get 5 more HP out of a hand grenade, when they couldn't
even effectively get it to the ground. They would have been a whole lot
better off spending the money on chassis and suspension tuning. Props are
the same way, they make all the difference in the performance of the
aircraft. That is why I think a low cost, simple, variable pitch prop with
correct blade design is such an important thing to have. They had em in the
1930's for cryin' out loud. Why have we taken a step backward? A smaller
engine with a properly designed prop will outperform a big, heavy,
high-powered, gas-guzzling, engine with a fixed pitch prop if done properly.
It will have more range, better take off performance etc. It is the
automotive equivalent of having one car with an infinitely variable trans,
and one with a single gear, where you slip the clutch all the time.

Monty

 
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