JONA4AERO wrote:
I heard rotary engine makes enough horsepower. what about the

torque? Do you have a chart shows

rpm vs. torque and hp?

Torque does NOT make airplanes fly! HP makes airplanes fly!
HP is a force moving at a speed. One HP is 550 pounds of force
or drag or thrust moving at one foot per second. It is also
550 pounds of weight moving straight up at one foot per second.

<snipped>

Along these lines, for us pusher guys, a larger diameter prop isn't

usually an option.  Seems that a

wider chord will have to be used if we are going to run at 6k engine

rpm, and 2k prop rpm.

Any thoughts on how wide the chord can be in order to have an efficient

prop using a clark y profile

with three blades?
BTW, anyone know which profile is the most efficient, clark-Y, or RAF-6?

(pusher configuration)

Royce
(rest of message snipped)

I am not advocating that Royce. Run the engine at 7500 for takeoff
and the prop at 2700 with a 2.85:1 gear box. You are right on with the
wider cord. I think the jury is still out on what the best blade
airfoil is.

Paul Lamar

Paul
We will probably run our engine at 6k most of the time except at idle, since we
will be using a variable pitch prop.
We are also talking about a single rotor 6A. :-)
Royce

How does that change things? You will get less power at 6000 than you
will at 7500 almost no matter what.

Paul Lamar
 
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