George Lendich wrote:

Paul,
The designer of the Vision, Steve Rahm is interested in a low cost
constant speed prop/hub. Is it OK to tell him of the progress on the
LAEV.
I haven't sent anyone any info on this subject, is it OK to do so,
it might stimulate some more interest.
George (down under)

We don't recommend this prop for direct drive aircraft piston engines
as we don't intend to test it on a piston engine. Four cylinder
piston engines are very hard indeed on props. the torque peaks
go negative as shown in these charts.

With a two to one gear box and a two rotor rotary that fires twice per rev
the prop will see four smaller torque pulses that average out
to the same average torque as an equivalent four cylinder four cycle piston
engine. The big difference is the torque peaks are lower and the rotary
pulses do not go negative. The Lyc O-360 is, next in line to an A/C diesel, 
death to props. 

Furthermore we have a rubber device 
between engine and gear box that mitigates those torque peaks
further. Testing this prop on a four cylinder direct drive  AC engine 
is years away.


Paul Lamar
 
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