Gang,

I was looking at RES's pictures of his single rotor
and was wondering about the intake runner length. For
a two rotor his intake is way too short. But the length
desired for a two rotor is due to the interaction of the
pressure waves between the rotors, is it not ? Does this
then mean that the length of runner in a single rotor is
not as critical ?
What factors would optimize a single rotor runner ? What
might the ideal length be ?

John

You are referring to the dynamic chamber which doubles
the effective length of the runner. Works great at 3000 RPM where
the required runner length would be four feet or so.
The RX8 manifold has a complex and bulky series of dynamic
chambers to give the best torque over a wide
RPM range.

Not needed in an aircraft engine that cruises at
about 6000 RPM. Required runner length is 2 feet
and no interaction required.

If they were better at 6000 RPM the road racers
would use them and they don't :)

Paul Lamar

Okay. Is this to say that on a single rotor there isn't
an optimal length ?

John

It is the same length as a two rotor. 2 feet.

Paul Lamar