Chuck wrote:

Here is a photo of my plenum chamber with 180 bends inside to take advantage
of the dynamic charging effect. I tried enlarging the openings in the bends
but never did get as much power as with the simple bell mouths made of
nylon. I took the bends assembly out and put the bells back in.
I never did understand how this was supposed to work. It looks like the
pulse charge would want to go into the box and out through the throttle
butterfly rather than into the other rotor. Perhaps my runners are too long,
but it would be really tough to make them any shorter, no clearance at top
of engine.

Chuck Dunlap

Finn Lasses wrote:

So why does it work for Tracy but didn't for Chuck?
Could it be because Tracy uses ram air with a short narrow path to the inputs of
the dynamic chambers? Chuck, on the other hand, had a huge plenum (allowing in and
absorbing the pressure pulses instead of passing them on into the other runners)
between throttle body and ends of dynamic chambers.

Tracy?

Finn

Pseudo science Finn. You will never know unless you make those pressure
measurements. I have been bugging you guys for three years on this
water manometer thing.

Robin mentioned to me today she thought before somebody could get 
their airplane flying with a rotary they must become an engineer 
if not a full blown  scientist.

Paul Lamar
 
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