ACRE wrote:

Jerry,

Ultimate P-port intake manifold. Up to 270 HP with 8000 RPM prop.
If it don't fit under the cowl raise the cowl. No more whining :)

It is well worth it. Tunes for take off, climb and top speed.
Replaces a constant speed prop at much lower cost and weight.
As icing on the cake it tunes for lowest fuel burn
at any altitude. Does everything. Has alternate air.
Large volume plenum. Catches excess fuel.

Uses off the shelf 2 inch tubes on 3 inch center line radius.
Also off the shelf Zero plenum chamber.

Shown in take off mode. Slot the top of the cowl to accommodate
four or five inches of lateral travel. Build a sliding panel
to seal the top of the cowl.

My Christmas present to you. Merry Christmas!

If you don't do it this way it is the highway!!!!!
Think about it! You better Think! Think what you are doing to you!!!

Paul Lamar

Here is a slight variation. The plenum and snorkel are fixed
and the U tubes move in and out. A 3 inch movement of the U tubes
is an over all change in length of six inches. About 15 or 16 inches to
21 or 22 inches overall. A little more thought needs to be given
on how the force is applied to the U tubes to prevent them from
cocking in the bores.

I think Bill Jepson came up with this idea a year or so ago (May 2003) but we never
developed it to this stage. Bill called it the Trombone intake as I recall.
Are you planing to build one Bill? Here is Bill's 3D as well.

When we get further info on the RV10 I will do a layout for the three rotor
p-port version. It is a bit much to ask to have six tubes slide in and out
rather than only three. 

This could be applicable to a 3 rotor street car as it is almost impossible 
to do a dynamic chamber 3 rotor engine. I think that was a factor in the demise 
of the 3 rotor Cosmo affecting both low speed torque and BSFC.

Paul Lamar
 
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