Spoke to the guys at the shop today. We worked out some details.
     We are building a prototype of the slide throttle and the P-port bored rotor
     housings.  We will have them at Sun & Fun in the engine workshop area.

     Since the slide throttle goes along with the P-port we will offer
     the machined rotor housings for P-ports as well. No idea on the price yet
     but somebody will have to order a minimum of ten. You can send your rotor
     housings and when we get ten we will machine them and ship them back. You
     supply the rotor housings. They will be bored on NC machine tools.

     We are also looking for somebody to retail these parts.
     If you are interested in doing that send me email marked private.
     We have no intention of retailing these parts.
     We will place your name and company info on our web site as a
     suppler of these parts.

     Paul Lamar

Ben Baltrusaitis wrote:

Paul, would it make a difference if you turned the slide throttle 90 degrees to operate them vertically? I'm looking at putting them on a 20B and if there is a concern of frictional force on the 13B
setup, a vertical orientation may work better on mine.
Also, when cruising at partial throttle, would it be better to have the throttle opening across the rotor surface rather than only on one side?
Thanks!
Ben-- 

Not as far as frictional forces are concerned. They are caused by the high pressure
differences from  one side of the slide to the other. On a three rotor
you might want to build the ball bearing style as first shown as
the forces can be up to 140 pounds.

As far as your second question people rarely cruise at partial throttle.
What happens is people climb to 8000 feet or above  where the engine runs
at 80% power or below with the throttle wide open. This may not apply
to turbo charged engines however.

A few years ago Ken Powell came up with this idea. It was an attempt
to combine the throttle function with a intake port timing change.
Having realized that most people cruse over 8000 feet WOT we never
installed it on an engine. I will upload the drawings and pictures in the 
next message on this subject.

Paul Lamar
 
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