Found the gasketing material; I'll be fitting it onto the slide throttle
Saturday morning.

I'm now investigating how to make the mechanical linkage between the
slide throttle and the throttle handle.  Any notional ideas for what I
might fab for this?  The slide throttle requires roughly a 1 3/4" throw
between full open & full closed - so clearly I'll need a bell crank of
some sort.  If there's something that does the job I can simply order
from McMaster Carr, then I'd probably go that way.  Otherwise, I'll need
to design something I can mount onto the existing slide throttle assembly.

Mark Supinski

Order a 10-32 throttle control cable from AC Spruce
Pages 152 153 and 154 in the 2004 2005 catalog. Part # A1760
(877) 477 7823 I would get the catalog first if you don't
have one. No bell crank required drill two holes.
One in the instrument panel and one in the firewall.
They come in 3,  4 or 5 foot lenths.  You need to make a
bracket that bolts around the water pump for the 10-32 end
of the control cable. 3D for the new people.

Paul Lamar ...No rotor no motor.

Actually Mark is quite right - 1 3/4" of travel is insufficient.  Having
been there done that, the travel needs to be doubled to have a reasonable
throttle "feel."  The simplest method of accomplishing this is IMHO to
redesign the slide throttle to be two inches shorter, reverse (flip end for
end) the slide throttle to work as push (extend) to "OPEN", include in the
design a pivot point at one of either front corner to allow the installation
of a throttle pivot arm, and include a throttle cable attachment point along
one long edge of the slide throttle.  The throttle cable pushing on the
pivot arm doubles the travel of the slide throttle.

Terry Adams
Thorp T18C


Well first it is 2 inches travel and not 1 3/4". Second there are a
zillion successful throttle cables out there with only 3 3/8th" total
travel. It is an aircaft standard. Third they are vernier with a
small twist of the knob the throttle cable moves just a few thousands of
an inch. The part number I specified above is such an animal.

The cable is attached where it is to apply the force through
the center of slide resistance. To attach it anywhere else
will cause a tilting force on the slide.

However the easy way is to put a pivoting left side throttle lever in
the cockpit like a Piper Cub and attach the push pull cable half
way up the lever to double the travel. Not redesign the slide
throttle.

Sorry to disagree but it is about time we flew this p-port
engine. Redesigning the slide throttle after the 11th iteration is
out of the question.

Paul Lamar

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2005 All world wide rights reserved.