Hi Paul,
Just wondering if there has been an update on Richard Sohn's
single rotary 12A.. Last I've read was that he has done some fast
taxiing work but no first flight.. Just looking for more info..
There hasn't been any updates on his web site either.
Regards Keith
I don't know. Richard?
Paul Lamar
I saw one for sale on barnstormers a couple of days ago- advertised
as 70 HP
Kevin Alderman
That is probably not a P-port. Probably not one of Richards
engines. Richard is getting over 90 HP at only 6000 RPM.
He would get over 120 HP at 7500 RPM with the right length intake
runners and a 2.85:1 gear box.
Interestingly Richard tried both side and P-port and the additional
side port was not worth the trouble.
Paul Lamar
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Here are some more pictures as of last October.
Paul Lamar
The Rotary Engine News Letter. Powered by Linux. ACRE NL web site.
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http://tinyurl.com/beqqxas
Copyright 1998-2013 All world wide rights reserved.
Here is some update.
I am still hassling with the TBI40(Ellison) unit.
First some general comments. The engine is running without any
issues, after the oil spitting was fixed. I am thinking now of
doing away with the oil separator, because both engines, the one on
the test stand and the one in the airplane are bone dry on the
breather hose. Cooling is just fine. always the same temperature,
170 F coolant and oil with doing takeoff runs to air speed over
rotation speed, as often as I want to.
So, Why do I not fly? Back to the top! When Rotec copied the
Ellison, they realized the importance of the fuel section between
the pressure regulator and the spray tube. They separated the
pressure regulator as a free standing unit to be located as
required depending on the way the TB is mounted. The installation
instructions are pointing this out in a, for my taste vague
way(makes me not look as ignorant as I might be).
Anyway, the apparent problem I am observing was never serious
enough to give up considering the alternatives. And this on top of
my stubbornness. One issue is the fact that on the rotary, in
particular with a P-Port, the intake is cross draft and an as short
as possible distance between the throttle and the intake port in
the rotor housing. Adding a limited space under the cowling in this
area, requires an orientation of the TBI40 suitable to confuse the
installation instruction.
In a nutshell, I had to separate out what is a mixture issue and
what is a fuel flow issue. As it seems to turn out, it is more of a
fuel problem. mixture is always pretty good.
When I orient the TBI40 in a way so it is running right, it beats
any carburetor I have been running in the past 5 years. Hopefully
tomorrow I will run the final tests for having a flight worthy
installation configuration.
Richard Sohn N2071U
http://www.fairpoint.net/~res12/home.html
Thanks for the update.
I am in Fl Richard and you are up early. :) Are you coming to Sun n
Fun this year?
Here is an idea. What slowed me down was the cost of all those tiny
laser cut holes :)
Paul Lamar
Paul,
The Ellison carb is really very intriguing…small, simple and
lightweight. How small do the holes in an Ellison-type carburetor
tubing need to be? Wire sized drills can go down to 0.0135 inches,
which is almost 5 times smaller than 1/16 inch. That's pretty darn
small! Is laser drilling really necessary?
Gene Kahn
he Rotary Engine News Letter. Powered by Linux. ACRE NL web site.
http://www.rotaryeng.net You Tube
http://tinyurl.com/beqqxas
Copyright 1998-2013 All world wide rights reserved.
<both-holes.jpg<brass-tubing.jpg<double-elison4.jpg<Ellison-copy4.jpg<Ellison-copy7-tube-cap.jpg<Endl-feed-2.jpg<flow2.jpg<hole-position-dimensions.jpg<Holes-in-tube.jpg<mixture-lever-ass.jpg<new-feed3.jpg<new-feed4.jpg<Over-all-dims.jpg<Slid-throt-opening-area-curve2.jpg
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The Rotary Engine News Letter. Powered by Linux.
ACRE NL web site.
http://www.rotaryeng.net
You Tube
http://tinyurl.com/beqqxas
Copyright 1998-2013 All world wide rights reserved.