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 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
I measured the Ellison [?] carburetor hole sizes compared with
the outside orifice opening
size from the picture. The orifice opening was 140.7 times as
big as the hole size [hole
size from picture 0.7mm, orifice size from picture 98.5 mm].
So if the actual orifice size
was, say, 2 inches, then a drill size of [2][0.7]/[98.5] =
0.0142 inches. That is larger than
the smallest wire drill size of 0.0135 inches!
Gene Kahn
Just did the final test with The TB40 orientation issue. I have
to totally
rework the throttle linkage. It need to be a double acting
Bowden cable type
of drive, so I can set the orientation without messing up the
throttle
drive. My room limitation under the cowl is also playing into it.
BTW, describing what I found about the TB40 orientation to the
ROTEC guys ,
appeared to have turned them off talking to me. I just wonder!
Richard Sohn
N2071U
Hi Richard. I've been repeatedly perusing your web page the past
few months. I've spent some time at work repairing Hurco CNC
mills and I'm hoping to convert a Hurco mill this year to use
Linux and EMC2. I'd like to develop the capability to machine my
own pieces as you have done.
Do you know the approximate weight of your engine at this point?
Many thanks!
Dave Klingler
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