Joe Horton wrote:
>>I did probably 100 taxi runs on 357CJ. I never ever thought that it
was about handling after a couple runs. It was about the engine. I had
originally built a snorkel for the fresh air to carb and it was not the
right thing to do but only became known by high speed taxing. If I would
have taken off in the original configuration I most certainly would have
been a statistic. If I would have taken off in the original
configuration I most certainly would have been a statistic.... <<
To clarify this a bit, I think what Joe was referring to was the
Aerocarb ACV-C05, which is a gravity feed carb, and the gravity feed is
negatively impacted by ram air. I had a similar experience with the
Faughn KR2, which had a gravity feed Posa carb, and ram air. When I
flew to Omaha to pick it up, I spent hours trying to decipher exactly
how to keep it running at takeoff RPM, because the mixture knob would
kill the engine at several different positions, even full rich! And at
full throttle, the engine would quit! And once flying, it had to be
adjusted again to maintain RPM, as incoming ram air pressure had
changed. It was a matter of slowly moving mixture and throttle knobs
around to find a sweet spot where max power was developed, and since
full throttle didn't work, I didn't have the luxury of the VW's "full
power"! This got very dicey when I took off over the nearby highway,
and even with the long runway, I was concerned about hitting the top of
an 18-wheeler because I didn't have much altitude! Once I got up to
cruise altitude, I learned a lot more about the mixture/throttle
settings, and how badly I needed to install some trim tabs on aileron
and rudder. Once I got home, I didn't fly it again until I had an
Ellison carb on it, which is not a gravity feed carb, and is pretty
normal and predictable by comparison.
Don't do what I did.....bring a trailer with you if you buy an airplane
that's been sitting and the owner can't demonstrate full takeoff power
to you!
Mark Langford
m...@n56ml.com
http://www.n56ml.com
Huntsville, AL
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