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Posted for "George Braly" <gwbraly@gami.com>:
Jeff,
Your comments are thought provoking. I guess it is possible I am just
dreaming this up from foggy memory, but I don't think so.
I think I still have the old Chelton data download files around. Not
sure.
From memory, when we got the airplane, the owner was operating it in
the climb about like this:
31" x 2500 x 28 to 3x gph with the TIT at about 1430-1460F
He was using a typical 165KIAS for cooling, and he had only
about 600 to 700 fpm ROC.
I verified this with some test flying. You had to use the
165KIAS or the temps soared!!!
Hottest CHT was about 415 to 430F by the time you got to
17,000 feet, even using 165KIAS.
When we finished modifying the system and fixing the fuel injector and
fuel flow set up, we were, again from memory, climbing about like
this:
38-39" x 2700 x 45 to 46.5 gph. TIT down about 1320 to
1380F
KIAS was about 145. Hottest CHT was about 380F in the
climb. ROC was around 2000 fpm.
Now, for a sanity check:
A 3200 lb TN Bonanza at 120 knots and 300 Hp will climb
1100 FPM to 17,000 feet on a std day .
If you add an additional 50 Hp, (up to 350 Hp) that same
3200 lb Bonanza will climb an additional 516 fpm faster, or around 1600
FPM.
Just using the TN Bo as a "rationality check" I I can't see why a
3200 lb LIV with 350 Hp would not climb at least 1600 FPM, and maybe
better than that given the smaller airframe and much lower drag
issues.
I do know the owner of the airplane, after the
modifications we installed, began getting comments, complaints/
altitude restrictions, etc, from ATC that he was sometimes climbing
out of their airspace vertically, in an unexpected manner, due to his
unexpectedly high ROC.
But....hard data is hard data.
One thing for sure, climb is all about raw horsepower, prop
efficiency, and cooling!!!
Regards, George
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