12/23/2003 10:02:26 PM,
Serialize complete at 12/23/2003 10:02:26 PM
Hi Fred,
Yes, I have seen the site. Unfortunately this site bandies some jargon
without explaining anything.
For me, their credibility is hurt by their use of "constant velocity" when
it is actually constant vacuum or "depression".
I think my previous description of the theory of operation is right,
though I admit it could certainly be wrong. If I am
wrong, can someone please correct me and explain the intrinsic mechanism
of altitude correction. There is just so much handwaving
regarding this altitude compensation business, it would be welcome by
hundreds of Rotax owners at least.
Cheers,
Ira N224XS
irampil@notes.cc.sunysb.edu wrote:
>
> At 8000' MSL ambient pressure is 73% roughly of sea level.
> That's 30% wasted gas and decreased HP output and sharply
> decreased range.
See HKS' web site, as they use the same carb on their engine:
www.hpower-ltd.com/pages/common_questions.htm
They state that the constant depression carb as used on the 912 can effect
50% of required mixture adjustment up to 10,000 ft. If correct, the
negative effect at 8K would not be so bad. That's before considering
there's a cube root in the equation which relates horsepower to velocity,
so it seems mostly a fuel economy issue.
Regards,
Fred F.
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