Re: X-AIR CENTRAL Re: Questions about the Xair F
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Bill Magrini wrote:
?Thanks Michael,?Your stall is 25 knots?? That is pretty much book.?
Mine is way higher.? I hope we can figure this out.? If it were my
ASI, then the top speeds would be high too. right? Not really..... i have seen an ASI where someone blew into the
end of it only read correct from about 35 to 50 knots over that it would go
up to 90 knots and under 35 it would show about 15, so it can
happen? Does
blowing ruin an ASI?? How hard do you have to blow?to ruin
one??
?
If my revmeter (tach) was reading really low.
then my engine wouldn't start getting hot at 5800 rpm.? But I should
check them out. Your engine should run at max
revs without overheating for a considerable period of time eg? our
503's air cooled will run for over 1 hour flat out 5600 rpm without any
problems, just to try and keep up with the 618's /
582's.? I
too can fly around all day at 5500 RPM.? My engine doesn't start
getting hot until I leave it at 5800 RPM.? It will? go to redline
at 6000 RPM.?
?
I have a digital light tach that I
tried.? It registered 1100 to 1700 RPM when I was showing 3000 on my
engine tach.? I thought the digital tach was wrong. All i can suggest is eliminate the obvious first, replace / borrow
a new tacho and check it out first because overreving the engine will cause
it to destruct, once that's right check the ASI. Use a GPS and fly four
legs, say a big square, go North for say 2 minutes and check your ASI
against your ground speed then turn East and do the same, after completing
the four legs average the ground speed and you have your average taking into
consideration the wind direction by flying all four directions. Do this
three times once at say 40 knots and them at 50 and again at 60 and it will
tell you if its out an a particular range. Otherwise send it to an
instrument tech and get him to check it.? I
flew tonight.? I was able to maintain altitude, just barely at 5000 RPM
indicating 50 mph.? (She started feeling a bit mushy.??It
likes 5200 RPM better.)? On the ground the wind was calm, but at 1000
ft, I could feel?a qyartering tailwind.? GPS indicated 50 and ASI
indicated 48 to 55 MPH.? On the trip back, there was a
quartering?headwind. (with?a considerable?crab angle)?
The GPS indicated 43 mph and the ASI indicated 55 mph at 5200 RPM.?
Finally - where is your ASI pickup located this is
also very important.
My pickup is on the left wing.? It is
not exactly parallel with my flightpath. It is pointed up about 15
degrees.
Again, thanks loads for your help,
Michael
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