Bill, a heads up on the Hirth: A local guy here in North Carolina has been
running the 65 hp one with fuel injection since last year on his Rans S12,
now has around 125 hours on it and I heard today that the crankshaft went
up! Hirth seems to be unable to overcome persistant problems, and no matter
what the company says about how good they are now, be CAREFUL. Not trying
to scare anyone, but I personally don't think they are anywhere near the
reliability of the tried and true Rotax. Its too bad as it is a good
looking engine, lighter than comparable Rotax, and his put out the power;
the Rans with 2 people got off the ground in a hurry. Maybe someday
someone will come up with an afordable 4-stroke.
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At 12:43 AM 6/25/00 +0000, you wrote:
-----Original Message-----
From: <xair@...>
To:
X-Air_Ultralight_Aircraft@...<X-Air_Ultralight_Aircraft@...>
Date: Saturday, June 24, 2000 11:06 PM
Subject: Re: [X-Air_Ultralight_Aircraft] X-AIR CENTRAL Re: Questions
about the Xair F
Bill Magrini wrote: Thanks Michael, 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 But
I should check them out. 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 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. Finally - where is your ASI pickup
located this is also very important. It is not exactly
parallel with my flightpath. It is pointed up about 15 degrees.
Again, thanks loads for your help, Michael
