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colin.dix(at)bailey-steam
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 Posted: Thu Jan 14, 2010 7:55 am Post subject: Airspeed Indicator reading low, |
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Hello Kitfox List,
I have been following your discussions for a while. I wonder if you can help please. I have a half share in a M44-1200 - Rotax 912. G-BXWH based in the UK.
We have aproblem with the airspeed indicator reading about 10 MPH low, and the Rate of Climb meter is reading low as well. I'm told we have the same arrangment that others have that works correctly. Any ideas where to look for a cure for both please? BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px; }
Regards
Colin
Colin Dix
Bailey Engineering & Design Ltd
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Herefordshire, HR9 5TR. UK.
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Thu Jan 14, 2010 9:55 am Post subject: Airspeed Indicator reading low, |
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At 07:48 AM 1/14/2010, you wrote
| Quote: | We have aproblem with the airspeed indicator reading about 10 MPH
low, and the Rate of Climb meter is reading low as well. I'm told we
have the same arrangment that others have that works correctly. Any
ideas where to look for a cure for both please?
|
Colin,
Check for leaks. I did the trick of putting a 10cm piece of
sealed tube on the pitot and then carefully kinking it while watching
the ASI. (Don't want to over speed it.) Once kinked, hold it in place
with a rubber band or tie wrap and wait to see if the airspeed
decays. If so you've got a leak in the pitot system. My leak was
between the bezel and glass.
Do the same with the static system, except start with a
kinked hose and let it un-kink after sealing it to the static system.
Once you've confirmed no leaks then question the location of
the static port. My system ran 10mph low using the "same arrangement"
as well so I just disconnected the static port and ran it at cabin
pressure: much closer.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 400 hrs. and counting
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Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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Dorsal
Joined: 29 Mar 2008
Posts: 34
Location: MA
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| Posted: Fri Jan 15, 2010 7:26 am Post subject: Re: Airspeed Indicator reading low, |
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Given both airspeed and rate of climb are off in the same direction I believe this points to a static port problem. If my assumption is correct it is not a leak but a a small amount of additional pressure at the static port location, disconnecting and running at cabin pressure , as Guy suggested,may help.
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dave
Joined: 22 Sep 2006
Posts: 1382
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| Posted: Fri Jan 15, 2010 9:21 am Post subject: Re: Airspeed Indicator reading low, |
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some of the Kitofx ASI are notorious for readings........
mine read low --stalls at 27 (some think that is right ? NOPE)
MIne cruises at 105 mph -wrong again about 90 to 92 ..........
I have inside static port ...........
try opening door and see what happens
then stick arm out door and what ASI
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