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jbhart(at)onlyinternet.ne
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 Posted: Tue Aug 12, 2008 7:32 am Post subject: safety experiment |
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Date: Mon, 11 Aug 2008 14:23:46 -0700 (PDT)
From: william sullivan <williamtsullivan(at)att.net>
| Quote: | Roger- You hit the nail on the head. I was given to understand that the ASI would not work at lower air speeds (turns out mine didn't work at all), so the only frame of reference would be a comparable ground speed. This would apply only in a low or no wind condition.
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Bill,
I believe you have been very lucky in your quest to fly. But no one should try to fly with out a working ASI and one should never use ground speed as a reference any where in the landing process. Too many have dropped it out of the sky on downwind and/or turning downwind to base and good share of these have died. Believe and use your ASI.
Jack B. Hart FF004
Winchester, IN
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williamtsullivan(at)att.n
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| Posted: Tue Aug 12, 2008 8:42 am Post subject: safety experiment |
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Jack- Do you, or anyone, have a method to ground check an ASI to see if it functions? When I purchased the Kolb I was told that it was about 20mph off. I found the pitot hose had fallen off, and thought that was it.
Bill Sullivan
[quote][b]
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jbhart(at)onlyinternet.ne
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| Posted: Tue Aug 12, 2008 9:07 am Post subject: safety experiment |
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Date: Tue, 12 Aug 2008 09:41:12 -0700 (PDT)
| Quote: | Jack- Do you, or anyone, have a method to ground check an ASI to see if it
functions? When I purchased the Kolb I was told that it was about 20mph
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off. I found the pitot hose had fallen off, and thought that was it.
Bill,
If you can wait a day or two, I will put up a page on how to inexpensively
check out the ASI and altimeter.
Jack B. Hart FF004
do not archive
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Tue Aug 12, 2008 9:09 am Post subject: safety experiment |
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At 12:41 PM 8/12/2008, william sullivan wrote:
| Quote: | Jack- Do you, or anyone, have a method to ground check an ASI to see if
it functions? When I purchased the Kolb I was told that it was about
20mph off. I found the pitot hose had fallen off, and thought that was it.
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Gently blow *at* the pitot tube from a few inches away and see if the
needle moves. Do NOT actually put your lips on the tube and blow into it
as you will destroy the instrument. It won't check it for accuracy, but it
will probably be consistent, i.e. if you try a few stalls at a safe
altitude and it says you're stalling at 50 mph, it'll still stall at an
indicated 50 on landing.
If it's 20 mph off it's probably a bad static air supply. Mine was, when I
bought it... the static air wasn't connected to anything, it just vented
inside the instrument pod, so I could make the reading change by 20mph or
so just by moving my foot. I've since made a concentric pitot/static tube
and it's much more accurate now.
-Dana
--
I'm as confused as a baby in a topless bar.
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herbgh(at)nctc.com
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| Posted: Tue Aug 12, 2008 3:01 pm Post subject: safety experiment |
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The net should have instructions for using a water manometer to calibrate your asi..I think, that over the years, Sport Aviation and Kit planes have printed instructions...Herb
At 11:41 AM 8/12/2008, you wrote:
[quote] Jack- Do you, or anyone, have a method to ground check an ASI to see if it functions? When I purchased the Kolb I was told that it was about 20mph off. I found the pitot hose had fallen off, and thought that was it.
Bill Sullivan
[b]
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