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Gentlemen,
We started out discussing a serious malfunction with our
airplanes, and it’s degenerated to an advertising campaign for certain commercial
products…not only that, but you’ve managed to introduce yet another failure
mechanism for the original problem…a busted window…
Bob
From: Lancair Mailing List
[mailto:lml@lancaironline.net] On Behalf Of David Standish
Sent: Friday, May 07, 2010 8:48 PM
To: lml@lancaironline.net
Subject: [LML] Re: Cabin Door Window-IV-P
This might help.
http://www.brookstone.com/sl/product/49014-n-a-p-luxe-travel-pillow.html
John Hafen wrote:
Are you sure the noise wasn't from dosing off and nodding
forward, hitting the top of your headset on the ceiling -- and hearing a
"thump" in your headset before waking up again?
Happens to me all the time. Found out there's nothing
wrong with the plane.
On May 5, 2010, at 6:24 PM, Colyn Case wrote:
My noise didn't sound like it was coming from the engine.
more like something banging on the fuselage. Just happened 2 or 3
times and then stopped. I had done some carbon work since the last
flight so possibly it was some bubbles popping but it seemed loud for that.
My engine is set up for 45 gph in the climb.
On May 4, 2010, at 4:23 PM, Robert Pastusek wrote:
On the loud banging/popping, could the engine be pre-igniting?
This will definitely cause what you describe, and is definitely not good on it.
Do you climb at full rich mixture? If so, pre-ignition is not likely…but
possible. If you are leaning in the climb, try pushing in the mixture the next
time it happens to see if that corrects it. Also, you can get a pop/bang from
“after-fire” in descent with the mixture rich. This is caused by unburned fuel
being dumped into the exhaust during descent when the engine is essentially
windmilling…not producing much power… The fuel mixture will occasionally ignite
in the exhaust stack causing a definite pop/bang.
You’ve got the old window for asking. I don’t have it out
yet…probably be June as my “real work” is significantly interfering with my fun
these days, but I intend to try to get it out in one piece so I can try to see
where the break started, and why.
According to Ed, the crankshaft failed between the bearing
journal and the prop flange…right in the radius. Ed says you can see a crack
through at least half the material, then the rest “tore off”,
bending/distorting the metal in the process. Don’t know if this was one of the
“bad” Continental cranks that got through the check of a few years ago or not.
The NTSB has the engine and is analyzing now. Expect to hear more about this
when available.
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