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<< Lancair Builders' Mail List >>
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In a message dated 10/3/00 0:25:34 AM EST, lancair.list@olsusa.com writes:
<< The question is now should I install a second static port or an
alternate air source in the panel. I am inclined to do the latter and am
looking for a suitable port that is professional looking and
reliable. Your thoughts on this question and where it can be obtained
would be helpful. >>
I had thought that we had two static ports on the two-place Lancairs to (1)
even out position errors when there was a sideslip on the airplane and (2)
provide redundancy if one port were to be plugged.
The manual is quite specific about where the static ports should be located.
Great effort (well, some effort, anyways, ranging all the way from CFD
analysis and wind tunnel testing at the top end down to trying several
locations are seeing what works at the bottom end) is spent on determining a
point on the airplane where the local static pressure matches the ambient
static pressure throughout the flight envelope. Lancair has done this for us
and we should follow their recommendations. It's in the manual.
One could plumb in an alternate air source, or simply reach behind you and
yank the tube from the sidewall fitting if truly desperate (of course, that's
harder to do when a hose clamp is on it). I'd put my effort into a moisture
trap before I worried about alternate air. If you were really slick, you
could have a valve behind the seat which empties the moisture trap and also
lets the alternate air in. Put it on your preflight checklist and you'll
dump any water every time you fly.
I have neither a second static port nor an alternate air source in my humble
IFR Cessna 150 and have never felt at risk. They say I'm to break the glass
on the VSI but I'd probably cut a finger artery and bleed to death on the
approach, so I'm not gonna do that. (Now I'll stand back and listen to all
the guys who have had static port problems and see what they say....)
- Rob Wolf
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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