REFLECTOR: firewall placement
Steve Goldman
steve at fatcatair.com
Sun Dec 24 13:15:40 CST 2006
I expect that this question might get a laugh from long time builders
but I'd rather be safe than sorry.
I've been working on laying out my fuselage and when I placed my
firewall bulkhead and got it plumb and square I went to drill out the
index marks the factory put in the fuselage. Well the two lateral
marks pretty much go thru the center of the flange. The centerline
index just misses the front of the flange. I checked my longitudinal
level (for the 20th or so time) and it is per the manual. So I just
drilled a hole that hits the flange center. Now I'd chalk that up to
every thing be "approximate" but the other cause for concern is that
the cowl cut line is not parallel to the firewall either. It is "off"
in the same direction (and similar magnitude) as the index marks. If
the factory uses the index marks to draw that line it make perfect
sense. Anyhow I just thought I'd see if I should trust my leveling or
if the index marks being off should give me pause.
[ I had another wtf moment while positioning the bulkheads. (I
suspect there are dozens of these for every "builders moment. :-) When
I looked at the distance from where the foam transitions to front of
the gear bulkhead the space is different by about 1.5 inches. That
took me back as I couldn't believe I was that much out of square. So I
measured from the nose to the end of the foam and not too surprisingly
it was the foam that isn't symmetric. ]
--
Steve Goldman
'77 Tiger N28531
Velocity XL5-RG (T-3420hrs)
Pittsboro, NC (9NC8)
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