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1. 06:30 PM - Rib Question (Yeah Another One) (Glenn Thomas)
2. 09:48 PM - Re: Rib Question (Yeah Another One) (Rcaprd@aol.com)
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| Subject: | Rib Question (Yeah Another One) |
--> Pietenpol-List message posted by: "Glenn Thomas" <glennthomas@flyingwood.com>
Hi,
I'm still fiddling the rib jig. I drew it out again on a slightly larger board.
I drew in the spars and braces so I can plan where the clamps will go and ran
into another quandry.
1. Using 3/4" thick spars changes the measurements a little. I placed the aft
side of the leading edge spar and the front side of the trailing edge spar in
the same position the 1" spar would be. I figured the fuel tank dimensions and
others depend on that being 27 3/4" between them. Is that right?
2. The original wing drawings show blocks (wedges) between the spar and the capstrip
on the top of both spars. According to the measurements I've made (and
I double-checked) if the rear spar is 4 3/4" tall, not only will I not need the
spruce blocks, but I'll have to chamfer the top edge of the spar to make it
fit. Am I doing something wrong? Somebody told me there is a low spot in the
plans. I just finished my bending jig so after I steam a piece and set the bend,
I'll put it on the board and see if maybe there is a discrepancy with the
measurements on the plans. I think a low spot will show up with a piece of wood
laying over the drawn measurements. I've seen a couple of exceptions with
the given dimensions so I'm hoping this is just another slight plans error.
Any feedback would be appreciated.
Thanks!
--------
Glenn Thomas
N?????
http://www.flyingwood.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=11742#11742
Message 2
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| Subject: | Re: Rib Question (Yeah Another One) |
In a message dated 2/12/2006 8:31:35 PM Central Standard Time,
glennthomas@flyingwood.com writes:
1. Using 3/4" thick spars changes the measurements a little. I placed the
aft side of the leading edge spar and the front side of the trailing edge spar
in the same position the 1" spar would be. I figured the fuel tank dimensions
and others depend on that being 27 3/4" between them. Is that right?
Glen,
The spar centerline is what should be maintained. I used 3/4" Douglas Fir
Spars, and used 1/8" plywood shims on the front and back sides of each spar,
thus maintaining the spar centerline, (which according to my notes, came out to
be about 28 1/16" to 28 1/8" between the spars). Maintaining the centerline
of the spars keeps the cabane / fuselage attach fittings, and the lower lift
strut fittings all in alignment, thus giving the Pietenpol the unique ability to
adjust the wing for and aft for Weight & Balance.
In leu of the wedge above the front spar, I used a unique kind of an L
shaped gusset there, that took the place of the wedge.
Chuck G.
NX770CG
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