Today's Message Index:
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1. 05:07 AM - F887 main longerons (Greg@itmack)
2. 01:27 PM - Re: F887 main longerons (Ted P Utley)
Message 1
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| From: | "Greg@itmack" <greg@itmack.com> |
| Subject: | F887 main longerons |
--> RV8-List message posted by: "Greg@itmack" <greg@itmack.com>
Hi all, I just finished bending and twisting the longerons and attaching them
to the jig with the bulkheads. I find that the longerons bow out at the F804
and I have to clamp them to stay on the WD802, the longerons want to sit about
an inch or two out from the WD802. Using a straight edge between the F807 and
the firewall the F804 does not line up. It's as if the F804 was too wide.
My understanding is that the longeron should be a straight line between the F807
and the WD802 but mine have a slight curve mostly forward of the F804 is this
normal or have I got a problem? I have checked the distance from the firewall
to all of the bulkheads at least 3 times so I don't think the problem is there
and the F806 floor structure fits in okay and everything is centred (the
bow is on both sides).
Greg
Message 2
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| Subject: | Re: F887 main longerons |
--> RV8-List message posted by: Ted P Utley <tpu2@juno.com>
Greg, the best advice I had, and eventually took, was to tape a 10 ft or
so string (straight line) to the shop floor. I then marked the long's
and string with marks where the bends were to occur. Use a tape to
measure in from the line, and up from the floor to get a "3d"
measurement. The plans had some pretty good dimensions (I think) for the
bends. After a few tries, the longs fit pretty well. I still ended up
with a slight bow along the cockpit rails, but the rails riveted on fine,
and now you can't tell.
I don't think its probable that your F804 is too wide.
From your post, it sounds like you're trying to make one bend at the 807.
This bend should be enough to form the straight line from the 807 to the
804. The tricky part is the next bend/twist. Just fwd of the 804 flange
the long's will have have another bend to the 802s. Make sure you have a
twist that matches the 802 weldment. The twist will go aft almost all
the way to the 807s. If you look at the cockpit rails, you can see how
they lay on what will eventually be your longerons. Notice how the rails
become flat just fwd of the 807s. Ideally, the longs would match that.
I can assure you from looking at others, and building mine, alot of them
are gonna be off a little. It could be a problem if it was extreme, when
you install the canopy rails. Hope this helps a little. BTW, nothing
during the fuse construction perplexed me more than bending the
longs.....
Ted Utley
8A wiring/plumbing
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