Today's Message Index:
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1. 08:17 AM - Corner rib center fuselage question (Bob Collins)
2. 11:00 AM - Re: Corner rib center fuselage question (Bob Collins)
Message 1
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| Subject: | Corner rib center fuselage question |
--> RV7-List message posted by: Bob Collins <bcollins747_1999@yahoo.com>
I 've stared at the plans and viewed the Web sites
and I'm not convinced I'm seeing things right on
trimming the corner rib (I think it's F-723) forward
part where it mates with the 705 bulkhead.
On the drawings, it appears to show that both forward
flanges are trimmed maybe 3/4 of an inch or so and
tapered aft. This would appear to include the little
joggle section of the outboard flange. However the
fact there's a joggle there tells me that it's there
for a reason and that reason is not to cut it off.
However, in fitting the rib to be flush with the
outboard edge of the bottom skin, that flange --
whether it gets tucked inside the 705L flange or put
to the outside of that 705L flange (which I assume it
doesn't because that would put a nice bump in the
skin), pushes the rib inboard from the corner edge of
the bottom skin slightly. You couldn't get it flush.
So the instruction say get it flush with the botom
skin, best done if that front of the flange of the
corner rib is gone.
However I've seen at least one Web site in which it
was the inboard side of the flange that got cut away
(and not tapered, either) while the outboard side
(with the joggle) stayed as presented. And THAT
confuses me too, because that flange doesn't appear to
be interfering with anything.
As many have noted, the plans are very vague here, and
I'm sitting here with a drill and snips ready to go.
so hurry up and put me on the right track ! (g)
Bob Collins
St. Paul, Minn
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Message 2
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| Subject: | Re: Corner rib center fuselage question |
--> RV7-List message posted by: "Bob Collins" <bcollinsrv7a@comcast.net>
Ok, let me answer my own question here for purposes of the archives. Maybe
it'll help someone else. After looking at the plans again and after fitting
the piece (the corner rib), it is clear that what the plans are showing is
correct. BOTH the web of the corner rib (at least the front portion and I
suspect the aft portion too) and the inside flange of the corner rib have to
get cut off. This is counter to some of the stuff I read on a few builders
sites.
Here's why:
It's obvious when you fit the piece that this is done for two reasons.
First, if you don't cut the front portion of the flange off, you can't
align the edge of the corner rib to be properly flush with the edge on the
bottom center section skin. What's more, if you leave the flange on, you
cannot properly fit the F-723A piece onto the Web of the corner rib.
Now the web portion gets cut off because if you don't, it will go up and
over the flange on the bulkhead, leaving a small gap between the skin and
the bottom of the corner rib. And if you look at the other ribs next to it,
you can see how they've addressed that. Then, using the F23A allows a flush
mating with the corner rib and the bulkhead here, allowing the skin to rest
evenly across the bulkhead and the corner rib.
Many have noted -- correctly -- that the plans aren't very clear in this
regard. First, they show up and forward, but they don't show inboard and
outboard. Secondly, a top view of this piece would've eliminated any
confusion.
But maybe nobody else was confused in the first place. (g)
>I 've stared at the plans and viewed the Web sites
>and I'm not convinced I'm seeing things right on
>trimming the corner rib (I think it's F-723) forward
>part where it mates with the 705 bulkhead.
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