Today's Message Index:
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1. 01:11 AM - Fuselage Issue # 2 - Twist on 887 longeron (owner-rv8-list-server@matronics.com)
2. 01:30 AM - fuselage issue #1 - Roll bar width vs 804 a tip separation (owner-rv8-list-server@matronics.com)
3. 01:40 AM - Fuselage Issue # 3 - F827/7 to F842 positioning (owner-rv8-list-server@matronics.com)
4. 06:26 AM - Re: fuselage issue #1 - Roll bar width vs 804 a tip separation (Ken Dominy)
Message 1
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| Subject: | Fuselage Issue # 2 - Twist on 887 longeron |
--> RV8-List message posted by:
For those of you who have not been here yet please note that there is an
error in the fuselage construction instructions.
On page 6-5, it says =93forward of 804A both a bend and a twist are required=92.
Problem is that by doing this, the twist goes from 0=B0 at F-804A to app. 15=B0
at the firewall top weldment. BUT there should already be a twist at 804A so
the twist should be between, 807 and 804B =96 i.e. 0=B0 at 807 and 15=B0 at 804B,
hence no additional twist between 804 and firewall.
Mich=E8le
Message 2
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| Subject: | fuselage issue #1 - Roll bar width vs 804 a tip separation |
--> RV8-List message posted by:
There is a problem in the pre punched dimensions of 804 A/B. When assembled,
the gap may be too wide for positioning the roll bar.
The requirement is that the 887 longerons should be straight between the 807
bulkhead and the firewall weldment. When I did this and put 804 on, I
discovered that the 804A/B cross wise width is too wide by more than =BD=94
which causes the longerons to bend in the horizontal plane substantially
which will prevent the roll bar to be bolted onto the 887 longerons.
The solution I have been recommended is to build on and later, when it is
time to adjust things for the roll bar, to bring in the sides of the cockpit
via a long clamp across the cockpit and then flute the 804A/B webs to absorb
their buckling.
I am currently reassembling things to check whether I should not be doing
the fluting now rather than later.
I have discussed this problem with Van=92s, please feel free to comment.
Mich=E8le Delsol
RV8 Fuselage - SN 81963
Message 3
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| Subject: | Fuselage Issue # 3 - F827/7 to F842 positioning |
--> RV8-List message posted by:
Skins F826/7 have two cross wise aft lines of rivets =96 they attach the
F826/7 skins to the F842 skin and to the F807 bulkhead.
To make a long story short, plans tell you that the match hole is on the
edge line of rivets =96 If you do this, then the F842 will not match the
bulkheads aft, 806, 805=85 to 812. Too match their positions, the match hole
to use is on the inside of the two lines of rivet holes. drawing 28 (F826
bottom view) is wrong.
This is corroborated by the fact that if you do overlap 826/7 to 842 on two
lines of rivets instead of one, the junction is a lot stronger and 842 does
get riveted onto 807 =96 which makes sense. Otherwise the aft part of the
airplane would be held by only one line of rivet and the aft bulkheads would
have to be pushed back from their planned dimensions.
I contacted Vans on this =96 they will modify the plans. Feel free to comment.
Mich=E8le
RV8 =96 Fuselage SN81963
Message 4
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| Subject: | fuselage issue #1 - Roll bar width vs 804 a tip separation |
--> RV8-List message posted by: "Ken Dominy" <abqmooney@excite.com>
I had the same problem with my 8 qb, and another local builder with his standard
kit. My solution was to take the roll bar to a body shop and use a power pack
to expand the roll bar to fit the fuselage as built. It took about 3 inches
of displacement for the roll bar to stretch the 1/4 to 3/8 inch required after
"springback." The flanges of the roll bar did not fit down flush with the
longeron (even worse after the stretch). I could have filled the wedge shaped
gap with somthing, but that would have the two outer surfaces not parallel,
and not suitable for bolting together. I could have made a wedge and placed it
under the bolt heads, but didn't like that idea either. Both of us wound up
bending the roll bar flanges downward with a large cresent wrench. Of course,
the tack welds on the edges broke, but the flanges fit, and we were able to
bolt the roll bars on our aircraft sucessfully.--- On Fri 05/20, owner-rv8-list-server@matronics.com
wrote:
From: [mailto: owner-rv8-list-server@matronics.com]To: rv8-list@matronics.com, RV-8@yahoogroups.comDate: Fri, 20 May 2005 10:29:23 +0200Subject: RV8-List: fuselage issue #1 - Roll bar width vs 804 a tip separation-- RV8-List message posted by: There is a problem in the pre punched dimensions of 804 A/B. When assembled,the gap may be too wide for positioning the roll bar.The requirement is that the 887 longerons should be straight between the 807bulkhead and the firewall weldment. When I did this and put 804 on, Idiscovered that the 804A/B cross wise width is too wide by more than =BD=94which causes the longerons to bend in the horizontal plane substantiallywhich will prevent the roll bar to be bolted onto the 887 longerons.The solution I have been recommended is to build on and later, when it istime to adjust things for the roll bar, to bring in the sides of the cockpitvia a long clamp across the cockpit and then flute the 804A/B webs to absorbtheir buckling.I am
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