Today's Message Index:
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1. 09:20 AM - 7F3-2 Installation of Longeron Doubler (Perry Delano)
2. 12:36 PM - Re: 7F3-2 Installation of Longeron Doubler (Keith Ashcraft)
3. 02:14 PM - Re: 7F3-2 Installation of Longeron Doubler (pdelano@telus.net)
Message 1
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| Subject: | 7F3-2 Installation of Longeron Doubler |
Hi All,
I am a bit confused with the building manual for installation of the
Longeron Doubler, 7F3-2. The skin is pre-drilled and the longeron has been
back drilled to it. The doubler as it comes from Zenith is not pre-drilled.
1. I cannot figure out the purpose of the reference line, and if I
could Cleco the doubler to the skin that would mean I'd have drilled the
doubler and the job would be done??
2. Also Because the bottom skin has a bit of a convex curve to it if I
remove the clecos holding the forward section of the longeron to the skin it
springs away from the skin edge.
I have thought of drilling, countersinking and putting a couple of blind
rivets in the skin to hold the longeron in place and then installing the
doubler, but I don't think that was the intention.
I believe I can clamp the doubler to the longeron with the piece of 0.016
sandwiched between them, and then having made a reference mark on th skin
push the clamped assembly to this reference point and drill the holes in
the doubler, but
there would be a tension on the assembly which could result in oval holes or
miss drilling especially when back drilling the doubler through the skin and
longeron. ????
Any advice would be appreciated.
Regards,
Perry
Message 2
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| Subject: | Re: 7F3-2 Installation of Longeron Doubler |
Hi Perry,
I'm not sure I can remember back to that portion, but.... Also remember that the
SIDE skin will also get put between the doubler and longeron. I think this is
the piece of .016" material they are talking about. Just make sure it is just
a spacer and not pushed down into the bend of the longeron. I think you are
on the right track, I think when I had things lined up, I then sandwiched the
pieces between a scrap piece of wood screwed down to the work bench, and then
finished drilling #20s in the correct places. Oh wait......I just saw it.... I
don't know how I would go about it because the skin is pre-drilled.... I am scratch
building so I drilled my own holes as a unit.
I guess go with the clamping thing then turn it over and back drill through the
doubler. The Photo guide might have been made before they put out pre-drilled
materials.. It shows 04/2003, so I'm not sure when they started kits with pre-drilled
holes.
I think as long as things don't move, and are fixed as a unit, I think your drilling
should be OK.
Keith
building my spars
plane progress so far: https://picasaweb.google.com/ch701builder
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On Thu, 8/13/15, Perry Delano <pdelano@telus.net> wrote:
Subject: Zenith701801-List: 7F3-2 Installation of Longeron Doubler
To: zenith701801-list@matronics.com
Date: Thursday, August 13, 2015, 10:19 AM
Hi All, I am a bit confused with the
building manual for installation of the Longeron Doubler,
7F3-2. The skin is pre-drilled and the longeron has
been back drilled to it. The doubler as it comes from Zenith
is not pre-drilled.
1.
I cannot figure out the purpose of the
reference line, and if I could Cleco the doubler to the skin
that would mean Id have drilled the doubler and the
job would be done??2.
Also Because the bottom skin has a bit of a
convex curve to it if I remove the clecos holding the
forward section of the longeron to the skin it springs away
from the skin edge. I
have thought of drilling, countersinking and putting a
couple of blind rivets in the skin to hold the longeron in
place and then installing the doubler, but I dont
think that was the intention.
I believe I can clamp the doubler
to the longeron with the piece of 0.016 sandwiched between
them, and then having made a reference mark on th skin push
the clamped assembly to this reference point and drill
the holes in the doubler, butthere would be a tension on the
assembly which could result in oval holes or miss drilling
especially when back drilling the doubler through the skin
and longeron. ????
Any advice would be appreciated.
Regards,
Perry
Message 3
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| Subject: | Re: 7F3-2 Installation of Longeron Doubler |
Thanks Keith, I just clamped everything down and together, I think like you were
suggesting. Cofirmed longeron and skin holes were cocentric c/w .016 spacer
and drilled. All still looks good and in hindsight the final holes have to go
to 5/32 so any minor sub mm misalignment would get cleaned up. Thanks again.
Perry
Sent wirelessly from my BlackBerry device on the Bell network.
Envoy sans fil par mon terminal mobile BlackBerry sur le rseau de Bell.
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