Author: "sam_mourning" <sammourning@...> Time: Wed Aug 20, 2003 8:33 pm PDT Link
Howdy all.
Thanks to those who helped me out with my step kit question...and now,
for the next one.
This one pertains to the bottom of the fuse, where the bottom skin
rivets to the main spar carry through.
My manual says to machine countersink the bottom fuse skin and forward
F904 bulkhead flange together, only at the points where the forward
floor stiffeners intersect the forward F-904 bulkhead. (For those who
don't carry a set of plans with them at all times, the F-904 is the
main spar carry-through...the gold anodized thing that shipping
companies like to mangle and that cost $570.00....yeah, that's the one).
It's obvious that rivets will go through the bottom fuse skin, F-904
flange and floor stiffeners at those points, but why machine
countersink those. The manual says something about a smooth surface
making things easier at these junctions but I'm just not getting it.
Why not just machine countersink the F-904 flange, dimple the skin and
be done with it?
Any insight would be appreciated.
Thanks
Sam.
Author: Cameron Kurth <cameronkurth@...> Time: Wed Aug 20, 2003 9:42 pm PDT Link
You fit the angle on the bottom skins after a good
portion of that area is riveted together. It would be
difficult to fit the angles if they are being held up
off the skin because the dimple on the center spar was
pushing it up. As far as why not countersink all of
that, personally I prefer to dimple whenever possible,
everthing just seems to fit better.
Cam
--- sam_mourning <sammourning@e...> wrote:
> Howdy all.
>
> Thanks to those who helped me out with my step kit
> question...and now,
> for the next one.
>
> This one pertains to the bottom of the fuse, where
> the bottom skin
> rivets to the main spar carry through.
>
> My manual says to machine countersink the bottom
> fuse skin and forward
> F904 bulkhead flange together, only at the points
> where the forward
> floor stiffeners intersect the forward F-904
> bulkhead. (For those who
> don't carry a set of plans with them at all times,
> the F-904 is the
> main spar carry-through...the gold anodized thing
> that shipping
> companies like to mangle and that cost
> $570.00....yeah, that's the one).
>
> It's obvious that rivets will go through the bottom
> fuse skin, F-904
> flange and floor stiffeners at those points, but why
> machine
> countersink those. The manual says something about
> a smooth surface
> making things easier at these junctions but I'm just
> not getting it.
>
> Why not just machine countersink the F-904 flange,
> dimple the skin and
> be done with it?
>
> Any insight would be appreciated.
>
> Thanks
> Sam.
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