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Europa-List: Tinnerman washers on cowling

Subject: Europa-List: Tinnerman washers on cowling
From: Greg Fuchs <gregoryf.flyboy@comcast.net>
Date: Thu, 21 Aug 2014 03:43:32

Hi Gang,

I am in the process of checking different methods to mount the Southco
fasteners onto the cowling as per the mod. It's definitely a bit more work
to get them properly in place in comparison to the stainless
screws/nutplates. Hopefully, the time spent now will come back later when
removing the cowling a bunch of times.  
I have a quick question..

After countersinking the outer cowling to accept the center area of the
tinnerman washers, is the outer surface of the washer meant to be proud of
the cowling surface, or are they meant to sit flush? Though it may not cause
too much drag, wouldn't it make sense to countersink the whole washer, or am
I over-thinking it?
If they are meant to be proud, has anyone set them flush and how did that
work out? 

Also, I notice that the fasteners don't sit quite flat to the face of the
tinnerman whereas the screw sat perfectly flat. Now I am going to have to
look into re-shaping the head on the fastener, or the bowl in the washer.
There's always something lurking around every corner to soak up my build
time.. 

Greg


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