Greg=85I believe that conceptually, the tinnerman washer is designed to
fit into a chamfered hole somewhat larger than the diameter of the
fastener=85this will automatically bring the perimeter surface of the
washer down to the surface of your cowl.
I take it that when you use the word, =93flush=94, this is what you
mean, given that the thickness of the tinnerman is so very thin.
If, on the other hand, you=92re ruminating on whether or not to recess
the entire face of the tinnerman, I=92d venture to opine that you may be
=93overhanging=94.
(Whoops=85sorry=85that was meant to be =93overthinking=94, not
=93overhanging=94.)
I have never examined a stock Europa cowl, but I do believe it is solid
FG, not a foam core sandwich.
Fred
On Aug 21, 2014, at 12:02 PM, Greg Fuchs <gregoryf.flyboy@comcast.net>
wrote:
> Just a quick addition here:
> One reason for the question of whether the tinnerman sits on or flush
to the surface is to get the thickness of material between the two sides
of the fastener just right. It seems to work best at just the proper
thickness. Any changes later would require re-doing the receptacle,
requiring a lot of time. It might be an easier question to answer if I
knew the cowl was built up with layers of glass only. Any less-dense
filler between the inner and outer layers might compromise strength in a
rebated but flush-set fastening system. With the cowl being all white,
there is no way to see through. It seems to be all glass..I just cannot
tell for sure, especially with some dimpling being seen around the
clecos. I'd like to start placing fasteners today or tomorrow..
>
> The Europa is quite a clean aircraft aerodynamically, with nice sleek
lines and smooth skins, so I was envisioning an all-flat cowl fastening
system (similar in concept to a flush-fitting screw head), but I have
been told on occasion, that I am 'overthinking' something.
> Maybe this is one of those times?
>
>
>
> From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Greg Fuchs
> Sent: Thursday, August 21, 2014 3:44 AM
> To: europa-list@matronics.com
> Subject: Europa-List: Tinnerman washers on cowling
>
>
> 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?
>
>
>
>
>
|