Tony=0Adon't use bondo, it's a polyester resin and doesn't bond to epoxy. A
lso, it's under tension. However, there is an aluminium plate under it bond
ed between the inner and outer skins. It's there to spread the load and som
e of the early ones weren't in the right place. The hole for the lift pin b
olt should be close to the centre of the plate.=0AAre you incorporating the
weight up grade mod? Strongly recommend it, the forward lift load will the
n be taken by the tube=0Aacross to the other side.=0AHave a chat with Kings
ley?=0AGraham=0A=0A=0A=0A=0A________________________________=0A From: Tony
Renshaw <tonyrenshaw268@gmail.com>=0ATo: "europa-list@matronics.com" <europ
a-list@matronics.com> =0ASent: Sunday, 2 June 2013, 14:09=0ASubject: Europa
-List: Trailing Edge Lift Pin Sockets........P.S.=0A =0A=0A--> Europa-List
message posted by: Tony Renshaw <tonyrenshaw268@gmail.com>=0A=0A> Gidday ag
ain,=0AI've already received a private message telling me of other airframe
s with the problem of the lift pin plates being in the wrong place within t
he fuselage moulding. Comment was passed about the suitability of car bog,
polyester based, with our epoxy layups, and the PFA's view of its suitabili
ty under compressive load. Anticipating some negative commentary I would li
ke to make the following respectful comments. Those doubters I'd like to as
k, have you ever tried to remove car bog from something? My lower fuselage
jig is bonded to the floor to keep it level and true. I needed to use a chi
sel and a lot of effort to remove it. Now a chisel is a very concentrated f
orce, and I can guarantee the load exerted by the fuselage facing "face" of
a rear lift pin socket would need an exorbitant amount of force to compres
s an entrapped amount of this polyester resin based filler. Also, once enca
psulated- in 4 plies of BID, whether it sticks to the BId or not, my
belief is it will be there !=0Aforever. I believe there is a greater likel
ihood of it being there in 50 years than plywood. Why didn't Europa use it
as a medium in their manual? I believe because it was possibly overlooked,
and did not have a historical base in aircraft structures. Personally, if i
t is inert, doesn't age or shrink, is easily workable into complex shapes,
or be sanded and shaped into such, I'd be happy with it in my bird, with my
kids on board. So, a bit of a vent really, but I am irritated I have to us
e an in exact method on some preconception it will be better, when I think
it won't. Mind you, Downunder like the US, I am allowed to make structural
modifications. I'm tempted, but my conservative pilot nature brings me here
=- - - - - - - - - - - - - - - -Matt Dralle
========
|