That analysis assumes the fuselage structure to be inelastic and utterly un
yielding, whilst the spar is privaleged to flex.
All of the vertical loads going in to the lift pins have to pass through th
e fus structure too, which will yield to a greater or lesser extent.
Duncan Mcf.
> On 10 August 2019 at 22:47 Pete <peterz@zutrasoft.com> wrote:
>
>
> What i have never understood, is why the cockpit module spar pin bush
ings are not vertical slots, because when the wings are flexing under G, th
e lift pins take the fuse lift loads, and the spar flexing (under positive
G) actually force the spar pins _downard_ against the cockpit module....o
bviously totally counter-productive.
>
> Pete
> A239
>
> On Aug 10, 2019, at 5:29 PM, Bud Yerly < budyerly@msn.com mailto:budy
erly@msn.com > wrote:
>
>
> > >
> > Fred,
> >
> > Back before my time when mod 52 was done for the GW increase.
The classic had two 3/8 pins originally. Mod 52 uses the =C2=BD inch pins
and a spar strap .
> >
> >
> >
> > As the wings pull forward under load, the fuselage would flex s
o they put in the cross bar and the new sockets.
> >
> >
> >
> > Then the concern was that the starboard wing spar could become
dislodged from the socket and interfere with controls. The quick fix was t
o hold in the spar tip with a pip pin. The port wing was figured would sta
y put, and the spar strap would prevent flexing of the spar.
> >
> >
> >
> > That is all I know. Andy would have the particulars on the det
ailed history. It sort of all makes sense.
> >
> >
> >
> > Best Regards,
> >
> > Bud Yerly
> >
> >
> >
> > Sent from Mail https://go.microsoft.com/fwlink/?LinkId=550986
for Windows 10
> >
> >
> >
> >
> > ---------------------------------------------
> > From: owner-europa-list-server@matronics.com mailto:owner-europ
a-list-server@matronics.com <owner-europa-list-server@matronics.com mailto:
owner-europa-list-server@matronics.com > on behalf of Fred Klein <freddythe
k10@gmail.com mailto:freddythek10@gmail.com >
> > Sent: Thursday, August 8, 2019 1:29:43 AM
> > To: europa-list <europa-list@matronics.com mailto:europa-list@m
atronics.com >
> > Subject: Re: Europa-List: Reaming of spar and CM bushes
> >
> > Budyou mention the use of the SouthCo pip pin on the p
ort side and the Allen bolt pin on starboard.
> >
> > Do you know the reason for using different types of pins here?
> >
> > Is there any downside to using SouthCo pip pins both port and s
tarboard?seems I=99ve heard that some builders have done so.
> >
> > Fred
> >
> >
> > > > > On Aug 7, 2019, at 8:35 PM, Bud Yerly < b
udyerly@msn.com mailto:budyerly@msn.com > wrote:
> > >
> > > The SouthCo pip pin is nominally .4985 inches.
> > > The Allen bolt pin for the starboard side is .497 to .495
.
> > >
> > > > >
> >
> > >
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