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asarangan(at)gmail.com
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 Posted: Mon Sep 02, 2013 7:38 pm Post subject: Spar socket hole enlargement |
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The manual says to open up the port spar socket hole to 1" on one side
only, presumably the side facing the seatback. So why not the other
side? If the sockets are non structural, it would seem odd to sandwich
its plate between the bolt head and the spar bushing. What am I
missing here?
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craigb(at)onthenet.com.au
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| Posted: Tue Sep 03, 2013 12:51 am Post subject: Spar socket hole enlargement |
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I believe the only reason for opening the hole to 1 inch is so it's a neat
fit over the bushing in the spar itself
That socket is the one with the pip pin installed in it which is supposed to
be packed with washers so the pin doesn't move around guess the logic is you
would just have to pack the pin more if you remove both sides out to one
inch, as you say, though the consensus is that these pins are not
transmitting any lift load, however before the strap around the spars was
added, the pip pin would be stopping the end of the starboard spar moving
rearward under those high lift high drag scenarios that were discussed at
length a month or so ago by everyone when the wing is trying to move
forward, which is why I believe the tie bar was added. So this may be one of
those things that hasn't changed because it doesn't really effect anything
in a bad way if its not altered. So you could probably remove it if you want
to, the manual is quite clear the sockets are NOT structural, just a rigging
aid to help you get the wings on. Feel free to correct me Bud if I got this
all wrong
Regards
craig
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richard collings
Joined: 08 Jul 2011
Posts: 73
Location: warwickshire england
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| Posted: Tue Sep 03, 2013 5:00 am Post subject: Spar socket hole enlargement |
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Hi Its very important to get the spar socket mounted in the right position,
to do this rig the wings on to the fuselage and glued the spar sockets in
place. The spar pins hold the whole lot in position on the 0.5 inch hole.
The opened up side of the socket faces the seatback as a clearance hole is
required so as not to interferer with the seat back bushes. Be very careful
not to get excess glue onto the spar I covered mine with brown case tape to
be sure. When the glue has gone off de-rig the wings very carefully and then
add a generous glue fillet round the glue joint and re-enforce it with 3 ply
of bid.
Good luck Richard
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asarangan(at)gmail.com
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| Posted: Tue Sep 03, 2013 10:10 am Post subject: Spar socket hole enlargement |
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Craig
I guess I don't understand the logic behind this setup. As I
understand, the pip pin is there to prevent aft movement of the spars.
So why is the pin only used on the port side and not the starboard
side?
Later on we bond a hardened steel washer to the port socket to retain
the pip pin ball. This sounds structural to me, but I know the socket
is nonstructural, so I am obviously missing something here.
On Tue, Sep 3, 2013 at 4:50 AM, craig <craigb(at)onthenet.com.au> wrote:
[quote]
I believe the only reason for opening the hole to 1 inch is so it's a neat
fit over the bushing in the spar itself
That socket is the one with the pip pin installed in it which is supposed to
be packed with washers so the pin doesn't move around guess the logic is you
would just have to pack the pin more if you remove both sides out to one
inch, as you say, though the consensus is that these pins are not
transmitting any lift load, however before the strap around the spars was
added, the pip pin would be stopping the end of the starboard spar moving
rearward under those high lift high drag scenarios that were discussed at
length a month or so ago by everyone when the wing is trying to move
forward, which is why I believe the tie bar was added. So this may be one of
those things that hasn't changed because it doesn't really effect anything
in a bad way if its not altered. So you could probably remove it if you want
to, the manual is quite clear the sockets are NOT structural, just a rigging
aid to help you get the wings on. Feel free to correct me Bud if I got this
all wrong
Regards
craig
--
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ptag.dev(at)talktalk.net
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| Posted: Tue Sep 03, 2013 10:52 am Post subject: Spar socket hole enlargement |
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Hi! Andrew,
The washer/washers are bedded to take up any slack on the back of the
starboard spa tip and canister So contributing to retaining the Starboard
spa close secured to the Port Spa. The Starboard Spar is retained close to
the centre of the port spa by laying up the "cuff" surrounding the two spas
in the middle . The choice of a plain main pin on the starboard side would
have been to do with reducing cost but in any case since the wings fail
FORWARDS it is not so vital to retain the starboard spa from migrating aft
when it is close to the wing close out but it's tip will tend to be parted
from its mate..
Many have purchased an additional pip pin to remove any uncertainty which
pin goes where !
Hope this helps ? But spoken from a pure layman ........with two pip pins !
Regards
Bob Harrison G-PTAG (Was it you who was sending me some pictures of main
gear spats which are hinged to fold upwards?)
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