F.L. Whiteley wrote:

The PIK 20 (at least the E model) had one. Same situation, I think: with
pins on the ends of the spar butts, it takes some levering to get every
thing to slide together that last 2-3 mm so the pin can be slid in.



Thought one of the PIK-20 issues was fuselage expansion in warmer. That
above 70F it got very difficult.

I don't know if it was common on PIKs, but can happen to almost any
glider. The most recent one I saw was on a Nimbus 4. The lever on the
PIK wasn't used to overcome the expansion issue, a manufacturing issue,
which usually is fixed by increasing the gap between the wing sockets
and the fuselage pins (or vice versa), as it was on the Nimbus 4.
Sometimes it's just a shim that needs to be removed; sometimes the pin
shoulder needs a few mils machined off of it.


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Eric Greenwell
Washington State
USA