>You can't use taper pins, they will distort the tube and that will cause
>friction in the bearings.
Graham - never say never ... John Scott at Cambridge told me he has
fitted AN taper pins to at least one Europa in place of the original
1/4" parallel pins (TP14A & TP14B). This builder was among the folk
who observed that the holes in the torque tube were not very snug on
the original pins from day 1, and John's change was made before the
torque tube entered service. I certainly felt that my own fairly
cautious reaming of the holes for the replacement 3/8" pins (TP14C &
TP14D) gave a better fit than the original. John's taper pin approach
seems better engineering and I'm not convinced that if correctly
fitted they will cause distortion. If I'd heard of it sooner I'd have
gone for that myself rather than the 3/8" pins.
>Only alternative I can think of is expandinhg pins
That also seems quite neat; but how do expanding pins avoid the
distortion problem you fear with taper pins?
regards
Rowland
--
| Rowland Carson PFA #16532 <http://home.clara.net/rowil/aviation/>
| 750 hours building Europa #435 G-ROWI e-mail <rowil@clara.net>
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