In mounting the quick connect bellcranks to the wing, I found that the port
bolt seems too short unless the counterbore is substantially deeper than the
5mm specified. I calculate the bolt lengths required as follows:
Port Stbd
Spar 1.256 1.276 Includes 3 layers of bid added
each side
S03 1.273
3 Washers .173 .173
BC4W10 .560 .560
Nut .210 .210
2 Threads .050 .050
-.200 -.200 Counterbore reduces length
required
------ -------
3.322 2.069
The bolts supplied were: port = AN4-31A, stbd = AN4-20A. The port bolt
supplied is 0.2in shorter than I expected while the starboard bolt agrees
with the calculated length. In practice, the starboard bolt is fine and the
port bolt does not go all the way through the nut. The manual indicates that
the port counterbore may need to be slightly deeper that the starboard
counterbore, possibly to accommodate this.
So, has anyone else run into this? I am hesitant to double the depth of the
counterbore since this seems more than "slightly" deeper. Bob Berube says I
am the only one who has called about this (probably because I am a first time
builder so I don't have a sense of what might cause trouble later so I try to
err on the side of conservatism).
In the same area, what is the typical clearance between the bolt ends holding
the wing mounted bellcrank vs the CS14 mounted bellcrank? I have less than
0.1in on the stbd side. Might these come in contact as the wings are inserted
or will the lift pins prevent this?
John, A044
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