alpinelakespilot2000
Well Known Member
The center section is really where Van's really leaves you on your own (and the drawings don't seem to be helping in this case)...
Ref: dwg 16--
The F-904M web stiffener (that goes on the back of the fwd center section web) calls for flush rivets to attach the stiffener to the web with the flush heads fwd (so that the cover support rib can sit flush on the forward side of the web). The call out is for 426-4-5 rivets. However, the fwd center section web that must be countersunk is only (as best I can tell with my calipers) about .040" thick. Since the minimum c-sink thickness for 426-4's is .050", what gives? If it would have called for 426-3's, I wouldn't have thought twice but a 426-4 really seems too big for countersinking in this case.
I assume the 7 uses the same web stiffener/center section set-up so if any -7 builders have encountered this issue I'd sure appreciate their help as well.
Thanks.
Ref: dwg 16--
The F-904M web stiffener (that goes on the back of the fwd center section web) calls for flush rivets to attach the stiffener to the web with the flush heads fwd (so that the cover support rib can sit flush on the forward side of the web). The call out is for 426-4-5 rivets. However, the fwd center section web that must be countersunk is only (as best I can tell with my calipers) about .040" thick. Since the minimum c-sink thickness for 426-4's is .050", what gives? If it would have called for 426-3's, I wouldn't have thought twice but a 426-4 really seems too big for countersinking in this case.
I assume the 7 uses the same web stiffener/center section set-up so if any -7 builders have encountered this issue I'd sure appreciate their help as well.
Thanks.
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