Hi,
The solution worked out by Andy Draper / Barry Mellors was a 2 ply Bid
''donut ring'' around the hole on each rib, [ one side only ], Make the diameter
2'' bigger than the hole.
Get the orientation of each ply 45 degrees apart.
Easy way is wet the two plies on plastic, cut out the discs,stick it on the
smooth side of the rib [ scuff it first ? ! ], when it has cured, drill the
hole.
Main objective was to prevent the rib from '' tearing''.
Start at the root rib half way between the spar and drag pin, at half chord
position, as you work outboard, get lower in the ribs, so the conduit will
pass under the aileron pushrod, then sweep it forward as it goes thru' the last
rib, and Bid the conduit to the end of the spar.
Where it passes thru the double rib, it will be close to the lower skin, the
''donut'' will lap onto the skin itself.
The last two bays are far enough apart that it helps to support the conduit
with a piece of foam, and put a Bid lay up over it ,onto the skin, half way
along.
Scuff and flox the conduit at each rib, I tend to put a Bid tape on the
inside of the root rib, to keep it in place.
Cheers,
Nev.
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