A single plastic sheet (the outer skin) over the aluminum skin to allow for accurate drilling of the skin. NOTE: the plastic sheet only had a few pilot holes - once mounted to the skin and baffle structure then the holes were drilled.
Tim O'Connor
(502) 235-3801
Mailing address:
2375 East State Road 250
Brownstown, IN 47220
Airport Address 1019 Ave A
Freeman Field
Seymour, Indiana 47274