A little bit more done early this morning.
The Wing core’s edges have been rounded and faired down into the tip shape. Three cuts have been put into both cores to take 3 strips of 1.5mm plywood.
The plywood has been carefully shaped so it is dead flush with foam core. Elevators have been marked out so I can position the hinge material in the right place.
Here’s the core, its sitting on the off cuts, kept nicely supported while working on them
I sprayed the core lightly with No77 just around the leading edge and over the top of the plywood strips and ailerons to hold the extra glass firmly in place while I worked on it.
A strip of 4oz cloth about an inch wide, cut on the bias (45% to the weave) was rolled around the leading edge. The No 77 holds it there surprisingly well !! The same sized pieces of Uni-directional glass, as I used on the previous wing, were fixed directly over the plywood strips. No brown paper this time as the finished wing will have 1Oz cloth all over, just under the paint.
The inside of the plastic sheets were painted the usual Red white blue for the top of the wing and then yellow for the bottom. On the back of that Was sprayed a light coat of primer.
Then with the primer still just a touch tacky I laid the plastic sheets, paint side down on some on some 1OZ cloth and cut around the edges of the sheets. The slightly tacky primer held the light cloth against the plastic sheets nicely while I flipped them over and taped the trailing edges together. Tapeing the sheets together at the TE helps them stay nicely aligned. Then they were brushed with West Systems Epoxy and blotted them off with toilet paper to remove any excess resin.
The glass that was held to the core with No77 was also carefully wetted out with epoxy, blotted then whole lot was sandwiched between the plastic sheets, slipped into the Bag and sucked down.
The wing is supported underneath and above, by the off cuts from the foam cores. These are outside the bag, with some weights on top, to hold the whole thing nice and straight while the epoxy cures.
Here’s a pic of the wing in the bag
The cord around the edge of the bag is a wick to let the air out, it helps keep the Vacuum even across the bag. There is a small piece of cloth under the Vacuum fitting to make sure the air can get out easily and it acts as a bit of a filter for the poor old pump as well.
Here it is, as it sits for 10 hours or so waiting to cure.