At lunch today, welded up the power skid.
There is a good reason why I don't weld for a living. The weight loss would be a bad thing.
Used a spoolgun to weld the skid. Had to make several passes to get a good amount of filler metal on the joints.
Even after clamping it till it was cool, acquired plenty of warping that will need straightened. Engine mounts not exactly lined up.
Might have been a good idea to wait before drilling all the holes. Note to self, if do this again.
3/32" aircraft plywood underneath. These will be the rudders and the elevons, cardstock will never hold up, flutter is a concern, going to mount the rudders as strongly as possible using paper/wood.
Here is a photo
Wingtip is made using balsa wood, and basswood. Balsa is 1-3/4" wide with a 1/4" thick chunk of basswood glued to the end. Will use screws to mount the rudder to the basswood. The wing spars will insert 1/2" inside the larger end rib for gluing to the tip. The cardstock will cover the whole tip being glued directly onto the wood, will add a degree of twist to create the wingwash Don mentioned in a different thread:
In case you might be wondering why the two boxes of tire weights and a black clamp between them is doing in this photo: They are clamping down on the wing spar being glued underneath the boxes total weight used is 33lbs in tire weights. The boxes weigh 9lbs each, have 4-clamps total holding it down as well, they need to be straight and completely glued solid all three layers! This is where the square wood dowel shown above comes in real handy.
Mike