17-05-2013, 10:57 AM
Mounting the wing on the fuse:
The original design called for a single 4mm dowel at the leading edge which went through the Leading edge timbers of the built up wing. I decided to change things; I had to because I’m using a foam core wing with no timber leading edges. The idea of a single 4mm dowel glued into foam didn’t appeal to me very much, this Dynamite will be going a lot faster than the original design. so I decided use a piece of ply with two 3/16 dowels. This should be strong enough.
The wing needs to be a pretty nice fit because it must be removed to change batteries. It needs to go back in precisely the same place to avoid altering the trim of the model between flights and I expect it will be removed and replaced many times.
This is what I came up with, Once the plate with the dowels is nicely trial fitted to the fuse It is then put in place with cling film underneath. The beauty of cling film is that nothing sticks to it. You’ve gotta love that !! I use it all the time.
A nice light adhesive bog is prepared using west systems epoxy and microlite filler, a little micro fiber blend filler is also added for extra strength. The resulting bog is very light, easy to sand or carve and also quite strong. When preparing bog like this I keep a little mixed resin with no filler over to prime the surfaces with and ensure the best possible bond.
Then it's just a matter of priming the area to be bonded by painting some reisn that I kept aside from making the bog and putting the wing on nice and straight. a small fillet of bog fairs in the top of the wing as well.
The original design called for a single 4mm dowel at the leading edge which went through the Leading edge timbers of the built up wing. I decided to change things; I had to because I’m using a foam core wing with no timber leading edges. The idea of a single 4mm dowel glued into foam didn’t appeal to me very much, this Dynamite will be going a lot faster than the original design. so I decided use a piece of ply with two 3/16 dowels. This should be strong enough.
The wing needs to be a pretty nice fit because it must be removed to change batteries. It needs to go back in precisely the same place to avoid altering the trim of the model between flights and I expect it will be removed and replaced many times.
This is what I came up with, Once the plate with the dowels is nicely trial fitted to the fuse It is then put in place with cling film underneath. The beauty of cling film is that nothing sticks to it. You’ve gotta love that !! I use it all the time.
A nice light adhesive bog is prepared using west systems epoxy and microlite filler, a little micro fiber blend filler is also added for extra strength. The resulting bog is very light, easy to sand or carve and also quite strong. When preparing bog like this I keep a little mixed resin with no filler over to prime the surfaces with and ensure the best possible bond.
Then it's just a matter of priming the area to be bonded by painting some reisn that I kept aside from making the bog and putting the wing on nice and straight. a small fillet of bog fairs in the top of the wing as well.
“The knack of flying is learning how to throw your machine at the ground and miss.”
"When once you have tasted flight, you will forever walk the earth with your thoughts turned skyward, for there you have been, and there you will always long to return." ~Leonardo Da Vinci