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Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 18:26
by Martin Church
Hi guys I'm slacking with my build of this kit from the new manufacturer.
Seems every time I hit a hurdle it goes to the back of the modelling room till I find a solution.
My latest headache is trying to get the canopy trimmed to perfection. Initially I made a ply base plate & fretted the centre out within around 1/2" of the glazing. I then tried hot gluing the canopy to this but it ended up a mess so I had to rip it all off & start again.
So it's back in the corner sulking again. Anyone any ideas on how best to frame the canopy so I can hinge it as the full size is hinged. I'm not going absolute scale with the rest of it but I'd like to get at least the cockpit & canopy looking good.
Martin

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 19:50
by B Sharp
Hi Martin, perhaps some of my images may be of use to you. When I started on the canopy and frame I quickly decided that a plywood frame was not going to get the best fit. I decided to make a glass fiber frame which turned out to me much easier than I had thought. I covered the whole canopy opening with brown parcel tape the applied glass cloth, chopped strand mat and epoxy till I had a depth approximating 1/4 inch. I started with fine glass cloth and the final layer was the same. Once dry it cracked off easily and was then cut and sanded down to shape. The finished frame fits the fuselage perfectly.
I usually fix my canopies to my frames with evostik contact adhesive. You have to be careful to get the canopy in the right place, but once stuck it is there for good.
Brian. :)

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 20:03
by Peter Balcombe
That sounds like a good method to me Brian.
You are never going to achieve a good fit between a flat ply frame and the slightly curved fuselage canopy frame.
I have always had a small gap under the middle of my PT ASW20 & Vega frames.
I will try the glass cloth method the next time I have a canopy to make on a fuselage like the PT range.
I have always used white canopy glue to attach the glazing as it dries clear, but am not sure how well it sticks to epoxy glass.

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 20:38
by Martin Church
Hi Brian that sounds a better solution
where did you get the materials from?
Martin

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 21:51
by roo Hawkins

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 21:53
by Martin Church
Cheers Roo.

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 22:00
by roo Hawkins
Hi again I all ways make my canopy frame in a sandwich method . a layer of carbon or glass cloth and epoxy and then a layer of balsa or PVC foam and then a layer of glass cloth again. It stops the frame fro flexing and is a lot stronger. ROO :D

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 22:19
by B Sharp
Hi Martin, I have used East Coast Fibreglass Supplies for glass cloth and epoxy resins. They can supply all manner of glass cloth in a variety of weaves and weights. They also supply SP epoxy resin which is perfect for modelling use.
Right now I can’t remember whether I cast up the canopy frame in epoxy resin or polyester resin, to be honest either would work well. However epoxy resin takes longer to set off and the finished product retains a little flexibility. If I used polyester I almost definitely bought it and the chopped strand mat in Halfords.
By the way I was serious about using brown parcel tape as a release coating to cover the area of the fuselage that you are moulding over. Absolutely nothing seems to stick to brown parcel tape other than more brown parcel tape.
Brian. :)

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 22:22
by Martin Church
Cheers Brian
Thanks to everyone for your input
I feel a little more confident to get stuck in
Pardon the pun.
Martin

Re: Teakle ASW 20 3.5/1

Posted: 02 Jun 2016, 22:37
by Cliff Evans
Martin states in his post "Hi guys I'm slacking with my build of this kit from the new manufacturer."

I must add that this is not me!