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Re: Schleicher ASH31 4m
Posted: 02 Dec 2021, 15:09
by MartinE
Apologies Andrew, I used your last name.
Re: Schleicher ASH31 4m
Posted: 02 Dec 2021, 17:24
by MartinE
The tailfin spar, having been bonded with resin, is now very stiff, offering good strength.
The foam was removed and spar placed in.
Re: Schleicher ASH31 4m
Posted: 02 Dec 2021, 17:25
by MartinE
Having finished the top sheeting, the support were sawn off and the formers rubbed down.
Bottom sheeting can now be glued on.
Re: Schleicher ASH31 4m
Posted: 02 Dec 2021, 21:58
by Andrew Ray
No worries Martin. I'll be keeping an eye on this thread now I've found it.
Re: Schleicher ASH31 4m
Posted: 04 Dec 2021, 11:57
by MartinE
More progress on the bottom sheeting - this was more tricky than the top, due to the compound curves.
I've also put together a fuselage stand (from the many ply offcuts I have in the workshop), with some foam edging.
Re: Schleicher ASH31 4m
Posted: 05 Dec 2021, 09:23
by MartinE
After an overnight cure, the tailfin has both sides and the spar bonded on. It weighs 116g and is very strong vertically & tortionally.
The leading edge was filled with a stiff expoxy/micro balloons mix and will be shaped to the correct profile.
Tail plane mounting screw at the top.
Re: Schleicher ASH31 4m
Posted: 06 Dec 2021, 20:39
by MartinE
Skin finished (bar sanding down) and the fuselage comes in at approx. 700g
Couldn't resist propping the tail on!
Re: Schleicher ASH31 4m
Posted: 06 Dec 2021, 20:43
by MartinE
As the front of the fuselage will potentially quite weak, I've lined the inner sheeting with 3mm, high compression, foam. (That will then be glassed on the inside.
Re: Schleicher ASH31 4m
Posted: 13 Dec 2021, 20:31
by MartinE
Where the wings will connect to the fuselage, it's important that the location pins are in line.
I created a jig from an oak offcut - drilled & reamed two 5mm holes, to give a snug fit to 2 carbon fibre rods. Then the brass tubes can bonded to the wing profiles perfectly aligned.
Re: Schleicher ASH31 4m
Posted: 16 Dec 2021, 16:40
by MartinE
Having bonded the foam onto the inside of the balsa skin, a layer 100gsm glass (on the bias) was applied.