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Chris Williams 1/4 Scale T21**
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- Posts: 66
- Joined: 11 Oct 2017, 18:53
- Location: Mitcheldean
Re: Chris Williams 1/4 Scale T21
First two of the fuselage longeron doublers added, ensuring a handed pair!
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- Posts: 66
- Joined: 11 Oct 2017, 18:53
- Location: Mitcheldean
Re: Chris Williams 1/4 Scale T21
I'm leaning towards building the rear section over the plan to create a straight, rigid structure before adding in the main formers and then pulling in the longerons to the nose area.
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- Posts: 66
- Joined: 11 Oct 2017, 18:53
- Location: Mitcheldean
Re: Chris Williams 1/4 Scale T21
More progress this afternoon, all of the cross bracing done, this project is eating spruce and balsa strip!
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- Posts: 66
- Joined: 11 Oct 2017, 18:53
- Location: Mitcheldean
Re: Chris Williams 1/4 Scale T21
I've spent a session dry fitting and comparing to the plan and I think I'm happy with how I'm going to proceed.
The rear end is now clamped in the old trusty SLEC jig and the whole thing positioned over the plan to align the main centre formers.
I've glued in the lower keel and worked out it's vertical position at F1 to set it's height.
Once it's set I'll add in F1, F2 and F3 with the top keel to hopefully create a stable front end. Dry fitting did at least prove that slitting the front portion of the longerons eases the pressure required to form the bends significantly. I did find the lower keel is a little short which obviously puts F1 a tad out if position. I plan to compensate by making the nose block a little longer, more room for the inevitable lead! I also remade F4 in 1/4" ply, partly for strength and partly because the fit of the original wasn't great.
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- Posts: 66
- Joined: 11 Oct 2017, 18:53
- Location: Mitcheldean
Re: Chris Williams 1/4 Scale T21
Now adding the ply sheeting, I've used epoxy for this more added strength, figuring the weight is forward of the centre of gravity.
When the side panels are in position, I'll cut and fit the strut brackets. Plan is to cut them from hard aluminium, but long enough to be one piece right through the fuselage and epoxied to the former.
- SedB
- Posts: 98
- Joined: 14 Nov 2019, 09:17
- Location: Netherlands
Re: Chris Williams 1/4 Scale T21**
Forming the longerons I found the hardest part so far. I really had issues lining all out and forming them to a proper fit. Looks very promising so far Sean!
Wondering how I can add strength to the front part of the glider, I'm curious how yo'll be making those strut brackets!
Daniel
Wondering how I can add strength to the front part of the glider, I'm curious how yo'll be making those strut brackets!
Daniel