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Author Topic: VMC Blue Spitfire Build  (Read 1824 times)
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Crabby
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« Reply #25 on: June 22, 2017, 10:24:50 AM »

Looking good! Did you get a canopy in the kit or are you gonna be vac-forming?
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« Reply #26 on: June 22, 2017, 05:26:03 PM »

The kit has the standard canopy for an early Spitfire V with an external armoured screen, but since this is a PR version it has a curved windscreen (no armour) and a large side bulge on each side of the sliding canopy. I might be able to use the fixed rear part of the kit canopy, but will have to mould a new canopy and windscreen; might have to mould the rear part as well, actually. Will also have to mould the side bulges separately and stick them to the main canopy with clear dope. I haven't got a vac-form machine so It'll have to be plunge-moulded, and I haven't done that for, um... well, a very long time. I forsee many, many attempts and several spare canopies...

Pretty sure the new canopy will count as a "significant" deviation under kit scale rules, but I think I've racked up so many penalty points already that I've given up worrying about it.  Smiley
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abl
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« Reply #27 on: July 17, 2017, 09:03:24 AM »

I've had to get on with the non-standard spinner arrangement because I want to do a "bare structure" photo of the type usually seen in the better model magazines ("Aeromodeller", etc.) many years ago, so the spinner and prop have to fit.

Couldn't think of a reliable way of sanding the back plate to match the spinner, so tack glued it in place and did the sanding by eye.

Finding a way of assembling the rest of the components required a lot of considered and thorough consideration procrastination, in the end I thought that the most reliable way of producing something that was almost centered and had minimal wobble was probably to make a small jig (photo 2) from three 2" square bits of 1/16" sheet, 3/64" wire, and a few scrap bits of ply and masking tape to get it as centred as possible - this was done using a drill press to keep everything square; it should enable the prop and backplate to be assembled with minimal axial run-out.

The back plate is a push fit onto the jig, and the prop is just dropped on and fits in a 3mm hole on the backplate. Cut parts SP3 are subverted to hold the prop in the right position, although there's a small amount of play so it'll have to be glued in the jig. I think the best stuff to use for glueing is probably 5 minute epoxy and microballoons, used sparingly.

Also think I'm going to have to temporarily tape everything (spinner, prop, backplate) together and spin it on the shaft to find out where the prop should be glued on the back-plate to give minimal radial run-out.
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« Last Edit: July 17, 2017, 09:18:40 AM by abl » Logged
Jack Plane
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« Reply #28 on: July 18, 2017, 07:16:39 AM »

Excellent 'well-considered' job.  Grin

My own shenanigans with the spinner fell into the bodge-it-as-well-as-I-could category!
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abl
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« Reply #29 on: July 19, 2017, 04:02:40 AM »

Thanks for the kind words, but whether it works in practice is another matter entirely!  Smiley

I managed to get all the various bits and pieces to a reasonable state yesterday evening, so thought I might as well have a go at a trial assembly so that I could try for some "Aeromodeller" type structural photos; it's all assembled with a combination of masking tape, sellotape, double-sided sellotape, tiny dots of balsa cement and a little bit of blu-tack in the spinner. In this state, it weighs 22 1/4 grams...  Cry

It's going to require about 300 tons of nose weight and the only crumb of comfort I have at this stage is that it's slightly nose-heavy (by about 5mm).

I haven't got a proper dark background for photography so had to use what was to hand, the pictures were taken with an iPhone 6 and if I'd used the "proper" camera they might have been a bit better, but they're not too bad, I think.

Next job is to carefully take everything apart again and make a plug (or plugs) for the canopy.
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OZPAF
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« Reply #30 on: July 19, 2017, 04:54:46 AM »

I think it looks pretty good. Your efforts in jigging the prop / spinner seem to have paid off.
The holey centre spar web looks neat.
Andrew did a nice job on the design of this model.

John
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malc
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« Reply #31 on: July 19, 2017, 06:32:48 AM »

Thats looks really nicely finished, esp the nose infill and the shape of the exhausts, the weight seems reasonable. How are you going to do the upper wing fillets?

Malc.
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abl
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« Reply #32 on: July 19, 2017, 04:54:56 PM »

Thanks for the kind remarks.  Smiley

...

The holey centre spar web looks neat.
...


I enlarged them slightly with a Permagrit file.

Um... perhaps I shouldn't have admitted that because I suspect Kit Scale judges do occasionally look in to see what's going on, but I've racked up a fair number of penalty points already so a few more won't make much difference...  Smiley

...

Andrew did a nice job on the design of this model.


He did indeed.

Thats looks really nicely finished, esp the nose infill and the shape of the exhausts, the weight seems reasonable. How are you going to do the upper wing fillets?

Malc.

I worry about the weight because Jon's Pinko PR Spitfire had lighter components and still required a significant amount of nose weight; on the other hand, I suppose that my tissue is probably a bit lighter than the pink stuff that Jon used. I'm going to do the upper wing fillets exactly as it says on the plan - paper pattern, covered with tissue, curved to fit and stuck in place - looks as though it ought to work OK.

Andy
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