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Build-Along-a-Chippy

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Martin McIntosh30/11/2020 09:28:20
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3697 forum posts
1287 photos

Actually just beat you to it yesterday.

With some keyhole surgery and debonder I managed to lever up the sheeting on the rear fairings, add the missing tapers and glue it back together a bit more like it should have been in the first place. I then used my root rib template to check the alignment of the flaps and while I was at it made a tip template to get the ailerons in the right place. Got to glue the hinges to the wing at some point so I did this while everything was clamped and pinned in place. Despite being careful to check the `up` travel during construction I doubt if there is sufficient but can shave a little from the top of the LE. One side only done to this stage so far.

I am wishing that I had made the rear fairings concave because they look strange to me.

Good luck with the P51 and hope that you have enough balsa.

Danny Fenton01/12/2020 11:21:10
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9833 forum posts
4572 photos

Hi Martin, as i say there was some discussion about the shape of that fairing, and in the first picture I did it as a Spitfire fairing, it was wrong. the picture of the full size, with the graduated paper tape shows that the trailing edge of the fairing bulges outwards, concave?

It is really difficult because of the curve, you only have to alter your angle of view and it goes from concave to convex.

I re-did mine once I saw that photo. Hope I haven't confused you too much?

wing fairing.jpg

Cheers

Danny

Martin McIntosh01/12/2020 12:29:58
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3697 forum posts
1287 photos

Thanks again Danny. No turning back with mine now, even a little filler is on. Will send a pic. later.

I had to Dremel some scallops from the aileron/flap hinges because the aileron link was hitting them, thus restricting the `up` movement. Still plenty of meat left though.

Started to cover the wing control surfaces as a little light relief from banging my head on a brick wall.

Martin McIntosh01/12/2020 20:51:37
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3697 forum posts
1287 photos

Bit more confused now with that photo but anyway here is mine:

chipmunk 022.jpg

The extra bit is a start on getting it closer to the flap.

chipmunk 023.jpg

chipmunk 025.jpg

chipmunk 026.jpg

Some of the rest, right or wrong.

Martin McIntosh03/12/2020 16:38:00
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3697 forum posts
1287 photos

Got the tail wheel and rud/ele links etc spot glued in and it all seems to work OK. The 3 and 2mm rods will be fixed to 5x3 and 4x2mm carbon tubes respectively. I see what you mean about the chicken/egg, horse/cart bit here. I faced the two rearmost formers with 1/64th ply which allowed me to cut them out a fair bit.

Pics as promised.

chipmunk 027.jpg

chipmunk 028.jpg

chipmunk 029.jpg

Colin Leighfield03/12/2020 19:29:52
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6086 forum posts
2557 photos

That looks good Martin.

Martin McIntosh05/12/2020 16:09:59
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3697 forum posts
1287 photos

Can anyone please enlighten me as to what the arrowed parts in the pic below are supposed to be?

chipmunk 030.jpg

NigelS05/12/2020 16:19:24
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47 forum posts
166 photos

I'd say those are the outine of the tail aerofoil passing through the fairing(s). you're looking down on top view over a convex turtle deck.

N.

Martin McIntosh05/12/2020 19:46:39
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3697 forum posts
1287 photos

Could be. I shall have to dig out pics of what others have done there. I shall not be too fussy now as long as everything seems to blend in.

Danny Fenton05/12/2020 22:22:56
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9833 forum posts
4572 photos

That's how the block is shaped to allow for the tail plane leading edge, as Nigel says, its only an illustration really to help understand what's going on, you cannot use it to cut anything.

Cheers

Danny

Martin McIntosh06/12/2020 10:50:22
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3697 forum posts
1287 photos

Thanks, I think I understand it now. There is a lot of confusing `looking down through a convex shape` on the plan.

Currently working out how to eventually get the rudder fitted and aligned with the torque rod while everything is coated in epoxy, so have embedded a brass tube in the base leaving just the hinges to glue in. In my case the rod is not fixed vertically otherwise, and is critical to clear the elevator rod and tail wheel springs.

Martin McIntosh08/12/2020 20:03:32
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3697 forum posts
1287 photos

Getting somewhere now. With a lot of work over the last couple of days I have the rear end done as near as I can get it. Just applying the second coat of filler. Those little strips on the side of the fus. in front of the tail appear on full size pics but not on the models I have seen so far so I have fitted them.

Since the canopy is in green I shall do the camouflage colours to match it, not my first choice but at least I already have most of the paint. Itching to get on with the glassing and the cowl but not quite there yet.

chipmunk 031.jpg

chipmunk 032.jpg

Danny Fenton08/12/2020 21:19:41
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9833 forum posts
4572 photos

Martin looks really good. Be careful here, the plan is for a DHC1 there are very few of those flying. Most are T10 or later 22. In fact i only know of one DHC1 still around, G-AKDN.

The early version has dual elevator trim tabs a narrow rudder and no anti spin strakes in front of the tailplane. The roof of the canopy is different too.

However only anoraks like me would know

Cheers

Danny

Colin Leighfield08/12/2020 21:29:25
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6086 forum posts
2557 photos

It’s worth bearing in mind that the strakes and wider rudder were fitted to cure early problems with poor or no spin recovery. I’d be inclined to make sure the model reflects those improvements! !

Danny Fenton08/12/2020 22:08:18
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9833 forum posts
4572 photos

Colin is correct the wider chord rudder and strakes were brought about to deal with perceived issues with spin recovery.

I have a couple of docs that I am happy to share with peeps, but as they are both PDFS this forum cannot help us here. So if you want to read them drop me a message.

here is the cover page from the Australian document::

spinning cover page.jpg

Cheers

Danny

Colin Leighfield09/12/2020 09:58:05
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6086 forum posts
2557 photos

Throughout its long career, there has been debate about Chipmunk spin recovery, despite modifications and the Canadian built planes having a re-designed elevator. In one case the pilot in desperation at the plane’s refusal to come out of the spin opened the canopy (to jump out?) and it immediately recovered! There could be aerodynamic reasons for that, it’s a lot of surface area moving backwards. Here’s one of the original Canadian development planes after a problem trying to recover from a spin, the crash that started the whole thing off. 2a951d4d-556b-49a7-abf1-c9b6b9d2322b.jpeg

Martin McIntosh09/12/2020 10:24:57
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3697 forum posts
1287 photos

Thanks again for the replies and comments, I shall bear that document in mind. I have not as yet decided on a particular subject aeroplane but it will now have to be one in a camouflage scheme. A little cheating with some details is OK to me.

Still cannot find a suitable pilot but I shall keep searching.

Martin McIntosh12/12/2020 20:31:04
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3697 forum posts
1287 photos

Hi again,

Looking for a colour scheme something like WP964. I can only get a couple or so shots so need much more detail such as the underside and wing camouflage. Any ideas please?

Danny Fenton13/12/2020 11:43:27
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9833 forum posts
4572 photos

WP964 has been a few colours Martin:

All I can suggest is google, it hasn't been in a camo scheme since the late 80's from what I can see.

Cheers

Danny

Danny Fenton13/12/2020 11:49:46
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9833 forum posts
4572 photos

this one shows a little of the underside?

de havilland canada_dhc-1-t10_vh-rtw_yrwf_13.jpg

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