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1/18 Curtiss P40C


airscale

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28 minutes ago, KUROK said:

Hi,

 

The cockpit floor in P-40s was the top of the wing.  So it should not be flat.

I see a piece of styrene in there now, maybe that's temporary?


Hi KUROK,

 

Look again. The floor plate conforms to the airfoil profiles of the wing roots. It ain’t flat.

 

Cheers,

Adam

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evening all :)

 

On 1/7/2022 at 6:52 PM, adameliclem said:

Hi Peter,

 

Happy to help. The  Z-proxy looks promising. If you test it to see how it interacts with the foam, I suggest you also test it on the plastic you used for the formers, or laminate a bit of scrap foam and plastic to see how they behave together. I don’t think there’s much chance of another Great Banana Fuselage Crisis, but I remember it well.

 

As always, you’re doing terrific work.

 

Cheers,

Adam

 

Haha, thanks Adam - I remember that too - chemical heat reaction of two part foam inflating my tigercat :) won't do that again

 

 

On 1/7/2022 at 7:32 PM, patricksparks said:

Awesome progress !!! looks like the foam worked well so far. It looks like your foam is a lighter density than I've been using, the foam that you are using is much easier to sand though than the 20lb stuff, it requres some serious elbow grease, I use a small drum sander on my fordom flexible grinder and rasps to knock down large areas and get shapes close and then finess with 60-80 grit sanding blocks and files then go down to the finishing grits. The 20lb density is much more solid and stable for making patterns that can be vac-formed over, just an fyi if you want to use foam for forming it's definately a good alternative to hardwood and acrylic patterns, I have pulled pretty heavy thickness(.080-.125) shots over the heavy foam. I have also made some canopies over it, I made the pattern slightly under sized and pulled petg over it, left that shot on the pattern and pulled another petg shot over it with the polyethelene film left on the side that goes down onto the pattern.

Always a great treat to watch your projects, thank you !!!

Pat

 

 

Thanks Pat - always good to have an experienced wingman :) I might try the heavier stuff next time as this foam is while stiff, quite lightweight

 

 

On 1/8/2022 at 4:07 PM, KUROK said:

Hi,

 

The cockpit floor in P-40s was the top of the wing.  So it should not be flat.

I see a piece of styrene in there now, maybe that's temporary?

 

 

That's a good spot KUROK and please do keep me staight on this build as I don't know the aircraft well at all. I did profile the floor to the aerofoil so thats fine, and I had marked out the dihedral & started to make a base floor with it but them remembered all the floor parts and the central rib are all being made up in PE..

 

VCzPxI.jpg

 

..there are about 15 parts to the floor & rib and because it is not in two halves or shaped to be both curved back to front, and also accept the dihedral, I will just keep the aerofoil shape and leave the dihedral - it will be imperceptible in the end hopefully..

 

so, onto the fuselage - I did some experiments with Z-Poxy resin both with and without tights..

 

vL1P5Z.jpg

 

..the findings were mixed - just adding a layer to the foam gave a bit of a skin (on the right), but I could still easily deform it with a fingernail... with the tights, the surface was way stronger but very textured so would need a lot of work, or perhaps more coats..

 

In the end, I decided to stick with plan A and skim the foam and fuselage with P38 filler..the skin is very thin and ultimately still quite fragile, but with a mix of CA and filler it's good enough to form and rivet litho over..

 

DWvkAC.jpg

 

..it took a bit of work, and where I sanded through the filler to the foam,  I just washed it in thin CA and skimmed over it again..

 

Rg6OuC.jpg

 

3h6dMG.jpg

 

..then I added a cotton datum and chopped out big holes to add boxes for the exhaust areas - these wil ultimately be 3D printed so all I need is the 'hollow' that goes behind the skin panel..

 

oh1qjF.jpg

 

..then the fuselage was refined, the lower cowl vacformed (& here only taped on) and the body shot in high build automotive primer..

 

..the lower nose under the spinner has been left as it's a complex scalloped shape

 

PZRyNk.jpg

 

VeV5ii.jpg

 

o7UBfT.jpg

 

SCFW1p.jpg

 

GmQp6H.jpg

 

..still lots to do, but the base form is starting to take shape..

 

TTFN

Peter

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thanks chaps :)

 

It is like Christmas morning here in the airscale house..

 

my giant PE sets turned up, perfect as always from PPD

 

8bhJiW.jpg

 

a walk around..

 

left to right - gun sides, cockpit floor, below that main gear door inners

 

YmANb1.jpg

 

 

lower canopy, canopy retraction mechanism & wheel, rear cooler meshes, below all that main gear roof parts..

 

 

1WcOLI.jpg

 

cockpit parts, rudder pedals, cowl flaps, fuselage cockpit bulkhead formers

 

ljRWNY.jpg

 

instrument panel, throttle quadrant, tailwheel door inner

 

CxTuie.jpg

 

flap ribs..

 

Ez6G9s.jpg

 

cockpit parts, belly tank / bomb shackle, fuselage hatch

 

aCG27I.jpg

 

 

..rudder mass balances, wheel parts, bulkhead 5 backing plate

 

mIsG9d.jpg

 

fin spar, rear canopy skins, bulkhead 5 face plate and in the middle of that cockpit parts

 

758CGy.jpg

 

..chin radiator / cooler meshes

 

vRjATK.jpg

 

seat parts..

 

WJyfXl.jpg

 

 

..very happy with how they turned out, just need to remember what they all are now :)

 

TTFN
Peter

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On 1/9/2022 at 1:39 PM, airscale said:

That's a good spot KUROK and please do keep me staight on this build as I don't know the aircraft well at all. I did profile the floor to the aerofoil so thats fine, and I had marked out the dihedral & started to make a base floor with it but them remembered all the floor parts and the central rib are all being made up in PE..

 

VCzPxI.jpg

 

..there are about 15 parts to the floor & rib and because it is not in two halves or shaped to be both curved back to front, and also accept the dihedral, I will just keep the aerofoil shape and leave the dihedral - it will be imperceptible in the end hopefully..

 

Fantastic progress, Peter!

 

For future reference, here are some pics of the floor area (from a P40K), note the panel lines continuing across the span of the wing. 

20220112_085343

 

20220112_085038

 

 

Hope that helps!

 

Denzil.

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