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All Composite 1/7th P-40E Mould Build

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Old 02-16-2012, 06:56 AM
  #401
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Default RE: All Composite 1/7th P-40E Mould Build

Now that's fuel proofing.

Cool!

Steve
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Old 02-16-2012, 02:36 PM
  #402
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Default RE: All Composite 1/7th P-40E Mould Build

OK, so it's 3/4 Oz cloth in all the tight spots. This is followed by a layer of 9 OZ cloth all around and overlapped in some critical areas like around the firewall and wing saddle etc.. Then it's all wrapped up with a final layer of surface veil. You like??
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Old 02-16-2012, 10:08 PM
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Default RE: All Composite 1/7th P-40E Mould Build

18 hrs so far...but here's two pieces in the bank
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Old 02-17-2012, 08:21 AM
  #404
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Default RE: All Composite 1/7th P-40E Mould Build

For my next trick, and with a little bit of luck, I will demonstrate a bit of the assembly plan that I designed into this mould more than 5 years ago now....patience my friends, patience...


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Old 02-18-2012, 06:00 AM
  #405
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Default RE: All Composite 1/7th P-40E Mould Build

The chin plate is 2 layers of 6 Oz and 2 layers of 9 Oz. This is what connects the firewall to the wing saddle.
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Old 02-18-2012, 10:21 AM
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Default RE: All Composite 1/7th P-40E Mould Build

thank god ,i was starting to wonder if i was ever going to get my slow-n-low fix talk about a long withdrawl 8} glad to see you back brother .im still on the final stages of sanding before i start the primer and scale work but ttyl,brian
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Old 02-21-2012, 11:26 AM
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Default RE: All Composite 1/7th P-40E Mould Build

Slow

Why would one not airbrush the colors into the mold? Save time, material, and save weight.

This would give a feathered/soft edge at the color borders as in full scale. Of course the paint can easily be made fuel proof in the fabrication process as well.

Quality airbrushes and techniques can do amazing things.

??

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Old 02-21-2012, 12:50 PM
  #408
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Default RE: All Composite 1/7th P-40E Mould Build

I have airbrushes large and small Steve, and you can bet that mine will get full treatment, but this costs a whole penny per plane, so Ican't help but answer the question....
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Old 02-21-2012, 06:18 PM
  #409
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Default RE: All Composite 1/7th P-40E Mould Build

Changed the lamination a little - 3/4 Oz all over, 2 Oz all over, 6 Oz Chin PlateAlso layed in some scrap 1/8" ply to attach cowl mounting blocks to later....next to join main halves and then assemble with firewall subassembly
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Old 02-22-2012, 01:40 PM
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Default RE: All Composite 1/7th P-40E Mould Build

Trimmed the perimeter with a blade at around 10hrs into room temp cure.Prepped for joining with 80 grit paper.Notice that I'm also going to insert the 1/8" ply dowel bulkhead now as well. I cut away the opening by removing the lower wing saddle sections of the mould and getting in there with a dremmel and a cutoff wheel rather than messing with the knife.
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Old 02-23-2012, 01:41 PM
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Default RE: All Composite 1/7th P-40E Mould Build

Main Fuselage Joining1" wide 6 Oz X2 layers(gotta get some tape...)
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Old 02-23-2012, 10:37 PM
  #412
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Default RE: All Composite 1/7th P-40E Mould Build

I can't believe I forgot to take a picture, but you'll have to take my word for it that there's a 1/8th ply bulkhead in there too. It's sandwiched between 3/4 Oz and several layers of 6 Oz cloth.

I impregnated the epoxy with black tempra with the idea being easy contrast witht any contaminates that might get picked up by the wing locating face...and I hadn't used black yet either



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Old 02-24-2012, 07:31 PM
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Default RE: All Composite 1/7th P-40E Mould Build

now I'm havin' f-u-n heaven, I'm in heavenply insert is excessively strong...very nice for rigidity
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Old 02-25-2012, 12:11 PM
  #414
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Default RE: All Composite 1/7th P-40E Mould Build

All ready to join firewall subassembly to main fuselage assembly.Although this resin and hardener combination is taking up to 48hrs at 72 F to cure to a point where I would consider demoulding it, I'm in no rush, and it seems to be extremely stiff in the wing saddle cross section when it finally does harden right out to the surface.I am considering turning this cavity into an integral fuel tank....
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Old 02-26-2012, 12:07 AM
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Default RE: All Composite 1/7th P-40E Mould Build

3 layers 9 Oz Cloth - 1" wide stripsThis will eventually become the inside of the fuel tank.
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Old 02-27-2012, 07:32 PM
  #416
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Default RE: All Composite 1/7th P-40E Mould Build

Oh boy, so much to tell....This new cheap epoxy is great. It produces a stiffer, stronger part.Now don't let the ugly test fuselage scare you off, here's some things we learned...- surface veil for camouflage works great!- some black sharpie around the perimeter of dark brown camo patches adds a level of detail too- it is possible to match camo across parting lines- tempra powder works great and is inexpensive (10% by resin weight)- 1/4" ply is too heavy for firewall- 1/8" ply dowel bulkhead works great- assembly method for inserting chin plate / firewall subassembly works great! (I've been waiting to see if this would work for a very long time now)- pink P-40's are for girls next time green/blown blend will be substituted for the lighter brownI've also started on the firewall for the next one.It will now be 1/8" Ply laminated with aluminum skin.This aluminum looks to be around 0.020" maybe 0.5mm - it used to be a window awning...I've also calculated that I can squeeze in around 16 Oz of fuel in an integral tank behind the firewall and centered around the plug in the pictures.All in all, I'm already started on the next one...
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Old 02-28-2012, 05:10 AM
  #417
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Default RE: All Composite 1/7th P-40E Mould Build

hey slow low,
 great job i love the work you ve done. 1 question today, on your panel lines i am using a water based paint and primer i got from the local big box store. i've completed the primer and 1st sanding and getting ready to put first base coat on. my idea was to put about 4-6 layer buildup and then using a hot knife cut in the lines but ive noticed that some of your lines only have one raised edge on it. if i burn in ill have two.how did you get that single raised edge and do you think the two raised edges would be ok for scale?
thanks ,
brian(AT-6) midwest products 83" wingspan scrach-build
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Old 02-28-2012, 05:11 AM
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Default RE: All Composite 1/7th P-40E Mould Build

P.S. as soon as i can figure it out i'll take pics and send them to you
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Old 02-28-2012, 08:54 AM
  #419
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Default RE: All Composite 1/7th P-40E Mould Build

@rvaflyer - it took me longer to put those panel lines on than to build and finish the fuse - there's complete info in this thread regarding exactly how I did it (in fact there's even a video file)
Each panel was finished individually with resin and microballoons after the fuse was flat, straight, smooth, and ready for paint - it took years of sanding all day and night by hand - no joke.

What Ithink of your plane's panel lines doesn't matter at all - you're the guy who'll be standing beside it...

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Old 02-28-2012, 10:32 AM
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Default RE: All Composite 1/7th P-40E Mould Build

hey slow low,
 thanks for the input i've seen all you're vids(thats what inspired me to make moulds of this AT-6) being the perfectionist that i am this scrach build has taken me 8 months just to build the the fuse and wing.my biggest conserns are going to be w/ the canopy.i saw your vac moulding tech(about 5 months ago) and was wondering, ive heard that it can burn out the compresser have you run into that problm yet? plz keep up the good work i love following your thread and when im done ill finaly get to build  a p-40(at-6 kit was free)))
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Old 02-28-2012, 05:29 PM
  #421
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Default RE: All Composite 1/7th P-40E Mould Build

...not a lot of free time today, but here's a pic to motivate some of you to get away from the PC and wander back in the direction of your own workbenches.... how do like my computer skills!?
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Old 02-29-2012, 09:42 AM
  #422
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Default RE: All Composite 1/7th P-40E Mould Build

We need some internals and they need to be inexpensive, lightwight, and easy to install.I submit exhibit "A" - Aluminum with basswood if you please...11 grams worth
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Old 02-29-2012, 03:21 PM
  #423
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Default RE: All Composite 1/7th P-40E Mould Build

Firstly - we've exceeded our bandwidth allowance for the original photobucket account, so all picture links from here forward will point to a new account that can be found here... http://s1069.photobucket.com/albums/u475/Two_Bulldog/


This is the rear cockpit bulkhead. It provides a vertical mounting surface on the rear face for our rudder and elevator servo mounting brackets. It also provides a shear pocket in the forward face, into which the hardwood blocks that draw the fuselage to the wing saddle will seat.

Please remember that these are prototype parts and although they're not necessarily the prettiest, they are functional and more importantly have provided templates, and benchmarks for all future part revisions.

Making more is easy work...










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Old 03-04-2012, 06:27 AM
  #424
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Default RE: All Composite 1/7th P-40E Mould Build

If refinement is a fool's recipe for success, then I think on the right path...worn out old uniform pants - could I get any more ironic?? )Post Script - the missing pics will be back 031012
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Old 03-04-2012, 12:10 PM
  #425
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Default RE: All Composite 1/7th P-40E Mould Build

So our templates for cutting cloth are getting more and more refined, and in addition we now have a complete set including not only the brown areas but also the green. This will allow me to accurately pre-cut and lay down the continuous strand surface veil everywhere as an initial layer. This is what keeps the epoxy concentration and therefore opacity high at the part surface.

Alright, you may have noticed that I keep chopping things up into smaller and smaller operations. This is because I'm only one person. I will focus on producing one section at a time and joining them post-cure. There's been no issues with the strength of any seam thus far and this will allow me to take my time.

so first it's brown camouflage portside on cssv





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