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Old May 25, 2015, 07:58 PM
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Build Log
P39 Air Cobra Build

P39 Air Cobra build thread. Attached you will see pictures along with a step by step series on building this great Aircraft. If any of you have any ideas or suggestions they would all be appreciated.

Picture #1. Short Kit. Supplied by Dan with blueprints written by Brian Laird, gives you many options on your build

Picture # 2. The cores, make sure you mark them with a felt pen just in case they get mixed up

Picture #3. The balsa sheeting. You can purchase these anywhere, I purchased mine at Michaels and went through the whole barrel to get the lightest. You can use either a good wood glue or in my case Medium CA. Make sure you have a straight edge on all of the sheets that need to be joined. Next join 2 or 3 balsa sheets with Blue, yellow or any masking tape that you have. Now tape the seems. Once completed they will open like an accordion. Using wood glue or medium ca, glue a thin bead down each seam. Once completed lightly sand in a circular motion along the seam. The balsa dust will help join the sheeting.

Picture #4 Once the balsa is glued, joined and sanded it is time to cut a rough shape. Start with the bottom first. Lay the core down and trace around the balsa giving it about a 1/2 overlay. Now cut the piece of outlined balsa out. You now have the first piece of sheeting.

Picture #5 Now lay out the cores and sheeting and spray with 3M, again, bottoms first. Spray a medium coat on balsa and cores. Wait 10 minutes and spray again making sure the 3m can is clear of any solvent from spitting out (Could eat cores a little). Once done, join them. Once joined just rub along the balsa evenly with your hand going back and forth all over the sheeting. At this time you can trim off any excess balsa which makes sanding off the extra trim easier later. You are now done with the bottoms. Now to the same to the tops..

Picture #6. The Balsa skins are now glued and beginning to look like a wing.

Picture #7 Once the above is completed time to trim off some of the leading Edge. The plans call for 1/4 in Balsa or Basswood and the cores were already trimmed for that. Since I am using 3/4 Basswood as my leading edge I needed to cut an additional 1/4 off the Leading edge of the Cores. So go ahead and do that.

Picture #8 This picture show the Balsa and Cores trimmed and ready. You can see how large the 3/4 Basswood looks prior to plaining and sanding unless you have a neighbor like mine who took the basswood and plained it down to 1/2 by 3/4. The leading edge will be sanded with 60 grit to start to the shape of the airfoil.

Picture #9 Just had to do it
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Last edited by Rick T.; May 25, 2015 at 08:18 PM.
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Old May 25, 2015, 08:36 PM
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It's not going to build itself
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Go Rick Go!
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Old May 25, 2015, 09:29 PM
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Just Toss It !!!
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Looks like The Fest has fired up Rick.....Go Rick Go!
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Old May 25, 2015, 09:32 PM
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It's not going to build itself
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The Fest has a way of changing people. In a good way.
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Old May 25, 2015, 09:55 PM
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John 3:16
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Looks like it is going to be a great build thread Rick!!!


Dave
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Old May 25, 2015, 11:39 PM
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anybody out there hesitant to do one of these builds,dive in.
lots of help and example here.
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Old May 26, 2015, 12:41 AM
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Leading Edge

Thanks guys for the motivation and Support it helps Big Time. I am learning from more experienced builders then I will ever be, so thank you all.

Ok...Thanks to my great neighbor next door, he just saved me a couple of hours of sanding and more sanding cutting down the 3/4 by 3/4 Basswood Leading edge. As you can see in the pictures below I now have a lot less sanding to accomplish.

Also, if anyone is about to order from Balsa USA please let me know, I just need 2 Trailing Edge pieces 3/8 by 2 inches by 24 inches.

Rick
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Last edited by Rick T.; May 26, 2015 at 10:18 AM.
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Old May 26, 2015, 08:28 AM
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I don't build static models
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Nice Work Rick.

Just bite the bullet and order about 10 pcs. You will need them in the future...



Rubio
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Old May 26, 2015, 10:20 AM
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Matin, builders and fliers like yourself give me motivation, Thank You.

Rubio, I will order today or tomorrow from Balsa USA, and you are correct I will order about 10 pcs.
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Old May 26, 2015, 10:34 AM
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Today will be a light day, the following is my to do list/

1. Order 10 pcs of 2 inch trailing edge stock.
2. Sand the leading edge of the cores so the Basswood fits perfectly
3. Epoxy Basswood
4. I hate this part but it is part of building, Sanding the Leading Edge to the airfoil shape
5 Using templates, cut out Stablizer and Tail. Using P39 Tail, not P63 Tail.

That's all folks
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Old May 26, 2015, 10:39 AM
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balsa butcher extraordinaire
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sub'd.
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Old May 26, 2015, 10:42 AM
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Nice job Rick! I'll check around my shop I might have some aileron stock
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Old May 26, 2015, 11:52 AM
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Attaboy Rick---go go go!! This is a great project!!
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Old May 26, 2015, 12:16 PM
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Fun ain't cheap!
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Quote:
Originally Posted by 67econoline View Post
Nice Work Rick.

Just bite the bullet and order about 10 pcs. You will need them in the future...



Rubio

+ 2 on that! Also, if you get nuts about it, you can weigh them all, and match for weight so your wings come close to being lateral balanced when done. Some of the 2" and larger aileron stock can get really heavy. Usually not a problem unless you are going for a lighter weight ship.

Great build thread on one of the best PSS models of all time!

Andy
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Old May 26, 2015, 12:53 PM
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I don't build static models
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That's the first thing I do. Great advice Andy. I write the weight and pair them up. Use the lightest on ultralights and go from there.


Rubio
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