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P-39 Airacobra Brotherhood

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Old 11-18-2018, 03:18 AM
  #201  
LDM
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Picked this up from a ( friend lol ) mice droppings in the wings , warped fuse, mold, missing center wing ribs, hole in cowl for a glow engine.
I rebuilt the tail from Gold Edition plans, added retracts , flaps , all scratch built interior.
I had to compromise of many scale elements -examples
front gear rake is not forward because I could get the proper clearance for the prop I wanted if I angled the gear. Also angeling the gear increasing the wheel was not an option.
Scale cockpit was scratched for a baby seat elevated view lol but no choice because I worked on my CG during the build phase and I would need to locate my 6 cells under the cockpit .
I have not maiden my P39 yet and my growing concern is reading many thread on the dreaded “flat spin” of this design !!!!
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Old 11-26-2018, 12:27 AM
  #202  
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Old 11-26-2018, 12:34 AM
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Old 11-26-2018, 11:57 AM
  #204  
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That is a very nice P-39!!! Please post some details about it.
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Old 11-26-2018, 11:09 PM
  #205  
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I will , I am still putting together all the info . started working on it to be ready for maiden.
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Old 12-30-2018, 09:53 PM
  #206  
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My current builds . . . 1/8th scale composite P-39s designed for Scale Warbird Racing:




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Old 12-30-2018, 10:00 PM
  #207  
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A second lay-up in the molds; along with a cowl for a 1/10th scale P-47 and cowl molds being made for a RareBear and Czechmate.



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Old 12-30-2018, 10:11 PM
  #208  
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CAD designed, laser-cut wing:



Shear webs laid out




Initial framing of both panels




Close-up of carbon fiber rods and spruce spars




Although this wing was designed for retracts, I am modifying these for fixed gear, because my current fuse plug is designed only for fixed gear. (And, that is one less thing to go wrong when reliability is the key for a successful racing season.).
But to make it up to the scale aficionados, I am trying scale split flaps for the first time. (Fingers crossed)
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Old 12-30-2018, 10:18 PM
  #209  
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Testing the fit of the first wing-half to the fuse, now that it is far enough along to remove from the wing-jig.


First panel roughed-out. Bottom view. Flap and aileron servo hatches are visible -- as is the unfinished split flap assembly.
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Old 12-30-2018, 10:26 PM
  #210  
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Starting second panel





Trimming the excess sheeting to form the flap on the second panel




Wood blocks for installation of Robert hinge-points


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Old 12-30-2018, 10:36 PM
  #211  
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Hinge-points installed. Now for the moment of truth . . .




Relief . . . They work!




First wing-halves have been joined and wing sitting on the fuse





Close-up of wing tip being shaped
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Old 12-30-2018, 10:46 PM
  #212  
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Two new scale wings after fiberglassing the center section (right and middle). On the left, is a wing "Frankensteined"/cannibalized from two older hand-cut prototype wings that were previously crashed. On one wing, the right panel survived; and, on the other wing, the left panel survived. My original prototype wings were not scale. They were stretched-out four inches from true scale, and had full-span ailerons.

Last edited by Iron Dog; 12-30-2018 at 10:48 PM.
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Old 12-31-2018, 07:30 AM
  #213  
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Awesome work!!! What is the wing span?
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Old 12-31-2018, 08:23 PM
  #214  
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I appreciate that -- thank you!

The wingspan of my laser-cut wing is 52 1/2"
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Old 10-06-2019, 03:43 PM
  #215  
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White and yellow KlassKote paint sprayed and masked off. Just applied grey.
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Old 10-06-2019, 03:47 PM
  #216  
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Painting with KlassKote Olive Drab and application of home-made decals complete, then clearcoated. Final assembly stages of "Mischievous Miss."
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Old 10-06-2019, 03:49 PM
  #217  
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Gluing canopy on "Sneak Attack."
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Old 10-06-2019, 03:56 PM
  #218  
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At S.A.M. site, day of maiden flight.

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Old 10-06-2019, 04:02 PM
  #219  
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"Surprise Attack" being finished-up. Older, worn spinner being utilized for maiden flight (in case the worse happens). Two other P-39s visible on rack in background.

Last edited by Iron Dog; 10-06-2019 at 04:15 PM.
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