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Sep 17, 2010, 06:50 AM
Delusional Wanna-Be
John Rood's Avatar
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Build Log

MiG-15 in 1/10th scale for PSS: A Scratch-Build

This is a re-cap on a MiG-15 slope-soaring glider, a 1/10th scale home-design & scratch-build that I began with a lot of fanfare in 2006 but never finished. I got lost in unnecessary complexities when what was needed was to keep things simple; eventually I set the whole thing aside.

Modifications to "scale" outlines: Slight area increase for wings and horizontal stab, stretching the span and chord, and a very slight decrease in LE sweep. Very slight stretch to the fuselage to maintain some "it looks near-scale" proportionality with the enlarged wing & stab. An art, not a science? Yes!

Airfoil: MH-32 <~~~efficient for slope-soaring model gliders

In the above sketch, purple shows proposed modifications to scale outline for the wings and tail.

Controls: Ailerons and elevator; no landing gear.

Construction: Foam wings and tail with spruce and balsa stiffeners, fiberglass fuselage from a carved foam plug.

Above: Laying fiberglass on the fuselage plug.

Wings plug-in for easier transpo.
Last edited by John Rood; Oct 31, 2013 at 04:39 PM.
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Sep 17, 2010, 07:21 AM
Delusional Wanna-Be
John Rood's Avatar
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Where We Left Off

To recap: I tried making a fiberglass fuselage via the "lost foam" approach (shaping a foam "core", glassing it, and then dissolving the foam core). Well, my glassing job turned out wayyy too HEAVY (I put too much of the stuff on) ... so... I decided not to dissolve the foam... and see what I could salvage.

So I sliced the fuselage in half, and I was able to reclaim the fragile pink foam core without wrecking it, so I now can try the lost-foam technique again, and hopefully do a better job glassing it this time.

But meanwhile, readers here challenged me to instead finesse the heavy fiberglass shells into a PLUG, so I could then make a female mold around it and then lay up fiberglass fuselage shells inside the mold.

If I go that route I'll add a vertical fin, canopy and tailcone to the plug. And of those, really I should've added at least the vertical fin from the get-go.

So what you see here is as far as I got with the fuselage.

The wing became its own fiasco by me deciding I was running out of time before the PSS Festival so I'd just convert a ready-made EPP foam wing (RG-14 airfoil section from Jack Cooper) into shape for the MiG.

I had begun the horizontal stab & elevator: my plan was for a foam core with 1/64 ply sheeting, then add a hard balsa LE and TE for the stab and an all-balsa elevator.

Last edited by John Rood; Jul 13, 2019 at 09:09 AM.
Sep 17, 2010, 08:56 AM
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JosePain's Avatar
Niceeeee ...! i love PSS stuff ...
Sep 17, 2010, 12:46 PM
Delusional Wanna-Be
John Rood's Avatar
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Jose, I just saw all your PSS builds on your blog here! Excelente! And who'd a thunk you could fly slope down in Florida! Very cool planes, man.
Sep 17, 2010, 08:41 PM
Registered User
JosePain's Avatar
Thank you John , i'm very lucky to have a local slope which is actually a landfill and we can fly always upwind . Your project looks great too ..!


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