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 Post subject: North American BT-9
PostPosted: Thu Feb 11, 2010 3:28 am 
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Paper Model Overlord
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Joined: Fri Oct 06, 2006 1:15 pm
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Location: Alameda CA
Here is a truly new model, one that has never existed in paper so far as I know. A customer called up wanting one for her 92 year old father, who flew them in the late 30s. I said, no problem, I'll just make a few tweaks to the FG T-6 & voila - a BT-9.

Ho ho.

While the T-6 is a much improved later derivative of the BT-9, they really aren't the same aircraft except in superficial outline, and to heap complication atop complication, the FG T-6 is not, pardon my honesty, a model with either good fit or proper proportions. So the "quick tweaks" turned into a major overhaul of the entire model. Well, at least now we've got a new addition for the FG stable (once Chip gives it the OK).

So what differentiates a BT-9 from a T-6? Lots. The engine, for one thing, is considerably smaller on the BT-9, a 475 HP Wright instead of that massive 600HP Pratt Whitney. The landing gear is fixed, with a nice set of fairings and spats. The wingtips are round, not square. The rudder is round, not tapered. The fuselage is fabric covered, not monocoque.

Making all those changes to the T-6 was work enough, but other fixes were needed: the wing/fuselage juncture is a disaster (as seen in this first of several trial builds) ---

Image

The windscreen and canopy were way too large and had to be shrunk, then reshaped. And I can't abide the design technique of making the vertical fin integral with the fuselage; there's just no way to properly achieve all the myriad curvatures back there doing that. The first thing I did was completely redesign the empennage, built with cambered surfaces and wrapped leading edges, so it'd look much closer to what a real airplane looks like ---

Image


Fixing that wing/fuselage juncture was a real bear, but descriptive geometry saves the day in this business, and I made a juncture and fairing that not only looks like the real airplane, but is EASY to assemble as well (now THAT'S an achievement). Here's the real airplane ---

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And here's my juncture and fairing ---

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I thought the landing gear might be difficult, but it turned out to be ridiculously easy, just a folded over fairing and the wheel glued to the inside surface. Simple, yet strong. The landing light in the photo, incidentally, is a photograph of a Beech Bonanza's landing light photoshopped into the leading edge. Note also that the leading edge of the wing is round, not creased, and NO fold line - that 304 insignia wouldn't look good across a folded leading edge ---

Image


Somehow I got it all done and looking halfway decent; here're the rest of the pictures:

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It took three trial builds to get there, (and innumerable reworks in photshop), but definitely a worthwhile adventure

Image


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 Post subject:
PostPosted: Thu Feb 11, 2010 7:33 am 
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Paper Model CINC
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Location: West Virgina,USA
WOW :shock: Beautful build 8) Looks absolutley great airportkid :wink: I would really love to learn how to design :) But, I fear I'm to old and impatient :( Like to build um tho :D

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Just finished:FG's Large Hawker Typhoon

http://satellitedoctor.mysite.com/
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We havin fun yet?[b][/b]


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 Post subject:
PostPosted: Thu Feb 11, 2010 7:55 am 
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Botbuster Master
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Location: HARTSHORNE, OKLA.
great....i love the close up shots.....those are always helpful to me when building a model......keep em comin......

p.s....that is an FG , right? :D :D :D

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Possm_23
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Take your time leavin.....but hurry back!!!!
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 Post subject:
PostPosted: Thu Feb 11, 2010 9:01 am 
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Supreme Paper Commander
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Joined: Mon Sep 25, 2006 10:42 am
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Location: Papillion, NE
That looks great Mark! I hope that Chip gets it into the line-up quickly


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 Post subject:
PostPosted: Thu Feb 11, 2010 11:31 am 
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Supreme Paper Commander
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Location: Winnipeg, Manitoba, Canada
Super! Love those colours.

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 Post subject:
PostPosted: Thu Feb 11, 2010 1:47 pm 
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Paper Model Overlord
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Location: Alameda CA
possm_23 wrote:
... that is an FG, right?

Substantially so, even after all the rework. The basic architecture of Chip's amazing one piece fuselage is intact, albeit I swapped the seam to the underside instead of the top. The wings are stock except for the new rounded wingtips, a 2 degree correction in the trailing edge sweep, and the addition of internal stiffeners in the center section to keep the airfoil from concaving where it joins the fuselage. You can see I left most of the Brooklyn Bridge sized rivets and panel lines intact as well (it was getting to be too much work and I needed to get this thing done and out the door to my customer).

Many thanks for all the kind comments!

I'll be looking forward to Bob's clear taped canopy version of this after I get it into Chip's inventory 8)


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 Post subject:
PostPosted: Thu Feb 11, 2010 3:08 pm 
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Paper Model CINC
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Location: West Virgina,USA
COOL :!: :!: 8) LOOKIN FORWARD TO IT :wink:

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On Silent Wings I Fly.

Just finished:FG's Large Hawker Typhoon

http://satellitedoctor.mysite.com/
http://flybirdman.4t.com/
Spoke wheel Tutorial
http://flybirdman.4t.com/box_widget.html

We havin fun yet?[b][/b]


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 Post subject:
PostPosted: Fri Feb 12, 2010 7:36 am 
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Paper Model CINC
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Joined: Thu Mar 20, 2008 2:04 pm
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Location: Waterlooville, Hampshire, England
Outstanding work Mark :D. I'm with Bob - I'd love to know how to design, but fear that it's beyond me at the moment :roll:.

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 Post subject: Re: North American BT-9
PostPosted: Fri Feb 12, 2010 9:59 am 
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FG Origami Master
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Joined: Tue Oct 27, 2009 2:05 pm
Posts: 207
Location: U.S.A.
Hi Mark,
WOW 8)
Hope this one is available sometime.
A really nice looking aircraft and a wonderful job.
Great pictures too.


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 Post subject:
PostPosted: Wed Feb 17, 2010 11:36 am 
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FG Origami Master
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Joined: Wed Jun 25, 2008 2:24 pm
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Location: Hopewell Junction, NY
Beautiful redesign and repaint! I've built FGs Texan so I have some feel for what you went thru to achieve the wonderful results that you did. Exceptional workmanship thruout.

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Don

Currently working on: 1/48 Fokker DVII
Recently completed: 1/72 Douglas Skystreak


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