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  #11  
Old 11-13-2021, 09:47 AM
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Wow, has it been that long?
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  #12  
Old 11-13-2021, 09:59 AM
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Quote:
Originally Posted by Don Boose View Post
It looks like a Corsair.

Is there anyone left on the Forum who remembers the story behind that punchline? Rick? Tim? Ron? Dan? Chris? Bueller? Mustang Canopy question No Thunderbolts were injured in the making of that thread.

I don't plan on trying to become an expert on these engines...
I'm already confused by the number of variants and applications. LOL
But the Corsair used a much earlier version of the R2800 with water injection.

The (P47) -21 version is a lot later, the first with the Supercharger added
and the elaborate air cooling system built into the Jug fuselage.
No water injection any more because Jugs don't ditch!? hahaha Navy vs Army

There seems to be a lot of visible differences over the different models
and applications, so I am trying to focus on the Thunderbolt.
But I am not going to be too picky, since I have to stylize some things for paper model design.

And I don't know about the Corsair joke.

How about this one?
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  #13  
Old 11-13-2021, 10:15 AM
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Yes. And the problem was that, not only did the P-51 have a vulnerable radiator that the Thunderbolt did not have, but (unlike, say, the P-40) that radiator was in an exposed mid-fuselage position.

Dan Jackson, author of Fallen Tigers: The Fate of America's Missing Airmen in China during World War II notes that the P-51 had the highest loss rate of any Allied aircraft in the China-Burma-India theater for exactly that reason. He explains in a recent Army Heritage Foundation webinar based on his book: Fallen Tigers: The Fate of America's Missing Airmen in China during World War II with Dan Jackson - YouTube (the discussion of relative aircraft losses begins at around 18:10.
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  #14  
Old 11-13-2021, 12:10 PM
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Sports cars are always the worst to drive and most unreliable cars!
LOL
The more you pay for it, the longer it will spend in the Shop!
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  #15  
Old 11-13-2021, 12:43 PM
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What is the scale of this new T-bolt, Dave?
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Old 11-13-2021, 01:13 PM
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I wanted to do something large...with a bit more detail.
I also wanted something that could be motorized...maybe have a spinning propellor?
What I have been working on is roughly 1/6 scale, but that was a fluke.
I started with a small electric motor, measured its width, etc and built that center former box big enough to accommodate it.
Then I just worked outwards from there and when I measured it all, it was already close to 1/6 scale.
So I made the necessary adjustments to get it as close as possible to 1/6.

As I mentioned at the start, this is an old project idea that I never got rolling with...
until now...after I saw a motorized engine model online.

This engine interested me because the single row (9 cyl) WASP engine powers the little GeeBee racer,
but more importantly, the double row WASP engine (18 cyl) is the engine in the P47 Thunderbolt Fighter.
And of course, I have a few Jug kits in my store.

Did you know there is a four row WASP?!! Thats 36 cylinders! The WASP Major.
Check it out: Pratt & Whitney R-4360-35 Wasp Major, 4-Row, Radial 28 Engine | National Air and Space Museum

One of the problems I have run into is the number of WASP engine variants and different Cylinder designs.
*Different years and different applications...like Corsair I guess?! lol
I am attempting to focus on the R2800-21, a later version specifically for the P47 I believe.

Because of the scale, I can't over-simplify as much as I would like to!
For the longest time I was working on a Cylinder assembly, which tunred out to be a lot more challenging than I had thought.
Rendering it as a buildable paper model isn't going to be easy!
I finally completed a design before starting on the Crankcase...
only to find out its not the same as the intended v.21(P47) version!

Regrettably I will have to chuck out all the cylinder work and restart from scratch now.



As I said, this is to be a P47 engine...I had planned to build it on some sort of engine stand,
or maybe even a stand similar to the Thunderbolt frame.

Maybe something like whats in the photo below.

The internet offers me a lot of reference photos of WASP engines, but a little too much to be honest,
and its confusing to pick through the hundreds of variants.
I'd love to focus on one engine (like the one in the photo) but there just aren't enough photos of this particular one.
If anyone is visiting a Museum that has a P47 R2800 on display, I'd love a few hundred photos of it?!
The one pictured is in the USAF Museum Dayton.

It would also be nice to get some actual measurements since I have been guessing on a few things!

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Last edited by airdave; 11-13-2021 at 01:28 PM.
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  #17  
Old 11-13-2021, 01:36 PM
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This will be a terrific model!

Fascinating story so far.

Don
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  #18  
Old 11-13-2021, 02:14 PM
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Dave,

Have you taken a look at the archives of the Smithsonian?
I did a search on Wasp engine, and got a number of returns, but a query on R2800 yielded nothing, I might not have used the right terms, but Air & Space does have copies of the R2800 on display, not sure if it the DC or Udvar-Hazy location.

Maybe ask Anne for a contact regarding the engine?

Rick
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  #19  
Old 11-13-2021, 02:23 PM
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As I said, I'm not short of nice photos of R2800s on display
...but its those close up and odd angle photos I need.
As well as some actual hands on measurements.

The kind of stuff I need a model builder to shoot. lol

Maybe someone is planning a visit to one of the US museums that has an R2800.
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  #20  
Old 11-13-2021, 02:34 PM
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How about getting this book? It’ll give you propably all the info you need. On sale (-10%) here. Very interesting project Dave!

BR Tappi
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