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P-47 Modelling: Finished!
This topic group is for completed photos of your models.
XP-47K. The Prototype Bubbletop.
lampie
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Posted: Sunday, January 24, 2010 - 12:38 PM UTC
The first P-47 to feature a "bubbletop" canopy was the XP-47K, which made its debut flight in July 1943.
The last razorback in the P-47D-5-RE batch of 300 aircraft, 42-8702, was selected for the conversion, the cost of which came to $64,464.
Alexander Kartvelli estimated a loss in top speed of 30 mph but these fears proved to be unfounded. More worryingly however, he predicted a serious loss of directional control and stability with the removal of the distinctive "razorback" spine.
During testing this went unrecognised and it wasn't until the bubbletops entered combat that the problem became evident and the dorsal fin was quickly introduced.
Later, another razorback from the D20 batch was converted to a bubbletop and this version, known as the XP-47L featured a greater fuel capacity.
The first production batch to feature the bubble canopy was the D25.
The XP-47K was flown for a time wearing its factory serial number.

The serial number on the tail was replaced by "P47K" and the red bordered national insignia moved into the more usual forward position at some point. Its this scheme that I'll be building.



I'll be using the Tamiya Bubbletop kit for the conversion which is very easy. The only difference externally to a production D25 is the earlier straight cowl flaps and I'll be using the Loon models resin ones.
A set of red bordered national insignia has been sourced as have some yellow numbers and letters decals.
The earlier "Toothpick" Curtiss prop will be fitted and the armament left off to match the photos. Paint job is the standard Olive Drab over Neutral Grey with no cowling or empennage ID bands.


If it all goes smoothly it should be a nice straight forward build, but I'm sure Sods Law will trip me up somewhere along the way as usual
Nige
jguignard
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Posted: Thursday, January 28, 2010 - 02:43 PM UTC
You could also do a second model of the XP-47K and carry it to the next step...



I am in the process of converting Academy's P-47N. Removed the rocket stubs, chopped off the dorsal fin, and will use a Tamiya cowl with the Loon D5 flaps. The donor Tamiya razorback kit will then get a Loon P-47C cowl. The quality of the photo is so poor that I cannot tell for sure, but it looks like there may even be a straight dorsal fin on the airplane, so I may use one from a Hasegawa kit.

Jim

lampie
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Posted: Thursday, January 28, 2010 - 11:03 PM UTC
Hi Jim.
Suddenly theres a rush on experimental P-47's, and I like it!
I had read that the trial P-47N extended wing was also flown on the P-47K but I'd never seen a photo until today.
Thats a great find!
I've had a go at sharpening the photo and it does look as though a dorsal fin has been fitted.
You can see the sharp line which runs across the window frames, which fits the angle that a "sharp" dorsal fin would run.

It also looks like the serial number is present on the tail which would suggest that the photos showing the fusalage star and bar in the rear position could well be later than the standard position photos perhaps?
A couple of other details you might like to consider in relation to converting an N model.
The N's were fitted with the C series engines, which features the different shape crankcase on the front of the engine. The P-47K would have the earlier type fitted. (R2800-63)
Heres a link which explains more about P+W 2800's installed in P-47 batches.
2800's and magneto types in P-47 batches
The N would also feature the later "flat" floor in the cockpit, while the P-47K had the earlier type corrugated floor.
Finally, dive flaps would be present on the P-47N,( They were introduced on the D-30 batch onwards), and with the N wing being developed mainly to incorporate extra fuel tanks I doubt very much they would have been considered on the P-47K at that early stage of development. With that in mind is probable that the landing light would still be in its original position by the wheel well.
How much of that detail you choose to incorporate is entirely up to you of course.
I hope your planning on showing us some photos of the build.
I'm really interested to see how it turns out!

I'm almost done with the cockpit on my build and should be posting photos soon. After the cockpits finished then I hope to have the main airframe together very quickly and can start the paint job!
All the best,
Nige
jguignard
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Posted: Friday, January 29, 2010 - 09:01 AM UTC
Hi Nigel:

You are right about the engine and cockpit for the N. I actually have not done any work on the model in a couple of weeks, and even then only on the wings and fuselage halves. I broke out the kit and looked at the engine and cockpit parts. As it turns out, Academy goofed - the engine as well as the cockpit parts are appropriate for a P-47D - I guess the same parts that are in their P-47D kit. So it looks like I won't have to mess with the cockpit and engine at all - other than possibly having to get the engine to fit in the Tamiya cowl.

Roger Freeman did two different books on the P-47, and that picture is in both of them. Looking forward to seeing your completed XP-47K

Jim
lampie
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Posted: Sunday, January 31, 2010 - 07:50 AM UTC
Definately a case of "not seeing the wood for the trees".
The photo of the P-47K with the "N" wing appears on P62 of Roger Freemans "Documentary History".
You can clearly see the dorsal fin and the serial number (28702)

The cockpit is always a bit of a long slow process for me but now its done I can get moving on this.
A couple of shots before I close everything up.



Fusalage halves together. Wings dry fitted as is the cowling.
As expected, the Loon models cowling fins fit without any problem at all.



Nige
lampie
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Posted: Saturday, March 13, 2010 - 10:54 AM UTC
Time to get stuck into this and a couple of other builds which I would like to have finished for the show at RAF Cosford in a few weeks.
The underside is sprayed and since I took this I've made a start on the masking. Plan is to get the olive drab on over the next couple of days.

Nige
lampie
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Posted: Tuesday, March 16, 2010 - 08:20 AM UTC
A base coat of Tamiya XF62 with a thin overspray of 70/30 Olive Drab/Zinc Cromate(XF4) to break up the overall colour.
Odd seeing a bubbletop in OD/NG with a "toothpick" prop.
It'll look even stranger with red bordered national insignia!


Next job will be a couple of coats of Klear as a base for the decals.
Nige
PRM741
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Posted: Tuesday, March 16, 2010 - 10:34 AM UTC
Looking good...........
AussieReg
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AUTOMODELER
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Posted: Tuesday, March 16, 2010 - 11:51 AM UTC
Looking great Nige, and thanks for the mix ratio on the overspray. I'll be borrowing that for my next OD build for sure !!

Cheers, D
lampie
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Posted: Tuesday, March 16, 2010 - 12:32 PM UTC
Cheers guys
Damian, the 70/30 mix is usually the first stage of fading the olive drab that I use. However, with the P-47K not being subjected to the glorious English weather I decided to just break up the finish rather than fade it.
For a full "fade" the process is.
1.Pre shade in black.
2. Olive drab base coat.
3. 70/30 XF62/XF4. Very thin and misted randomly.
4. 50/50 mix,very thin. "fill in" the panels.
5.10/90. even thinner mix. Streaks in direction of the airflow and "blotches" on the fusalage sides to blend everything together.
Coats of Klear will darken everything and blend it together even more, and when you apply the matt varnish,(after washes and post shading etc), the full effect is revealed.
On the undersides I use white with the neutral grey.
I got the idea originally from the Osprey book on modelling the P-47 a few years ago and once youve used it a few times you tend to find out what works best for you.
Its a very easy and effective method to bring a paint job to life.
Nige
Fledermaus
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Posted: Wednesday, March 17, 2010 - 08:27 AM UTC
Nige,

The paint job came out very well and the fading is subtle. You have definately mastered this airbrush technique.

Is the OD free hand or did you mask where it meets the gray? How did you mask it if that is the case?

Thanks.

Matt
lampie
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Posted: Wednesday, March 17, 2010 - 08:34 AM UTC

Quoted Text

.

Is the OD free hand or did you mask where it meets the gray? How did you mask it if that is the case?

Thanks.

Matt



Thanks Matt.
The OD/NG demarcation line is masked.
I use BluTac for this, rolled into thin sausages and laid along the line. The rest of the model is masked with tape.
Nige
md72
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Posted: Wednesday, March 17, 2010 - 09:42 AM UTC
Looks great Nige!
I may try to steal your finishing technique if I can remember it when I'm ready...
lampie
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Posted: Friday, March 19, 2010 - 09:16 AM UTC

Quoted Text

Looks great Nige!
I may try to steal your finishing technique if I can remember it when I'm ready...



Thanks Mark.
You'll enjoy the fading process and it really does make a huge difference to the overall look of an airframe.
Back to the P-47K, and the main decals are on.
I was right, a bubbletop does look very odd with red bordered national insignia, but I like it!


Nige
Sustineo_Alas
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Posted: Friday, March 19, 2010 - 10:53 AM UTC
Nige, thanks for your Tamiya color(s) "tricks"! I'm starting to make the transition to using Tamiya acrylics exclusively and this will most definitely help me out. As usual, great job on the build so far!

John
lampie
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Posted: Thursday, April 08, 2010 - 05:13 AM UTC
All finished.
It took a while longer than I was expecting as the decals for the national markings were slightly translucent when applied on a darker colour so I had to add another decal on top. The fusalage insignia were cut from full star and bars.
A nice easy conversion, just a generic AM decal sheet and a Loon Models early D cowling and the result is an unusual addition to the display cabinet.





Nige
md72
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Posted: Thursday, April 08, 2010 - 05:36 AM UTC
Looks good!

I'm close to kicking off a P-40E with OD/NG finish and maybe it will look almost good based on this information.