Senior Master Sergeant
- Jan 18, 2011
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Glenn, I am very sorry to hear about the problems you had with the resin bubbles. I made that conversion set (aka fastrodney) and with the resins I use (without a vacuum system), I do get a lot of bubbles below the surface. I wish you had contacted me about your problems, because at least one of them I could have easily solved.
That drawing that you were using as a reference is totally wrong. I also ran across it when researching this project. I believe it is from one of those Eastern European publications, which are usually pretty good, but if you take a close look at photos of the actual aircraft, it is clear that the cowling is NOT circular in cross section.
It is circular at the front but much deeper towards the back. If you superimpose a R-4360 onto a side view photo, this will be very clear.
Trying to modify the parts to match that bad drawing would certainly cause a lot of unnecessary problems. The resin parts should only need some light scuffing with 800 grit for priming, which wouldn't bring any bubbles to the surface. Using that bad drawing would also put the ventral intake too high up.
Here are a couple of photos that shows how the model should end up.
Here's also a drawing of the special landing gear design that applies to the XP-72 and XP-47J.
Probably too late now, but I can make you a vacuform ventral tunnel if that helps!
I did a LOT of research in creating this conversion set, but there is plenty of bad information out there on the web and it takes a lot of work to separate the bad from the good!
Way back in my college days I was taught to always go to primary sources (such as wartime photos and factory drawings) when possible and be wary of secondary sources (much of the stuff you find on the internet)
BTW, that Koster 1/48 conversion is apparently based on that same bad drawing. The 3-view drawing in William Green's "Fighters, Vol 3" from 1961 is far more accurate.
A bit long-winded, perhaps, but as a general rule, if it matches actual photos
it's a good model!