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Re: Koster/Monogram XP-72

Posted: Thu Jul 21, 2022 4:35 pm
by LyleW
Looks quite nice!

Re: Koster/Monogram XP-72

Posted: Mon Jul 25, 2022 10:31 am
by Medicman71
Very well done! :shoutout:

Re: Koster/Monogram XP-72

Posted: Thu Jul 28, 2022 6:20 pm
by jeaton01
Getting close on this one. If I was a real modeler I would spend a few more hours on the props, the resin parts were pretty rough by modern standards.

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Re: Koster/Monogram XP-72

Posted: Thu Jul 28, 2022 6:34 pm
by LyleW
That it cool!

Re: Koster/Monogram XP-72

Posted: Thu Jul 28, 2022 7:16 pm
by Stikpusher
Looking good! The side shot showing the profile reminds me of the Raiden with the elongated cowling.

Re: Koster/Monogram XP-72

Posted: Fri Jul 29, 2022 4:55 am
by tempestjohnny
The side shot looks "different" without the vent doors

Re: Koster/Monogram XP-72

Posted: Fri Jul 29, 2022 7:02 pm
by jeaton01
Thanks, all. Yes, it does look different without those doors that always complicate the insignia decals on the P-47's. But you do get those oil cooler/intercooler exit doors down below!

I painted the stainless areas around the cowl flap gills and installed some brass rod for the guns. The XP-72 was going to have only six 50's instead of the usual 8 and the inner one was located further back in the wing. Also, if it had gone into production it would probably had the same wing as the P-47N. The last photo shows it with the ProModeler P-47N. What a couple of brutes!

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Re: Koster/Monogram XP-72

Posted: Fri Jul 29, 2022 7:27 pm
by Greg
Interesting project. Well done, John!

First I'd heard of the fiberglass trick too. Clever idea. Where does one procure small quantities of the proper thickness? And I understand that you just used CA to reinforce it, right?

Re: Koster/Monogram XP-72

Posted: Fri Jul 29, 2022 8:05 pm
by BlackSheep214
What a difference between the two Thunderbolts. One is the Jug and the other looks like a race car aircraft - sleek and aerodynamic shaped. I wonder why they chose the 6 bladed propeller as opposed to the typical 4 blade prop of the P-47.

Re: Koster/Monogram XP-72

Posted: Fri Jul 29, 2022 10:10 pm
by jeaton01
Tom, it's all about absorbing horsepower. There's an obvious limit to how large the diameter of a prop can be, and when designers reach that they have to add more area to the existing blades or add more blades. Conta-rotating blades are a way of doing that, and they also aid stability by eliminating torque and p-factor, at the cost of weight and complexity.

Greg, I use fiberglass cloth of various weights to make parts for R/C airplanes. Tap Plastics have it, and it used to be pretty available at R/C hobby shops. .6 ounce is pretty light for boat work but they might also carry it. Another product that might also work well and is newer is carbon veil, a very thin nondirectional weave of carbon fiber. It also adhers very well with CA.