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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!

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.

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
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.