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Scale Don Smith P-51 Mustang

pawnshopmike

pawnshopmike

Staff member
Let me help you out Rob.

8686B4D0-D65C-415B-A33E-5D6FF1A47927.jpeg





 
acerc

acerc

640cc Uber Pimp
Do you know what a model the size your going to build weighs? Does anyone else have one that you know of and could ask? In short do you or anyone you know or have read about know if the weight is an issue either way?
As for the Kolm, if I remember your post correctly, they were still going to be in business. With the time span your build will take you will probably know what Kolm is before needing it. As for ventilation, I have used the Mustang scoop to route air to the rear side on an engine before and in a much smaller airframe than you are going to build, so that is an option with any engine.
No matter what you decide or direction you go we are here to support you with the best of wishes in this endeavor!
 
HRRC Flyer

HRRC Flyer

GSN Sponsor Tier 1
Dang Rob,

What a low blow that is, but you have the right idea. Take a step back, thoroughly think through all of your options. Then, for all the reasons you mentioned in your post on the previous page, call Gerhard and buy the twin red head. . . . :laughing:.

Just trying to help, Buddy. . . . . :yesss:
 
stangflyer

stangflyer

I like 'em "BIG"!
pawnshopmike said:
Let me help you out Rob.

View attachment 106653




Click to expand...
Ummm, Noooo! LOL

acerc said:
Do you know what a model the size your going to build weighs? Does anyone else have one that you know of and could ask? In short do you or anyone you know or have read about know if the weight is an issue either way?
As for the Kolm, if I remember your post correctly, they were still going to be in business. With the time span your build will take you will probably know what Kolm is before needing it. As for ventilation, I have used the Mustang scoop to route air to the rear side on an engine before and in a much smaller airframe than you are going to build, so that is an option with any engine.
No matter what you decide or direction you go we are here to support you with the best of wishes in this endeavor!
Click to expand...
Thank you. I really do appreciate that. Yes, you are correct. They will still be available according to Gotz. They will continue with the 150 triple, the 155 twin and the 230 triple. But it seems now "ONLY" direct from Kolm or their new "vendor"???? At least that is what I got from the statement and the long email I received from Gotz. And also correct, I did notice in many of the videos I watched, whether it was the Kolm, 3W or even the DLA 116, they did not have a butt load of air openings in the cowl to dirty the looks. In fact, the air deflection system for the Carf Mustang is actually well thought out and directs the air from the forward "chin" scoop around and through the carb side of the cylinders then pushes it through the exhaust side. Heck, there is even an air duct that is available that a guy can use to discharge the hot air through the fuse and out an exit. I even seen one that had an elaborate cooling fan system mounted next to the Kolm that blew air directly over the cylinders. So maybe cooling would not be a huge issue. As for weight issues, I really can't find anything from anyone that mentions anything. NOTHING. Which is really weird. No one mentions having to add weight, account for the heavy motors or otherwise. The 1 to 3 rule should stand good here. (every ounce on the tail equals 3 ounces on the nose) At least a starting point to work with. Apparently the Carf flies really well at 52 to 55 pounds. At least that is what I am seeing. But here is something I did not mention. The plans actually show a single cylinder 95cc engine up front. That is a pretty light motor comparatively speaking. And no where on the plans can I find anything mentioned about added weight. That said, with any other motor other than the one projected for this plane, it would add weight and need to be counter acted with balance ballast at the rear of the plane, right? At this point I could plan for both the Kolm and the 3w. The Kolm is 368.7mm (14.5") with starter just over 16 pounds and the Dub is 249mm (9.8") 7.69 pounds. I think engine choice is going to be a very key factor in building this plane right, strong and light. Perhaps I need to dig really deep and find what everyone did about balance and how to address it before I make an ultimate decision.

acerc said:
As much as I don't like electric that could be an option with the addition of an extremely good sound system.
Click to expand...
Again, Umm....NO!!! LOL
 
Snoopy1

Snoopy1

640cc Uber Pimp
Just my 2 cents. I would go with the 3W option. If I had owned several Kolm engines before I would go for the Kolm I would be familiar with the engine I knew what I am in for but as my first and no North American service or some one to phone up to get help and the price I would prefer to go with what I am familiar with. Also if like you say ships the engine back and forth to Europe is expensive and very time consuming before you know it the summer is past.
If I may suggest it is not something I pay especial attention to is large warbirds to but one thing if you go to JoeNull you bound to find somebody that can help you.
 
acerc

acerc

640cc Uber Pimp
There is a thread on RC Scale builder that covers a B version of the 112" model, no a lot but enough.
https://www.rcscalebuilder.com/forum/forum_posts.asp?TID=9236&PN=1&get=last#648439
Only one mentioned finished weight and power, 45lbs and powered by a Brison 5.8 turning a Mejzlik 25x12.
There was mention of a Valach 120 inline but he could not spare the expense. So go with the Valach, a bit smaller, a lot lighter, and still a great sound..
 
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