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Old Sep 05, 2001, 06:35 PM
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newflyer's Avatar
Crowley, TX, USA
Joined Dec 1999
551 Posts
1/12 mustang

About 4 years ago I built a 1/12 P-51 intending to power it with a Norvel 061 glow. It came out VERY heavy. I fully sheeted the wings and used a can of silver sray paaint on it as well as landing gear. I never flew it. Anyway, this weekend I put a speed 400 direct drive on 8 cells in it with a Gunther prop and low and behold it flys! And rather well, too. Question is, it is perfect for a geared setup. I have a set of gears. Whats the best for this application propwise and ratiowise?
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Old Sep 06, 2001, 09:46 AM
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mattk17's Avatar
Dallas,TX
Joined Jul 2001
1,656 Posts
I don't have an answer but a suggestion. Find out the weight of your plane and then see what other similar weight arf planes are using for geared motor setups. I'm guessing something between a geared 280 and geared 400 size would be the ticket.

Just remember that geared motors are designed to swing bigger props which can require lots of ground clearance. I'd hate to ruin a nice scale mustang with oversized landing gear.
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Old Sep 06, 2001, 05:36 PM
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newflyer's Avatar
Crowley, TX, USA
Joined Dec 1999
551 Posts
That's one of the reasons I would like to go geared. Besides the extra duration, I have alot of clearance to the ground. Could swing a 8" prop no problem. I will try an 8x6 maybe 2 or 3:1 and see what happens. All up weight on this thing has to be at least 30 ounces. It's amazing that the 400 and the gunther prop even get it off the ground!
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Old Sep 06, 2001, 06:01 PM
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SchiessCo's Avatar
North Hills
Joined Nov 1999
6,073 Posts
Your Mustang would be perfect for a Turbo 450, 8x800AR pack and a 7x4/5 prop. My friendís 1/12 109 screamed with that combo. Iím flying a HOB Chee-Pass with the same combo and it flies very nicely at 30 oz. AUW.

If you go geared, consider a larger prop or a lower ratio. An 8x6 would probably work well with a 1.85:1 g.b..

Pete
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Old Sep 07, 2001, 07:21 AM
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geoff.sim's Avatar
Northamptonshire, UK
Joined Oct 2000
802 Posts
I have a 1/12 Spitfire that I used a sp.400 4.8v and 3.7:1 gbx (robbe planetary). Whilst it flew ok, it was a hard to launch due to the weight (32oz). I too, have come to the conclusion that direct drive permax 450 with a 7x3/4/5 prop (current pending) and 8x800AR's (or the new cp1300's!) is the way to go.

In fact, my original postings on Ezone suggested just that. However, I was headstrong and had to learn by my own experience.

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Old Sep 07, 2001, 08:27 AM
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Haldor's Avatar
Stavanger, Norway
Joined Feb 2000
7,999 Posts
I'm currently building a 1/12 scale P51 - the one published in MAN some time ago. Will use 8x CP1300 and a brushless DD 7x4 prop. AUW is expected to range from 28-32oz and input powerloading ~100W/lbs.
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