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stunthanger.com
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Engine basics
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OS Max 20
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Topic: OS Max 20 (Read 1743 times)
Bill Hodges
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OS Max 20
«
on:
February 17, 2006, 08:18:34 AM »
I have an old OS Max 20 that I mounted on our club trainer. It is not the FP. Could someone enlighten me on what fuel to use in this engine?
Bill Hodges
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Bill Hodges
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RandySmith
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Re: OS Max 20
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Reply #1 on:
February 17, 2006, 09:26:11 AM »
HI Bill
If you get SIG fuel, the 25% castor would work well in that engine
Randy
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Bill Hodges
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Re: OS Max 20
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Reply #2 on:
February 17, 2006, 12:51:22 PM »
Thanks Randy. I just happen to have a couple of gallons in the shop.
Bill
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Bill Hodges
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Chris Gilbert IRL-1638
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Re: OS Max 20
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Reply #3 on:
March 06, 2006, 06:45:02 AM »
Hi Guys,
I dug an OS max 20 out of my attic, but I've no idea as to what propeller to put on it.
First flight was 9x4, followed by a 9x6, with disasterous consequences (more firewood)
Any advice?
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Steve Helmick
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Re: OS Max 20
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Reply #4 on:
March 06, 2006, 11:39:32 PM »
Most .19-.25's run happily on a 9-4. I'd suggest trying APC, Taipan and Graupner "GRP" props. "GRP" stands for Glass Reinforced Plastic. The fiberglass makes them stiffer, more efficient, and more brittle. But they hold up a lot better than wood props to grass fields, and are generally pretty consistent from sample to sample.
Steve
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Chris Gilbert IRL-1638
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Re: OS Max 20
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Reply #5 on:
March 07, 2006, 12:31:37 PM »
Thanks guys. Will have to add some 9x4s to my next shopping list.
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