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Author Topic: OS Max 20  (Read 1714 times)

Offline 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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Offline RandySmith

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Re: OS Max 20
« 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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Offline Bill Hodges

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Re: OS Max 20
« 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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Offline Chris Gilbert IRL-1638

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Re: OS Max 20
« 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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Offline Steve Helmick

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Re: OS Max 20
« 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.  8) Steve
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Offline Chris Gilbert IRL-1638

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Re: OS Max 20
« 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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