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Best prop for an OS91 on the Cermark F-18

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Old 05-22-2007, 09:08 PM
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lonzotwa
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Default Best prop for an OS91 on the Cermark F-18

Hello,
Just wanting some info on the best prop to use on my OS91 installed on the new Cermark F-18. I only have 7 inches from the ground to the center of the engine shaft with the original nose wheel installed. If I install a 2 1/2 inch wheel, I have 7 3/4 inches. According to the OS manual, they recommend a 15 inch prop which will not fit. I guess I am a little worried about burning up the engine with a prop that is too small.

Any input is appreciated

By the way, a very sweet model.
I was sent the wrong nose wheel (to short) and my kit was missing the spinner but Cermark took care of me and shipped them right out.
I cant wait to get it in the air.

Lonny
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Old 05-22-2007, 09:29 PM
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Big Daddy-RCU
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Default RE: Best prop for an OS91 on the Cermark F-18

You want to use a 12x8 prop.
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Old 05-22-2007, 09:53 PM
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Default RE: Best prop for an OS91 on the Cermark F-18

....yep.
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Old 05-22-2007, 10:08 PM
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soundmaster
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Default RE: Best prop for an OS91 on the Cermark F-18

How About an EVO 100?? Just ordered the F-18 and have an evo laying around so i was thinking of using that what do you think? If i go with that what should i use for a prop?
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Old 05-23-2007, 07:04 AM
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MattyC-130
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Default RE: Best prop for an OS91 on the Cermark F-18

OS 91, Ultra Thrust or Jet Stream Muff. and APC 12X8
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Old 05-23-2007, 10:03 AM
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Default RE: Best prop for an OS91 on the Cermark F-18

Same thing on the Evo ..... 12x8 or 12x9
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Old 05-25-2007, 04:44 PM
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Default RE: Best prop for an OS91 on the Cermark F-18

It looks to me that the EVO 100 is 10oz heavier then the 91 which is ok cause it is a bit bigger but i am wondering about Power output. The os 91 is 2.8hp at 15000 rpm but i cant find any data on the Evo. Anyone know about what it puts out? If it is more then the os by a lot then i will keep it if not... then i will go with the os.
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