OS 1.60 FX and 3-bladed prop - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-04-2006, 09:09 PM   #1
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OS 1.60 FX and 3-bladed prop

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Hi guys,

I have the CMP Extra 300S (72" WS) and a new OS 1.60 engine. I'd like to try a 3-bladed prop, but I'm not sure what size.

Has anyone flown with this engine and 3-bladed prop?? Any info would be greatly appreciated.


team kamikaze precision aerobatics
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Who cares, as long as it flies.
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Old 01-06-2006, 05:10 AM   #2
Don M.

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Since no one else will talk to you I'll tell you what I know. I have an OS 160 and use an 18 - 8 on it but always wanted to try a 3 bladed. I was at a FF one time and a guy was using a Graupner (spelling ? ) 16 - 8 3 bladed. It semed to pull well and I ask. He said it was OK, not as good as a 2 blade but almost, but he needed the ground clearance and didn't need all the power.
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Old 01-16-2006, 04:36 PM   #3
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A 3 blade prop is only good if you need ground clearance or are after a scale effect. you WILL lose porformance going this route. The reason full scale aircraft use multiple blades is to absorbe excess HP . Again this a ground clearance/tip speed issue. Your best performance will come from propping your plane with a pitch that best matches your speed envelope. Less pitch more dia. will yield better take-off and climb and lower speed, high pitch, low dia. will yield more speed but you will suffer on take-off and climb performance. All this at a fixed RPM of course, afterall we do not have unlimited power. The "right" prop for your engine is irellavant, as the airframe you mount it in will be the deciding factor, Cub, P-51,Extra-300, they will all use the same engine, but a differant prop size. Hope this helps.

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