Optimizing Prop Size - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-31-2011, 05:23 PM   #1
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I am: Ken L
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Optimizing Prop Size

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I am using an OS 50 Hyper with a TopFlite 11 x 6 "Power Point" prop fueled by 22% Cool Power. Seems to run well at idle to full out, on the ground. Since this is my first plane, how does one know this is the best prop?? I assume that this can only be done after I learn to fly the GP Extra 300 SP and can't be done on the ground?? Or does it really matter to most beginners/sport fliers??

Thanks to those kind enough to reply.

I'll get some larger props to experiment with. The engine seems to have enough power to swing them.

I will get a trainer; I have asked for suggestions through another thread.

Last edited by tskca; 04-01-2011 at 01:55 PM. Reason: Advice taken
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Old 04-01-2011, 01:20 AM   #2
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Re: Optimizing Prop Size

so first of all if you have a os 50H that is a heli engine !
but it will work for a plane . i would tend to think that a 12x4 or a 12x6 would be best for that engine .
second of all
i hope that the extra 300 is not your first plane - you should learn on a trainer first .
Johnny ground pounder !
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Old 04-01-2011, 07:33 AM   #3
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Re: Optimizing Prop Size

Have to agree this is not anywhere near the best combination of prop/motor or plane for learning to fly. I also hope you were not planning on teaching yourself in that machine.

The 50 should swing at least an 11/8 and you should look into 10-15% fuel. The OS 50 was notorious for burning out the piston. I also imagine with that prop and fuel that engine is honking along pretty good. In fact, it might be revving too high.

As for the plane, this is a full out aerobatic machine and for experienced flyers. By design a trainer should resist and help recover from the inevitable beginner mistakes. The Extra follows EVERY command as crisply as possible for snappy maneuvers and will definitely do a goat without hesitation. I know showing up with a trainer to a field of experienced flyers may be akin to riding into a biker bar on a scooter, but in the beginning you have to start learning on an easy forgiving machine. I would put that plane in storage for the day you are ready for it.
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