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ST 46 prop

Old 01-13-2017, 08:34 PM
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mashp39
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Default ST 46 prop

I am using a 10/6 prop on a ST 46. If I change to a 11/6 prop what affect will I see? Overall speed or will it slow down on landing?
Old 01-15-2017, 07:56 PM
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mashp39
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OK, it was a dumb question. I will do the change and let you know the answer.
Old 01-16-2017, 06:38 PM
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jester_s1
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Not a dumb question. Changing props affects two things- the load on the engine and the flight characteristics of the plane. You'll see a noticeable RPM drop and maybe lowered overall performance if the engine can't get into its happy RPM place. You'll definitely see better acceleration and faster deceleration, less straight line speed, probably better vertical performance (but maybe not if the engine can't make power) and definitely less noise. You may find that one brand of 11x6 flies noticeably better than another. You also may find that you need to go to an 11x5 to let your engine unwind like it needs to.

So what are you looking to get from the switch?
Old 01-20-2017, 05:42 AM
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mashp39
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Just fooling around. Thought I would try it.
Old 01-20-2017, 07:16 AM
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Hi!
Getting the right prop is important. Best prop brands for all glow engines are: APC, RAM and Graupner G-Sonic.
Old 01-20-2017, 08:53 AM
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We'd normally use a 10 x 7 or 10 x 8 prop on a .45-.46 engine. The G-45 and GS-45 engines run well when they are allowed to turn up. An 11 x 6 prop does well, too. A 10 x 6 prop allows the engine to turn up a bit more than needed, but would help climb and vertical a lot. An 11 x 6 will turn lower RPM and also make the airplane fly at a slightly slower speed, but be good for vertical. The 10 x 7 is likely a very good all-around propeller. You really need to try and see which one flies the airplane the way you want it to fly.
Old 01-20-2017, 08:13 PM
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mashp39
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OK, I flew with the 11/6 today.I believe it was a bit slower than the 10/6. Other than that no difference I could see. Did loop,inverted, and roll. Just did laps around field. Maybe slower on landing. I will go back to the 10/6 but will try a 10/7. I was just trying something different. Thanks for the comments. The plane is a Sig Kouger Mark II with an OS 46 FX. I was using a ST 46 but changed engines just to compare. I believe the ST has a bit more power but too much changing to bother. The plane flies great and lands with no problems even in mildly gusting winds. Good plane to have.

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