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Rotax 912-S flyers, What RPM do you look for on Climbout ?

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Fri Dec 29, 2006 8:25 pm Post subject: Rotax 912-S flyers, What RPM do you look for on Climbout ?

I have been reading the Rotax manual and it says the RPM limit is 5500 - 5800 for only one minute, and continuous below 5500 RPM.    Are you guys proping your planes to takeoff and maximum rate of climb speed below 5500 RPM at full throttle ?  Or are you seeing higher RPM's than that and pulling the power back in the climb ?



Thanks,

Mike

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wingnut

Joined: 11 Jan 2006
Posts: 356

Posted: Sat Dec 30, 2006 7:48 am Post subject: Re: Rotax 912-S flyers, What RPM do you look for on Climbout

1 min? My operator manual reads 5 min. 



I pictch my IVO prop for max RPM at takeoff. The actual RPM will vary with weather but I do occationally see 5800. When I do, I throttle back to 5200 about 100ft before pattern altitude, pitch the nowse down a touch and start the cross wind turn. This usually happens around the end of the runway. I do this because my prop is adjustable in flight. If I didn't have that, I'd probably pitch it for 5500 at takeoff. Even at that setting, it's still very easy to overspead during level flight.

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rdmac(at)swbell.net
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Posted: Sat Dec 30, 2006 10:23 am Post subject: Rotax 912-S flyers, What RPM do you look for on Climbout ?

Hi Wingnut,

I run a Rotax 912uls 100 horse with a GSC 68 inch 3 blade. My prop is

pitched so I see about 5400-5500 at WOT on climb. And I cruise between 5000

and 5200.

	Roger Mac

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