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Rotax 912ULS Prop Settings

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Mon Jun 06, 2011 8:19 am Post subject: Rotax 912ULS Prop Settings

I have been adjusting, then flying the RV-12 with  trial and error Sensenich ground-adjustasble prop blade settings. I believe I  now have the prop about where it should be. Here are the results of today's  trial from KANK airport at  7525-ft msl, density altitude  9,800-ft:

  

     Take off climb at 68-mph WOT  showed 5,040 rpm (climb rate 650 fpm +)

     Level flight at 8.870-ft   msl showed 5,550 rpm

     Two 180-degree legs  showed:

         IAS  110/110

         TAS  129/127

         GPS  142/121

  

 Will leave things as they are and check again from  time to time.

  

 Thanks, Roger for your information regarding this  sort of thing.

  

 John

   [quote][b]

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lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Tue Jun 07, 2011 5:18 am Post subject: Re: Rotax 912ULS Prop Settings

 	  JohnF wrote: 	
		  I have been adjusting, then flying the RV-12 with  trial and error Sensenich ground-adjustasble prop blade settings. I believe I  now have the prop about where it should be. Here are the results of today's  trial from KANK airport at  7525-ft msl, density altitude  9,800-ft:

  

     Take off climb at 68-mph WOT  showed 5,040 rpm (climb rate 650 fpm +)

     Level flight at 8.870-ft   msl showed 5,550 rpm

     Two 180-degree legs  showed:

         IAS  110/110

         TAS  129/127

         GPS  142/121

  

 Will leave things as they are and check again from  time to time.

  

 Thanks, Roger for your information regarding this  sort of thing.

  

 John

   	




Sounds slightly overpropped to me? I think rotax wants at least 5200 rpm when running at WOT so 5000 sounds like its lugging a bit?



I too fly at a high altitude (northern new mexico, where the ground is about 7000' MSL) so I prop my 912ULS (titan tornado) for climb at about 5200 at Vx (65 to 70mph) and it unloads to about 5400 at 80mph. OTOH, my prop is gigantic, a powerfin F model, 70" 3-blade. The powerfin is notorious for having a narrow speed range, in my experience, but nothing generates better climb performance. So it'll easily hit redline in level flight when pitched for good climb. 



Anyway, just a thought? I'd think 5000 would be a bit too heavy....



LS

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_________________
LS
Titan II SS

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