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Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63")

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hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Tue Oct 24, 2006 3:45 pm Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63")

Gentlemen:  

<![if !supportEmptyParas]> <![endif]>  

I am getting all types of input concerning setting the prop pitch for my Allegro 2000, which has a 912 UL engine and a Woodcomp, 3 blade, Klassic 160 (63”) prop. I have gotten recommendations everywhere from 14� to 20�. This is quite a variation for prop pitch. I have tested the engine (Static Test) for two pitch settings and the rpm results as indicated by the engine tach are as follows:  

<![if !supportEmptyParas]> <![endif]>  

17.5� Pitch = 4600 engine rpm  = 65 engine hp* = 40 propeller hp*  

<![if !supportEmptyParas]> <![endif]>  

16.5� Pitch = 4900 engine rpm = 70 engine hp* = 47.5 propeller hp*  

<![if !supportEmptyParas]> <![endif]>    *see graph on page 10-3      of the Rotax Operator’s Manual   

<![if !supportEmptyParas]> <![endif]>  

These numbers don’t appear to reflect an efficient use of engine horsepower to prop horsepower. Seems to me that the higher the static rpm (up to 5800 rpm) the more efficient use of the engine/propeller combination. Therefore, one would think that setting the Prop pitch to obtain a static max rpm of 5700 rpm would be the best choice. To do this the pitch would have to be reduced below 16.5� (in my case). It is interesting to note that the tech at Fantasy Air USA (Distributor for the Allegro) tells me they set all of their props at 14� pitch. I am going to reduce my pitch to 14.5� and conduct another static test to see what rpm I get on the engine at max throttle. Any comments or suggestions concerning this?  

<![if !supportEmptyParas]> <![endif]>  

Hugh McKay  

Allegro 2000  

912UL  

N661WW  

<![if !supportEmptyParas]> <![endif]>  

        [quote][b]

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daveaustin2(at)can.rogers
Guest

Posted: Tue Oct 24, 2006 3:55 pm Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63")

Hugh,

 I'd recommend you set the prop to get 5000 rpm  static.  With that you will find that you still have to keep an eye on the  rev counter as you climb out so as not to exceed the 5800.

 IMHO that is a good setting to start.  You  will probably want to coursen up a couple of degrees to get good cruise  later.

 Dave Austin  601HDS - 912, Spitfire Mk  VIII

     [quote][b]

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propellerdesign(at)tele2.
Guest

Posted: Wed Oct 25, 2006 5:44 am Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63")

Hi

  

 You are supposed to climb at Vy with WOT without  over revving.

  

 Best speed is achieved if you prop it for 5800 at  WOT horizontal flight, at your normal cruising alt.

  

 Some over-reeve for better climb.

  

 or to 5500 at 7500� WOT for max  cruise.

  

 Jan Carlsson

 www.jcpropellerdesign.com

  

 [quote]   ---

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dave(at)dreamwings.co.za
Guest

Posted: Thu Oct 26, 2006 6:14 am Post subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 (63")

Hugh,



My Allegro has the 80hp 912 and I've set my prop for 5000rpm static.  The 

prop is a KievProp 263.  If you set up for 5700 static, you will definately 

get great takeoff and climb performance because as you will be getting 

almost max hp out of the engine.  But in cruise you will have to throttle 

back a long way to get reasonable cruise rpm and your cruise speed will 

suffer.  With the 80hp engine and my 5000rpm static setting, she still 

climbs well and then gives me around 100mph at 5000rpm cruise.  If you are 

concerned about takeoff performance on your fist flight, set her up for 5200 

static.  I'm sure after a few flights you will find yourself making it a bit 

courser.  I would not set it for 5700 static, especially for the first 

flight.  There is high enough work load on a test flight without having to 

worry about over revving the engine as well.



Regards

Dave

Durban, South Africa



 	  Quote: 	
		   From: "Hugh McKay III" <hgmckay(at)bellsouth.net>

 Subject: Rotax 912UL/Woodcomp 3 Blade, Klassic 160 

 (63")



 Gentlemen:



 I am getting all types of input concerning setting the prop pitch for my

 Allegro 2000, which has a 912 UL engine and a Woodcomp, 3 blade, Klassic 

 160

 (63) prop. I have gotten recommendations everywhere from 14 to 20. This

 is quite a variation for prop pitch. I have tested the engine (Static 

 Test)

 for two pitch settings and the rpm results as indicated by the engine tach

 are as follows:



 17.5 Pitch = 4600 engine rpm  = 65 engine hp* = 40 propeller hp*



 16.5 Pitch = 4900 engine rpm = 70 engine hp* = 47.5 propeller hp*



 * *see graph on page 10-3 of the Rotax Operators Manual



 These numbers dont appear to reflect an efficient use of engine horsepower

 to prop horsepower. Seems to me that the higher the static rpm (up to 5800

 rpm) the more efficient use of the engine/propeller combination. 

 Therefore,

 one would think that setting the Prop pitch to obtain a static max rpm of

 5700 rpm would be the best choice. To do this the pitch would have to be

 reduced below 16.5 (in my case). It is interesting to note that the tech 

 at

 Fantasy Air USA (Distributor for the Allegro) tells me they set all of 

 their

 props at 14 pitch. I am going to reduce my pitch to 14.5 and conduct

 another static test to see what rpm I get on the engine at max throttle. 

 Any

 comments or suggestions concerning this?



 Hugh McKay

 Allegro 2000

 912UL

 N661WW

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