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RPM/912

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redrocketrider

Joined: 13 May 2011
Posts: 67
Location: Nervino airport

Posted: Sun Jul 03, 2011 6:38 am Post subject: RPM/912

Hello Kitfox flyers, For  those of you who have the 912 and 3 Blade 68" GSC prop, Do you see more than 5K  RPM or more on take off from field elevations of 5K, we typically see 8 to  9 K density alt days up here in the High Sierras.  So from sea level we  lose 5" Manifold pressure. Our kit fox is only able to turn 4500 Rpm static at 5  K field elevation and stays about the same on climb out, the prop pitch is 15  degrees. Any and all comments are welcome and we appreciate your input and  replies. Thanks  Bob and Toodie 

   [quote][b]

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Keep the dirty side down/Blue skies. Bob

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun Jul 03, 2011 7:35 am Post subject: Re: RPM/912

Hi Bob,



You should set the prop pitch to achieve 5500-5550 rpm WOT flat and level at your normal cruise altitude. This will give you the best all a round performance for all flight characteristics.  To much pitch like yours does equate to loss of climb, more fuel and higher engine temps. Too little pitch gives you good climb, but you loose cruise and fuel economy. Balance of all the flight characteristics is the key for normal flight operations. Don't get hung up on static it is just a starting point to getting things dialed in. You care more about WOT during flight.

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Roger Lee
Tucson, Az.
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Av8r3400

Joined: 22 Sep 2008
Posts: 83
Location: North Central Wisconsin (KRRL)

Posted: Sun Jul 03, 2011 11:12 am Post subject: Re: RPM/912

less than 5200 rpm with full throttle in a 912 leads to excessive cylinder pressure and could seriously damage your engine.



FYI

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Thanks,
Av8r3400

Kitfox Model IV-1200 W/912UL & IVO
Kitfox Model IV-1050 W/912UL & Warp
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clint_bazzill(at)hotmail.
Guest

Posted: Sun Jul 03, 2011 4:41 pm Post subject: RPM/912

Not at5 5000 feet with a MP of 24 inches



Clint

 	  Quote: 	
		   Subject: Re: RPM/912

 From: theav8rweb(at)yahoo.com

 Date: Sun, 3 Jul 2011 12:12:13 -0700

 To: kitfox-list(at)matronics.com

 

 --> Kitfox-List message posted by: "Av8r3400" <theav8rweb(at)yahoo.com>

 

 less than 5200 rpm with full throttle in a 912 leads to excessive cylinder pressure and could seriously damage your engine.

 

 FYI

 

 --------

 Thanks,

 Av8r3400

 

 Kitfox Model IV-1200 W/912UL &amp; IVO

 Kitfox Model IV-1050 W/912UL &amp; Warp

 

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=344799#344799

 

 

 

 

 

 

=========

 

 

 


	


 		 	   		  

  [quote][b]

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Av8r3400

Joined: 22 Sep 2008
Posts: 83
Location: North Central Wisconsin (KRRL)

Posted: Sun Jul 03, 2011 8:41 pm Post subject: Re: RPM/912

Altitude was never specified during the seminar that I got that information from.  Pressure differential from inside the combustion chamber versus the ambient pressure surrounding the engine is where the damage would come from, IMO.

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_________________
Thanks,
Av8r3400

Kitfox Model IV-1200 W/912UL & IVO
Kitfox Model IV-1050 W/912UL & Warp
YouTube Videos

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