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Older Kitfox setting RPM

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Malcolmbru(at)aol.com
Guest

Posted: Thu Dec 21, 2006 7:48 pm Post subject: Older Kitfox setting RPM

I have a mod 2 and seem to have a wondering RPM  motor speed trimming  and setting angel of attack seems like an endless task. what to  do?  582  gsc prop Max 6200 on climb  mal michigan kitfoxer  

  [quote][b]

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roncarolnikko(at)hotmail.
Guest

Posted: Thu Dec 21, 2006 8:41 pm Post subject: Older Kitfox setting RPM

Mal I set the max rpm to 6800 on my 582 with GSC.  This will cost you some 

top end though.  Ron NB  Ore

 	  Quote: 	
		  From: Malcolmbru(at)aol.com

Reply-To: kitfox-list(at)matronics.com

To: kitfox-list(at)matronics.com

Subject: Re: Older Kitfox setting RPM

Date: Thu, 21 Dec 2006 22:48:02 EST

I have a mod 2 and seem to have a wondering RPM  motor speed trimming  and

setting angel of attack seems like an endless task. what to  do?  582  gsc 

prop

Max 6200 on climb  mal michigan kitfoxer

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Aerobatics(at)aol.com
Guest

Posted: Thu Dec 21, 2006 10:46 pm Post subject: Older Kitfox setting RPM

I have a 582 Blue head on a E box and IVO 3 Blade on my KF-2 .  6,800  is what Lockwood said it should be.  I was asking because I was at 6,200  and was happy.  They said I was giving up a lot of HP at  6,200.    Took a bit of pitch out of my IVO and it went to 6,400  to 6,450.  It was a big improvement. I havent changed it since.  I  might take some more pitch out someday...

  

 These 2 strokes are a bit peaky and like to rev.  Easier on engine but  this topic has been there before...

  

 Personally, I think 6,400 to 6,800 is ideal.

  

  

 Dave

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Fri Dec 22, 2006 4:32 am Post subject: Older Kitfox setting RPM

Hey Dave, 

  

 Are you setting for 6800  wide open straight and level ?

 and what are you getting static?   

 I set mine with a combination of RPM , EGTS with needle adjustment as  necessary. Fuel flow increases with Needle clip change. 

  

  

  

  

 Dave 

  

  

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Fox5flyer
Guest

Posted: Fri Dec 22, 2006 5:01 am Post subject: Older Kitfox setting RPM

Malcolm, a large part of the wandering trim and rpm is that the model II  being so light and with a low torque motor results in low  overall inertia.  Very small air currents and bumps will affect  it.  Heavier airplanes with higher torque engines are much less prone to  this.

 It's normal.

 Deke

  

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Aerobatics(at)AOL.COM
Guest

Posted: Fri Dec 22, 2006 6:39 am Post subject: Older Kitfox setting RPM

In a message dated 12/22/2006 6:34:09 A.M. Central Standard Time,  dave(at)cfisher.com writes:

  	  Quote: 	
		     Hey Dave, 

    

   Are you setting for 6800  wide open straight and level ?

   and what are you getting static?   

   I set mine with a combination of RPM , EGTS with needle adjustment as    necessary. Fuel flow increases with Needle clip change. 

    

    

    

    

   Dave 

	


 

 6,800 in a climb at 55 MPH.  I will exceed VNE in level flight at  WOT.  As far as needle settings, its stock, unless its very hot or cold,  then I might change it.   Stock needle setting yields about 1050F  in WOT climb.  1200F at 5,600 to 5,800 RPM cruise which is about 75 to  80 mph actual. The EGT climbs at cruise naturally at cruise. fuel flow is what  it needs to be to keep EGT in proper range. 

  

 I might add I have faired all lift struts, even the gas caps. It makes  a big difference in speed.

  

 Running these 2 strokes is all about proper EGT and proper RPM.  The  final word is the color of the plug. 

  

 I highly recommend consulting a good Rotax dealer.

  

 These 2 strokes may not be the most fuel efficient, but they have best  power to weight!

  

 Dave

  

  

  [quote][b]

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Fri Dec 22, 2006 7:12 am Post subject: Older Kitfox setting RPM

Dave, thanks for info. 

  

 what is your vne ?  

  

 I use GPS to get my speeds  

  

 What is temperature you get those numbers at ?  in cooler temps I  would 1300F  + running that fine  on  582 . 

  

 yes i strongly agree- trust your plugs.  PS -- mine over 100 hours  now  on 582  got in 1.8 hours yesterday and still seem  good  .

  

 Dave

  

  

 [quote]   ---

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Aerobatics(at)aol.com
Guest

Posted: Fri Dec 22, 2006 8:48 am Post subject: Older Kitfox setting RPM

In a message dated 12/22/2006 9:13:40 A.M. Central Standard Time,  dave(at)cfisher.com writes:

  	  Quote: 	
		     Dave, thanks for info. 

    

   what is your vne ?  

    

   I use GPS to get my speeds  

    

   What is temperature you get those numbers at ?  in cooler temps I    would 1300F  + running that fine  on  582 . 

    

   yes i strongly agree- trust your plugs.  PS -- mine over 100 hours    now  on 582  got in 1.8 hours yesterday and still seem  good    .

    

   Dave

	


 

 Well A GPS is a must for accurate #s   

  

 Personally, my plugs would never see more than 50 hours, typically I change  them around 30.  They are cheap and I notice a small improvement in idle  whenever I plug new ones in. I suggest following the Rotax manual.

  

 VNE is 100

  

 I fly in East Central Illinois. About 100 Miles S of Chicago. We see a WIDE  range of temp and Humidity.  When flying cross country I fly at 5,000 ft or  so. Local around 3,000.  In cold weather, 30F to 0 F,  obviously  the EGT climb and in hot they drop.  They highest I have seen is 1,350 at  cruise. Raised the needle one notch and it dropped 50F. Personally I dont want  to see over 1,300 ever.  1,200 to 1,250 is comfortable to me.

  

 I just took my engine to "theultralightplace.com" in Kankakee for its 300  hour medical.  Doc Jim Leon said whatever your doing keep on doing  it.  He specializes in 582 and really knows these engines.

  

 So, for me, this combo seems to work well.

  

 Best

  

 Dave

  

  

  

  

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