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Cuyuna 430 and Pterodactyl

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mshimei(at)bellsouth.net
Guest

Posted: Sat Jun 27, 2009 8:49 pm Post subject: Cuyuna 430 and Pterodactyl

Does anyone know the  proper belt tension for the 4 belt drive? About how much flex in the middle in  inches(or MM)

  

 My Cuyuna turns up  5750 at T.O. and 5950 max cruise.Ultrastar climbs out at 700 FPM,cruise 5000 RPM  at 50mph,CHT around 290 deg.Takes off in 80' with a little headwind on  concrete.

  

 I know it needs less  pitch(has an Ultraprop 3 blade 48") but it flies great. Am I loading it down too  much?

  

  Thanks,Mark.....Ultrastar with 30hrs since  March

   [quote][b]

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Jun 28, 2009 5:29 am Post subject: Cuyuna 430 and Pterodactyl

The Kolb belt drive used two poly-V belts on the  Ultrastar and Cuyuna ULII02.  I don't know about 4 belt  drives.

  

 Kits came with a Culver 50X30 prop.  This was  a near perfect prop for the US.  I imagine Valley Engineering is probably  still carving that particular prop.

  

 john h

 mkIII

 [quote]    

   Does anyone know    the proper belt tension for the 4 belt drive? About how much flex in the    middle in inches(or MM)

    

   I know it needs    less pitch(has an Ultraprop 3 blade 48") but it flies great. Am I loading it    down too much?

    

    Thanks,Mark.....Ultrastar with 30hrs since    March

 	  Quote: 	
		  

 	
[b]

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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