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Slingshot thrust line/angle/HKS

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mccarthy(at)jefnet.com
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Posted: Mon Oct 25, 2010 8:44 am Post subject: Slingshot thrust line/angle/HKS

Thom,



I have done a lot of experimenting with thrust angle and thrust height on my slingshot.  Most of it started after I installed the Rotax 532 on my Slingshot and received help and advice from Ted Cowen.  If you email me your ph# and a good time to call, I will talk about it off list due to the amount of content involved.  As far as the testing with the Slingshot/HKS is going, I'm kind of at a stand still.  I'm having problems with EGT and CHT going to high. I think it is due to my custom exhaust or a ram air effect due to a forward carb style.  Work and weather are slowing progress down as well.  If it were not for the high temp problems, my experimenting would be complete.  I have turned the gear box down, added more height to the rear mount bringing it up about 1 1/2" total,  so the thrust line is parallel  to the flight line, and the 68" 3 blade Warp prop is about 3/4" from the boom tube.  The result is very nice.  I will report the actual numbers when I confirm with a GPS.  Early numbers are 4800rpm, cruise at 55mph, 5800rpm, cruise at 80mph, with climb 700fpm, with only slight back pressure through out the power range(no trim tab yet)

Tom McCarthy

     N514 TM  Zenith 601HD 

     N414 TM  Kolb Firestar 

     N863 GB  Kolb Slingshot 

 [quote][b]

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mccarthy(at)jefnet.com
Guest

Posted: Sun Nov 07, 2010 4:46 am Post subject: Slingshot thrust line/angle/HKS

 	  Quote: 	
		   	  Quote: 	
		        I have turned the 

      gear box down, added more height to the rear mount bringing it up about 

      1 1/2" total,  so the thrust line is parallel  to the flight line, and 

      the 68" 3 blade Warp prop is about 3/4" from the boom tube.  The result 

      is very nice.  I will report the actual numbers when I confirm with a 

      GPS.  Early numbers are 4800rpm, cruise at 55mph, 5800rpm, cruise at 

      80mph, with climb 700fpm, with only slight back pressure through out the 

      power range(no trim tab yet)

      

      Tom McCarthy

           N514 TM  Zenith 601HD 

           N414 TM  Kolb Firestar 

           N863 GB  Kolb Slingshot 

      

	
I wanted to report back to the list regarding this post.After finally solving my high EGT temp problems by blocking the ram air effect on Bings, I found after several hours of flight that slow cruise occurs at 4650 rpm giving 53 mph, and at the max continuous (5800 as per HKS) nets 84 mph. The best overall cruise occurs at 75 mph at 5300 rpm, where as the motor is very quiet and airframe is just cutting through the air with little resistance. I had a chance to do some short field work, and found that to be the weak link.  Climb is just not what I expected.  I have called Daryl at Warp to talk over the numbers, and he tells me that a 72" pitched down will out perform the 68" on there now with much better climb, without losing any top end, so I took the blades off and sent them in. The owner of the prop (quicksilver/ HKS) needs a 72" anyway so I have nothing to lose but my time. I hope to have the time to continue testing this fall, I will post the numbers if I do. All the numbers I posted above are true air speed accounting for winds and using a gps, however the air temp was around 50 most of the time.  I did not post a rate of climb, as I do not trust the VSI on board, it indicates 500-700, but I don't believe it. 	  Quote: 	
		  [b] 	  Quote: 	
		  

      

      Tom McCarthy

           N514 TM  Zenith 601HD 

           N414 TM  Kolb Firestar 

           N863 GB  Kolb Slingshot 

      

	
	


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