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Sling Shot engine shims

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Tue Oct 26, 2010 11:06 am Post subject: Sling Shot engine shims

Thom, Ted, all, I went out to the hangar and measured up the Mk III and Firestar engine mounts to get some input for Autocad. I measure both at 9.5" between bolt centers fore to aft. Since I have to have a little material to hang on to while fly cutting the face of the shims I set thickness of the forward edge of the front shim at .125". Using Ted's suggestion that .875" (7/8") is the best height to correct the thrust line, I put the aft edge of the aft shim at 1.00". Connect the two lines and measure the angle and out pops 4 degrees on the button. Thom, based on your measure that your thrust line is currently 3.5 degrees up, shims based on these numbers would put your thrust line down (converging with the bottom of the wing by .5 degrees. 



Rick

-- 

Zulu Delta

Kolb Mk IIIC

582 Gray head

4.00 C gearbox

3 blade WD

Thanks, Homer GBYM

It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.

  - G.K. Chesterton



 

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Wed Oct 27, 2010 5:14 am Post subject: Re: Sling Shot engine shims

Rick,



I didn't read your post until I read Ted's most recent post so now I know the ANGLE of Ted's Slingshot thrust line. It surprises me that it is not closer to the angle of the horizontal stabilizer. 



Thanks for doing my job for me. Did you happen to take the measurements of the size of the mount pads? If not, you needn't bother as I will be going to the hangar Thursday and measure those as well. It is possible, but not likely,  that the pads are a different size on the Slingshot than on your MkIII. Once I confirm the pad size I'll let you know.



Thanks again for everyone's help on this.

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Thom Riddle
Buffalo, NY (9G0)

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed Oct 27, 2010 10:01 am Post subject: Sling Shot engine shims

Thom, The pads are a bit over 2.5" fore to aft. The distance between mounting holes is 1.75" (taken from a spare mount). I can get 2 1/2" wide bar stock at a local supplier in both 1" and 1/4" thick. The smaller size for the front wil I figure I'll put a 1.375 hole in the middle of the shims just to take a little weight out of them. I picked the size only because I have a cut down drill of that size that has the shank ground to 3/4" so I can run it right out of a collet and it is short enough that I don't have to get all aerobic cranking the table up and down. I went back and dimensioned the drawing so you can compare to your mount just to be sure. Turns out I had the accuracy turned down a bit to much on angular measurements when I said it is spot on at 4 degrees, but I doubt that little extra will make a big difference.

 



Rick



On Wed, Oct 27, 2010 at 8:14 AM, Thom Riddle <riddletr(at)gmail.com (riddletr(at)gmail.com)> wrote:

 	  Quote: 	
		   --> Kolb-List message posted by: "Thom Riddle" <riddletr(at)gmail.com (riddletr(at)gmail.com)>

 

 Rick,

 

 I didn't read your post until I read Ted's most recent post so now I know the ANGLE of Ted's Slingshot thrust line. It surprises me that it is not closer to the angle of the horizontal stabilizer.

 

 Thanks for doing my job for me. Did you happen to take the measurements of the size of the mount pads? If not, you needn't bother as I will be going to the hangar Thursday and measure those as well. It is possible, but not likely,  that the pads are a different size on the Slingshot than on your MkIII. Once I confirm the pad size I'll let you know.

  

 Thanks again for everyone's help on this.

 

 --------

 Thom Riddle

 Buffalo, NY (9G0)

 Kolb Slingshot SS-021

 Jabiru 2200A #1574

 Tennessee Prop 64x32

 

 

 “Everyone is entitled to his own opinion, but not his own facts.”

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-- 

Zulu Delta

Kolb Mk IIIC

582 Gray head

4.00 C gearbox

3 blade WD

Thanks, Homer GBYM

It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.

  - G.K. Chesterton

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Wed Oct 27, 2010 10:19 am Post subject: Re: Sling Shot engine shims

Thanks again, Rick. 



Assuming my motor mount is identical to the one you measured, that should work fine the way you described it. Let me make sure tomorrow that my motor mount is the same and I'll give you the go ahead.



I really appreciate your help with this.

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Thom Riddle
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Fred Kerfoot

Joined: 11 Jan 2006
Posts: 14
Location: Tampa, FL

Posted: Fri Nov 05, 2010 4:44 am Post subject: Sling Shot engine shims

Rick, don't forget to make 4 thin beveled shims for the under side of the engine mounts. (6 thin & 2 thick total).  

 Otherwise you will be bending the bolts.



                  FredK 

   Thom, The pads are a bit over 2.5" fore to aft. The distance between mounting holes is 1.75" (taken from a spare mount). I can get 2 1/2" wide bar stock at a local supplier in both 1" and 1/4" thick. The smaller size for the front wil I figure I'll put a 1.375 hole in the middle of the shims just to take a little weight out of them. I picked the size only because I have a cut down drill of that size that has the shank ground to 3/4" so I can run it right out of a collet and it is short enough that I don't have to get all aerobic cranking the table up and down. I went back and dimensioned the drawing so you can compare to your mount just to be sure. Turns out I had the accuracy turned down a bit to much on angular measurements when I said it is spot on at 4 degrees, but I doubt that little extra will make a big difference.

 



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