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Prop Bolt Patterns

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lrm(at)skyhawg.com
Guest

Posted: Wed Dec 26, 2007 8:38 am Post subject: Prop Bolt Patterns

The bolt pattern for my new PRSU measures out to be 100mm with 6  3/8" bolts.  That is supposed to be the large Rotax, right?  Now I am  confused because I called Powerfin about a new prop.  They said "no it's a  4" or 101,6mm pattern".  Well, I can read a caliber unless it's Miller  time.  I have four calipers, they all lie at times.  So I argued with  the guy.  He almost convinced me my PRSU was drilled wrong.  He wasn't  that convincing because I didn't buy a prop, yet.  I had an old spacer  plate for an SAE-1.  Just for fun, I put it in the end mill and drilled a  4" pattern in between the 4 3/8" pattern.  Took it over to the PRSU and of  course it was too big by about 1.6mm.  I knew it would be, but seeing  is believing, plus it was scrap anyway. 

I am still confused, Culver says it a large 100mm Rotax.  Powerfin says they would have to drill a special prop hub for me  because the large Rotax is 4".  Are there two large Rotax patterns?   It wouldn't surprise me.  Everybody knows more about this stuff than I do,  so someone please straighten me out.  Does anyone know where I can find a  chart of all the different small bolt patterns for our type of  engines? 

Building cars was less confusing and a whole lot  cheaper. 

LRM, www.skyhawg.com    

   

  

  

  

    [quote][b]

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Mainwheels

Joined: 29 Oct 2007
Posts: 5

Posted: Wed Dec 26, 2007 10:18 am Post subject: Prop Bolt Patterns

Hi;

The "old" 912s had the 100mm bolt circle. New 912s have a 4 inch or 

101.6 dia bolt circle. The bolts are still 8 mm.

Mike

CH601HDS 1200+ hrs

UHS Spinners



LRM wrote:

 	  Quote: 	
		   The bolt pattern for my new PRSU measures out to be 100mm with 6 3/8" 

 bolts.  That is supposed to be the large Rotax, right?  Now I am 

 confused because I called Powerfin about a new prop.  They said "no it's 

 a 4" or 101,6mm pattern".  Well, I can read a caliber unless it's Miller 

 time.  I have four calipers, they all lie at times.  So I argued with 

 the guy.  He almost convinced me my PRSU was drilled wrong.  He wasn't 

 that convincing because I didn't buy a prop, yet.  I had an old spacer 

 plate for an SAE-1.  Just for fun, I put it in the end mill and drilled 

 a 4" pattern in between the 4 3/8" pattern.  Took it over to the PRSU 

 and of course it was too big by about 1.6mm.  I knew it would be, but 

 seeing is believing, plus it was scrap anyway.

 

 I am still confused, Culver says it a large 100mm Rotax. Powerfin says 

 they would have to drill a special prop hub for me because the large 

 Rotax is 4".  Are there two large Rotax patterns?  It wouldn't surprise 

 me.  Everybody knows more about this stuff than I do, so someone please 

 straighten me out.  Does anyone know where I can find a chart of all the 

 different small bolt patterns for our type of engines?

 

 Building cars was less confusing and a whole lot cheaper.

 

 LRM, www.skyhawg.com <http://www.skyhawg.com>

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lrm(at)skyhawg.com
Guest

Posted: Wed Dec 26, 2007 6:52 pm Post subject: Prop Bolt Patterns

This PRSU has 12 holes.  It appears that I have been measuring the same two 

holes every time and I must have done it at least ten times.    I happened 

to measure again today and low and behold this set of holes was not the same 

as the other ten sets.  They were 4".   What a deal.  You sure can't tell 

the difference just by looking. The old boy that built it was smarter than I 

gave him credit for, he drilled for both sets.  Since I didn't buy it 

directly from the him, I didn't know.   But I did wonder why he put 12 holes 

in it.  Take care, LRM.

---

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