[C320-list] Perkins Rotation

[McCullough, Kirk]

Thanks Warren, your input matches what I have found from other sources
too. 

Kirk L. McCullough
Analytical Sales Mgr 
 

-----Original Message-----
From: C320-List-bounces at catalina320.com
[mailto:C320-List-bounces at catalina320.com] On Behalf Of Warren Updike
Sent: Saturday, March 18, 2006 8:09 AM
To: Catalina 320 Mail List
Subject: Re: [C320-list] Perkins Rotation

The name plate on my Hurth:
  MODEL    HBW 50

  RATIO     iA =2.05         iB =1.86

  SER. N.    09-73295

The manual I have says that the "A" ratio is "Transmission ratio
propeller rotation opposite engine rotation."  And, the "B" ration is
"Transmission ratio propeller rotation same to a engine rotation."
(Exact quote.)

I read the ration as A=2.05:1, to mean that the shaft makes 1 turn to
each 2.05 turns of the engine crankshaft.  If the "A" ratio is, in fact,
the forward speed, then, indeed the trans does reverse the engine
rotation in forward.  Why the reverse, "B" ratio, would be lower than
the forward ratio, I can only conjecture.  Certainly, with cars the
situation would be reversed, I think.  Perhaps someone with better
understanding may enlighten us.

Warren & Pattie Updike
C320, #62, 1994, "Warr De Mar"
Frog Mortar Creek, Middle River
Chesapeake Bay
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