[C320-list] Perkins Rotation

[McCullough, Kirk]

Warren

In fact the gearbox does reverse the rotation in forward gear. CW at the
front of the engine becomes CCW viewed at the flywheel which becomes CW
at the prop, which is RH.

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 Steve Magennis
Sent: Monday, March 20, 2006 5:17 AM
To: C320-List
Subject: Re: [C320-list] Perkins Rotation

Warren:

A left hand rotation observed from the front is a right hand rotation
viewed from the propeller end.  There is no change in the direction of
rotation in your engine / transmission.  Getr a right hand rotating
prop.

Steve
Alchemist C-320

--- Warren Updike <wupdike at hotmail.com> wrote:

> 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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