[C320-list] C320 Prop Question

[Warren Updike]

Normally, when you move from a 2 blade to 3 blade prop the diameter is
reduced not increased.  I suggest you contact Catalina with the engine model
and transmission ratio information.  They will tell you the proper sized
3-blade prop for your boat.  
If you are over propped at 3/15, you might also find you cannot reach max
rpm for that engine.  As you are "in the process" I hope you get the current
owner to correct this before you buy.
Welcome to the wonderful world of C320.  You'll find this list and the web
site to be invaluable references.

Warren & Pattie Updike
1994 C320 #62 "Warr De Mar"



-----Original Message-----
From: Frank Reid [mailto:freid59 at verizon.net] 
Sent: Monday, August 13, 2012 9:34 AM
To: C320-list at catalina320.com
Subject: [C320-list] C320 Prop Question

I'm in the process of buying a Catalina 320 and the current owner changed
the prop from the 2 blade 13 inch (measured tip to tip) with a 3 blade 15
inch.  During our sea trial while under high RPM the engine was expelling
unused fuel out the exhaust.  If we place the transmission in neutral and
rev'd it up there was no fuel expelling.  I suspect the prop is the wrong
size.  It has the 30F engine.  Does anyone know for sure what size 3 blade
prop is correct?