The problem that I see with this calculator is that there is no value for prop diameter (and slip is pretty intangible, though I suspect using .10 slip might be a good approximation for 90% efficiency).
The rule of thumb that a local propshop told me is that changing prop diameter by 1” is approximately equivalent to changing the prop pitch by 2”. So diameter also enters into the calculation. I believe each prop maker has their own calculator for recommending initial diameter and pitch, based on boat weight, engine HP and targeted cruising RPM, transmission reduction ratio, and hull speed. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of svpegasus38 via CnC-List Sent: Sunday, December 17, 2017 5:56 PM To: cnc-list@cnc-list.com Cc: svpegasus38 <svpegasu...@gmail.com> Subject: Re: Stus-List PROPELLER PITCH Try this propellor calculator. rbbi.com/folders/prop/propcalc.htm Sent from my T-Mobile 4G LTE Device Doug Mountjoy POYC Rebecca Leah Lf39 -------- Original message -------- From: Bunky via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Date: 12/17/17 14:18 (GMT-08:00) To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> Cc: Bunky <richard.h.bernst...@uvm.edu <mailto:richard.h.bernst...@uvm.edu> > Subject: Stus-List PROPELLER PITCH Luna is a 1984 C&C 35 with a Yanmar 3gm30 engine. Does anyone know what the proper propeller pitch should be? She has an aftermarket Maxiprop, and based on engine performance, I believe the pitch may be set too high. Richard Luna, Lake Champlain, VT _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
