Reply
 
Thread Tools Search this Thread
 
Old 06 January 2011, 17:36   #21
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,021
I think they call that stalking! And it was bolted on fine, the bit that was bolted on was the only bit left
__________________

__________________
martini is offline   Reply With Quote
Old 07 January 2011, 04:17   #22
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by martini View Post
Another thought just occurred to me, yes bit quiet at work today

Pitch is the displacement of the prop, ie a 21" pitch prop would move forward a theoretical 21" through a solid mass (no slip).

Therefore any DIAMETER prop of a certain pitch would be comparable to another of equal pitch, they'll both move through a solid mass the same distance per revolution. Obviously discounting all the other variables, surface area, cupping, etc.

Or am I talking sh*t again?
Yes! Reducing diameter increases RPM but the ration is variable depending on other factors almost too many to mention!

We have had quite a bit of prop work done for racing over the years and it is a black art - I can guarantee that Steel Developments have more experience than all of us put together, give them the the information and let them recomend the prop for you to fit.

For instance do you know if more bow lift would help? Sometimes a change in model of prop with different characteristics can give you 500 rpm .... but it might make it harder to control in rougher conditions
__________________

__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 10:06.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.