Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 23-04-2008, 13:34   #1
Registered User
 
Latitude9.5's Avatar

Join Date: Jun 2006
Boat: CAL 3-46
Posts: 441
Send a message via AIM to Latitude9.5
Prop-nut Question

OK so here's the deal, we put the new prop on today, after the prop is a spacer (this is due to extra shaft length for the old feathering prop) anyhow, the hub is a little bigger so I either need to have the spacer shortened OR there are two nuts on the prop the large nut and the jam nut, would there be any issue using two smaller nuts instead of one large one small? Of course cotter pin goes on after that.
__________________

__________________
Latitude9.5 is offline   Reply With Quote
Old 23-04-2008, 13:38   #2
GreatKetch
Guest

Posts: n/a
At least you didn't ask which nut goes on first the big one or the little one. That ALWAYS starts a fight.

Two thin jam nuts are certainly not standard practice. Maybe someone can do detailed thread loading calculations to tell you you would be ok with it, but why take the chance?

Boat design is a history of tweaking things until they break, then backing off. You really don't want to voluteer to be the guniea pig here do you?
__________________

__________________
  Reply With Quote
Old 23-04-2008, 13:42   #3
Registered User
 
Latitude9.5's Avatar

Join Date: Jun 2006
Boat: CAL 3-46
Posts: 441
Send a message via AIM to Latitude9.5
Yea well the issue is this, to use the spare prop, I need the current spacer, which is a stainless spacer, if I shorten the spacer, it will only work on one prop, basically I need to get a new spacer. However, if it's a risk obviously I don't want to do it, I'll just have to have a shorter spacer made. we can actually see the cotter key hole just peaking out, so it's maybe a 1/16th of an inch that I need to get the cotter key in.
__________________
Latitude9.5 is offline   Reply With Quote
Old 23-04-2008, 13:46   #4
Registered User
 
Latitude9.5's Avatar

Join Date: Jun 2006
Boat: CAL 3-46
Posts: 441
Send a message via AIM to Latitude9.5
Of course i could just go with a slotted nut that the cotter key would go through.
__________________
Latitude9.5 is offline   Reply With Quote
Old 23-04-2008, 19:49   #5
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Quote:
Originally Posted by GreatKetch View Post
Two thin jam nuts are certainly not standard practice. Maybe someone can do detailed thread loading calculations to tell you you would be ok with it, but why take the chance?
I would be very, VERY surprised if using two thin nuts ever presented any kind of problem. Seriously, what could happen?
__________________
fstbttms is offline   Reply With Quote
Old 23-04-2008, 19:53   #6
Registered User
 
Latitude9.5's Avatar

Join Date: Jun 2006
Boat: CAL 3-46
Posts: 441
Send a message via AIM to Latitude9.5
I called the prop shop asked them about running a castle nut or a second thinner nut, they didn't think it would be an issue, so i dunno, I think the castle nut will easily fit and not give up any strength.
__________________
Latitude9.5 is offline   Reply With Quote
Old 24-04-2008, 15:57   #7
Registered User
 
Latitude9.5's Avatar

Join Date: Jun 2006
Boat: CAL 3-46
Posts: 441
Send a message via AIM to Latitude9.5
ok i ended up with a jam nut that has about 25% more sidewall too it (it's beafier) stainless steal and a castle nut, again bigger nut (outer diameter, not inner) then the original nuts....... i think i'll be ok LOL
__________________

__________________
Latitude9.5 is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Antifouling a Prop Wotname Propellers & Drive Systems 174 19-05-2012 05:22
Prop Walk irwinsailor Monohull Sailboats 27 04-02-2010 23:37
37 Gulfstar Prop svsamira Construction, Maintenance & Refit 0 06-08-2007 15:07
Which prop CARL Monohull Sailboats 11 17-09-2006 01:30
What Prop? Moby Dick Multihull Sailboats 27 28-07-2006 13:45



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:51.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.