Like Tree0Likes

Prop rotation

Reply
Old 12-06-2011, 02:08 AM
  #1
Registered
Thread Starter
 
Join Date: Dec 2011
Posts: 2
Default Prop rotation

I'm new to offshore only, this will be my first post so go easy on me... I just bought a 1990 IMP and noticed that the props rotate outward. I was lead to believe that for performance boats the rotation should be to the center of the boat. does it make any difference? Any help would be great.
31imp is offline  
Reply With Quote
Old 12-06-2011, 02:21 AM
  #2
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,741
Default

Probably 80-90% of boats spin the props outward. Spinning them in gives more bow lift and sometimes a couple mph's on the top end. Spinning in can reduce handling and make docking harder.
Griff is offline  
Reply With Quote
Old 12-06-2011, 01:25 PM
  #3
Registered
 
Join Date: Apr 2009
Location: Denmark and hopefully some place nice
My Boats: 42' Sundancer from 2004 formerly known as Big azz cruiser from 2004. Still looking for the right new 38-42 ft. v-bottom!
Posts: 1,852
Default

Quote:
Originally Posted by 31imp View Post
I'm new to offshore only, this will be my first post so go easy on me... I just bought a 1990 IMP and noticed that the props rotate outward. I was lead to believe that for performance boats the rotation should be to the center of the boat. does it make any difference? Any help would be great.
Welcome to OSO, we're always open

Well. it sort of depends on your setup. Toe in/out of the drives, drive height, prop it self ect.

I'd suggest you swap them around and see what happens. If you find spinning in better to your liking, switch the shifter cables in the controls, so you won't have to go "in reverse" so to speak to go forward.

Congrats on the boat.

Any pics for us.
A.O. Razor is offline  
Reply With Quote
Old 12-06-2011, 07:32 PM
  #4
Registered
 
Join Date: Sep 2008
Location: LOTO
Posts: 1,200
Default

I'd leave it alone.
redbud35 is offline  
Reply With Quote
Old 12-06-2011, 10:42 PM
  #5
Enjoy the show
VIP Member
 
Ron P's Avatar
 
Join Date: Feb 2001
Location: The Joisey Shore
Posts: 10,353
Default

Agreed, leave it alone. Spinning in will make handling weird and backing up useless. All to gain MAYBE one MPH.

You should measure your drives to make sure they are in line. Measure on nose and center of prop shaft. Some people say they should be toed in a 1/4 inch.

Welcome to OSO.
Ron P is offline  
Reply With Quote
Old 12-06-2011, 10:58 PM
  #6
PF Marine
Platinum Member
 
Coolerman's Avatar
 
Join Date: Mar 2003
Location: Dallas, TX
Posts: 1,767
Default

Handling and speed is dependant on the design of your hull.

Docking is always worse spinning in regardless of your hull.

For an IMP, I would suggest spinning them out.
Coolerman is offline  
Reply With Quote
Reply



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 08:08 PM.


Copyright 2011 OffShoreOnly. All rights reserved.