Prop Size Bahama 30 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > Boat Builders Row > Islander
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 10-18-2008
Member
 
Join Date: Aug 2008
Location: Sidney, British Columbia
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
bvermeer is on a distinguished road
Prop Size Bahama 30

Anyone have the size (12 x ?? LH) for a two bladed prop on a 1978 Islander Bahama 30 with the original Volvo MD7A 13hp diesel engine? Mine had an oversized three bladed prop when I got it. I replaced it with a Campbell Sailor two bladed but I'm not happy with the lack of speed under power (maybe 5 knots on a flat surface). I've had this prop re-pitched a number of time but can't come up with a happy medium, too much cativation when it gets pitched too much. I'm thinking of going back to the standard two blade but don't have the pitch.
Reply With Quote Share with Facebook
  #2  
Old 10-29-2008
Junior Member
 
Join Date: Oct 2007
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
RLBrown is on a distinguished road
The 2-blade fixed prop on our 1980 Bahama 30 (with Volvo MD7A) is 12" x 14" x 3/4" LH. The boat powers pretty well, about 6 kts. in flat seas.
Reply With Quote Share with Facebook
  #3  
Old 10-29-2008
Member
 
Join Date: Aug 2008
Location: Sidney, British Columbia
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
bvermeer is on a distinguished road
Prop Size

Thank you! I've never been able to reach 6 knots, even down hill, under power. What RPM have you got the MD7A running at to get that speed?

Last edited by bvermeer; 10-29-2008 at 02:29 PM. Reason: mis spelled word
Reply With Quote Share with Facebook
  #4  
Old 10-30-2008
Junior Member
 
Join Date: Oct 2007
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
RLBrown is on a distinguished road
We get 6 knots at 2300-2400 RPM max. With only 13 HP, any headwind or seas will slow us down pretty quickly. Also, keeping the bottom clean seems to make a big difference in powering speed - a couple weeks of growth makes a noticeable difference.
Reply With Quote Share with Facebook
  #5  
Old 10-30-2008
Member
 
Join Date: Aug 2008
Location: Sidney, British Columbia
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
bvermeer is on a distinguished road
Prop Size

Thanks. I'm on the hunt for a replacement. That's the general RPM I cruise at and I've been lucky to get to five knots on flat water. Time for a change.
Reply With Quote Share with Facebook
  #6  
Old 10-31-2008
Senior Member
 
Join Date: Feb 2008
Location: N. VA
Posts: 656
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
dacap06 is on a distinguished road
Send a message via Yahoo to dacap06
Differences in Bahama 30 Props for different years

Now that's interesting. I bought a 1984 Islander Bahama 30 a month ago and there less in common here than I would have expected. It has a 15 HP Yanmar 2GMF with a 2 blade 13 x 10 right-hand prop on a 3/4" shaft. I wonder when they changed?
Reply With Quote Share with Facebook
  #7  
Old 10-31-2008
Member
 
Join Date: Aug 2008
Location: Sidney, British Columbia
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
bvermeer is on a distinguished road
Prop size

Interesting. I suspect that the original engine has been replaced with the Yanmar. I've seen that happen more than once. I'm just surprised that they would have retained the 3/4" shaft. Most opt for the standard 1", having to replace the strut and stuffing box. Most mechanics suggest that the 1" shaft is need to handle the extra torque of the 18 hp. But then, I've never seen a shaft bent due to the extra hp of a new engine. I've actually thought of going to a saildrive when I replace the old MD7A. It'll be easier to install and reduce the vibration at the same time. We'll see....
Reply With Quote Share with Facebook
  #8  
Old 01-13-2009
Member
 
Join Date: Jul 2005
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
kentg is on a distinguished road
Bert,
have not been lurking here for a while, lots going on. We traded thoughts on hard starting MD7A's a while back. You probably already know, if the compression is not up to snuff, you will not get the HP no matter what size prop. I adjusted my valves a year ago, and don't think I get the same speed as before, so I think they might be a little sloppy. I might have a real mechanic redo them, but I think the rings are probably the problem.

Unfortunately our old beasts are just getting tired!

Kent
B30 Jazzed
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Prop size? mwrohde Gear & Maintenance 7 05-29-2007 05:52 PM
Good Prop Size for Express 30 wstewart Announcements and Suggestions Box 1 02-10-2007 01:38 PM
Choosing the Right Propeller Sue & Larry Gear and Maintenance Articles 0 02-04-2003 07:00 PM
what size prop?? stevfran Gear & Maintenance 1 01-30-2003 07:16 PM
Proper Prop size for Cat 30 gfeier Gear & Maintenance 0 08-20-2001 04:52 AM


All times are GMT -4. The time now is 10:57 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.