Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-05-2019, 09:42 AM   #1
Veteran Member
 
newbernbuck's Avatar
 
City: New Bern, NC
Country: United States
Vessel Name: HALLIN
Vessel Model: Mainship 34 MK1 1982
Join Date: Feb 2016
Posts: 56
Mainship 34 prop size with 200hp Perkins

Wondering if anyone out there that has or had an older Mainship 34 with the 200hp Perkins what prop size they were using. Mine appears to be a 22X24.
I'm wondering if I might be a bit over propped as WOT is around 2150 rpm and it will tend to overheat at that rpm. Heat exchangers have all been cleaned and pumps checked. Normally run boat at 1500-1800 rpms with no issues. Also I'm considering fairing the back of the keel while hauled out this winter.
Thanks everyone. FYI also this posted on yahoo vintage mainship
__________________
Advertisement

newbernbuck is offline   Reply With Quote
Old 01-05-2019, 10:05 AM   #2
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 3,216
When I faired my Mainship 1 keel I gained about 100-150 rpm.
If you look at the "registry" on that Mainship owner's site you'll be able to see what other boats have for props.
Here's a pic of what mine looked like. I used 2 pieces of pressure treated 4x4 as a base.
Attached Thumbnails
Click image for larger version

Name:	fairing.jpg
Views:	29
Size:	163.5 KB
ID:	83904  
__________________

__________________
Jay Leonard
Attitude Adjustment
40 Albin
Mystic,Ct. /New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 01-05-2019, 12:04 PM   #3
Guru
 
boomerang's Avatar
 
City: Kilmarnock VA
Country: united states
Vessel Name: YellowBird MMSI 367769170
Vessel Model: 1978 Mainship m1 #149
Join Date: Apr 2016
Posts: 509
Our calibrated tachs, and by calibrated I mean I adjusted with an ebay $15 laser tach which might or might not be accurate, both show 2550 WOT when the bottom is clean but we have a 160 Perkins turning a 20x20 no cup 3-blade wheel through a 2.10-1 clutch. It was the same when we had a 4-blade too. The leading edge of our keel isn't faired, btw.
__________________
-Shawn-

https://shawnandlizboats.blogspot.com/
boomerang is offline   Reply With Quote
Old 01-05-2019, 12:09 PM   #4
Guru
 
boomerang's Avatar
 
City: Kilmarnock VA
Country: united states
Vessel Name: YellowBird MMSI 367769170
Vessel Model: 1978 Mainship m1 #149
Join Date: Apr 2016
Posts: 509
Sidebar thread drift but Jay, get ready for me to reach out to you & request your input/wisdom regarding a model 1 repower. We've FINALLY neared the restoration of our 34 & I'm seriously contemplating repowering vs updating our Perkins.
__________________
-Shawn-

https://shawnandlizboats.blogspot.com/
boomerang is offline   Reply With Quote
Old 01-05-2019, 12:32 PM   #5
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 3,216
Quote:
Originally Posted by boomerang View Post
Our calibrated tachs, and by calibrated I mean I adjusted with an ebay $15 laser tach which might or might not be accurate, both show 2550 WOT when the bottom is clean but we have a 160 Perkins turning a 20x20 no cup 3-blade wheel through a 2.10-1 clutch. It was the same when we had a 4-blade too. The leading edge of our keel isn't faired, btw.
4 blade 20x20 was standard on those Perk 160 powered boats. Mine went from 2550 to almost 2700 when I added the fairing blocks.
__________________
Jay Leonard
Attitude Adjustment
40 Albin
Mystic,Ct. /New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 01-05-2019, 12:34 PM   #6
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 3,216
Quote:
Originally Posted by boomerang View Post
Sidebar thread drift but Jay, get ready for me to reach out to you & request your input/wisdom regarding a model 1 repower. We've FINALLY neared the restoration of our 34 & I'm seriously contemplating repowering vs updating our Perkins.
A Cummins 210 or 270 is perfect power for those boats. If you can find a Cummins re-man in either that would be the economical way to go.
__________________

__________________
Jay Leonard
Attitude Adjustment
40 Albin
Mystic,Ct. /New Port Richey,Fl
jleonard is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





All times are GMT -5. The time now is 05:50 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012