What size motor for a 20ft trailer sailer? - 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 > On Board > Gear & Maintenance
 Not a Member? 


Like Tree2Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 12-20-2011
Junior Member
 
Join Date: Jan 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
CoasterNZ is on a distinguished road
What size motor for a 20ft trailer sailer?

What size motor for a 20ft trailer sailor? Should be a simple question, but maybe not.. The national trailer yacht federation stipulates a minimum of 6 HP, but I'm wondering if I'm out there in the poo one day in 30 knots, whether 8 HP could be wiser?

But a light motor is good as it will get put on and taken off lots, and is easier for everyone to raise and lower on the adjustable transom, which the current 9.9 HP Suzuki isn't. Wondered about 4 strokes - heavier but cleaner, more efficient, quieter (vibration?) 6 HP 4's tend to be single cylinders and haven't heard wide praise for them. The propeller pitch is the other consideration - any simple suggestions?

Last edited by CoasterNZ; 12-21-2011 at 04:05 AM.
Reply With Quote Share with Facebook
  #2  
Old 12-20-2011
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,234
Thanks: 1
Thanked 24 Times in 24 Posts
Rep Power: 6
tommays will become famous soon enough
A 4HP with the high thrust prop is going to be fine because you wont be able to keep and outboard prop in the water if you let the sea state get above point X
__________________
1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #3  
Old 12-20-2011
Senior Member
 
Join Date: Nov 2008
Location: Long Island
Posts: 2,129
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 6
WanderingStar is on a distinguished road
The old formula was 1hp/500lbs. Four horse should be fine. I rowed my 20' keelboat, then used a 45lb thrust trolling motor. Neither method worked into the wind, but then I just sailed.
Yoopers likes this.
Reply With Quote Share with Facebook
  #4  
Old 12-20-2011
BarryL's Avatar
Senior Member
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,595
Thanks: 3
Thanked 25 Times in 24 Posts
Rep Power: 12
BarryL is on a distinguished road
Hello,

when I had a Catalina 22 I used a 4 HP motor and I never wished for more power. The boat weighed about 2000 lbs, so I would say that WanderingStar's formula is correct.

Lastly, a long shaft is more important than more HP from a short shaft. A big motor that comes out of the water in waves / chop won't work as well as a 4HP that is in the water when you need it.

Barry
__________________
Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #5  
Old 12-20-2011
zz4gta's Avatar
I don't discuss my member
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,439
Thanks: 0
Thanked 16 Times in 16 Posts
Rep Power: 8
zz4gta is on a distinguished road
I use 3.5 on a 25' 3000 lbs boat. Works just fine. In a sea way, an outboard ain't gunna move you anyway. Hope there's wind, and sail in.
__________________
Merit 25 # 764 "Audrey"
Reply With Quote Share with Facebook
  #6  
Old 12-20-2011
kwaltersmi's Avatar
Broad Reachin'
 
Join Date: Aug 2006
Location: Grand Rapids, Michigan
Posts: 1,842
Thanks: 1
Thanked 11 Times in 11 Posts
Rep Power: 9
kwaltersmi is on a distinguished road
I agree, 8hp is overkill to be sure. Cavitation becomes a real issue when things get snotty and you have to motor. Better to avoid the snot or learn to sail in it.
__________________
Catalina 34

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #7  
Old 12-20-2011
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,165
Thanks: 1
Thanked 33 Times in 33 Posts
Rep Power: 4
MarkSF is on a distinguished road
Quote:
Originally Posted by CoasterNZ View Post
What size motor for a 20ft trailer sailor? Should be a simple question, but maybe not.. The national trailer yacht federation stipulates a minimum of 6 HP, but I'm wondering if I'm out there in the poo one day in 30 knots, whether 8 HP could be wiser?

But a light motor is good as it will get put on and taken off lots, and is easier for everyone to raise and lower on the adjustable transom, which the current 9.9 HP Suzuki isn't. Wondered about 4 strokes - heavier but cleaner, more efficient, quieter (vibration?) 6 HP 4's tend to be single cylinders and haven't heard wide praise for them. The propeller pitch is the other consideration - and simple suggestions?
I had a Tohatsu 3.5hp 4 stroke on my trailer sailer and it was a great little motor. Sipped fuel, reliable starter, good power. I'm sorry I sold it, it was way better than the Suzuki 2.5 I have on my inflatable dinghy now.

I never noticed much problem with vibration. I tended to lock it dead ahead and steer with the tiller, so I was never holding onto it for long.

As we are likely to see more bodies of water closed to 2 strokes, I think getting a 4 stroke makes sense if you're not too sensitive to weight. 10 or 20 extra lbs isn't going to bother you as much as it would with an inflatable dinghy.

I bought the Tohatsu as, at 43 lbs, it was a good tradeoff, power vs. weight.
Yoopers likes this.
__________________
1984 Bristol 31.1
Alameda, California, USA
Reply With Quote Share with Facebook
  #8  
Old 12-20-2011
bjslife's Avatar
1973 Morgan O/I 33
 
Join Date: Oct 2009
Location: Charleston, Oregon
Posts: 72
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
bjslife is on a distinguished road
I had a 9.9 Johnson long shaft on my 1969 Venture(mcgregor) 24' and never worried about tide or current. It was easy to lift also.

Last edited by bjslife; 12-21-2011 at 10:58 PM.
Reply With Quote Share with Facebook
  #9  
Old 12-21-2011
Junior Member
 
Join Date: Jan 2011
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
CoasterNZ is on a distinguished road
Thanks for that - good advice. I'll stick to long shaft.

High thrust - can anyone give me an idea of the dimensions and range of pitch ratio I should look for in a prop?
Reply With Quote Share with Facebook
  #10  
Old 12-21-2011
Junior Member
 
Join Date: Jul 2007
Posts: 27
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
danr620 is on a distinguished road
motor

Coaster,

I have 4 hp mariner on my 21 ft, weighs 1400 lbs and rarely need much throttle. I don't sail in the sea, but can't imagine it wouldn't be enough if prop stayed in water.

good luck

Dan
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
Outboard size for 20ft sailboat mceveritt Gear & Maintenance 11 02-29-2012 11:53 PM
14'' cal trailer sailer mick b General Discussion (sailing related) 2 11-13-2011 06:15 PM
Looking for a trailer sailer kruucks Boat Review and Purchase Forum 10 09-30-2008 08:39 AM
A new trailer sailer Giulietta General Discussion (sailing related) 33 05-27-2008 03:46 PM
looking for a trailer sailer hillbillybear Boat Review and Purchase Forum 28 03-27-2008 11:57 AM


All times are GMT -4. The time now is 01:50 AM.

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.