Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 29-03-2010, 07:18   #1
Registered User

Join Date: Aug 2008
Location: San Francisco Bay Area
Boat: 1970 Newport 30
Posts: 14
What Size Outboard for Newport 30

Hi there everybody,

I have a 30' Newport whose engine Atomic 4 i just found out is going to have to be pulled out and rebuilt, but there is no way i have the money to do the job right now...maybe at the end of the year. But what I can afford is a reasonably priced outboard to hold me off and actually let me get the boat out this season. I know i want something in the 10-15 horsepower range (I'm leaning more towards 15) but I am wondering if there are any other specs I need to know about choosing the right outboard? I don't know about shaft length or prop?? The boat has a small lowering outboard rack where there used to sit a little 9.5HP. Could I possibly mount a 15 on it? and would it have to be a longshaft? Does any one know any good articles on proper measurement and sizing for outboards for sailboats?
Any advice or information is greatly appreciated.

Thanks a bunch to all for looking,

Amigo is offline   Reply With Quote
Old 29-03-2010, 07:47   #2
Registered User

Join Date: Feb 2009
Location: Jacksonville, FL
Boat: Newport 28 MKII
Posts: 359
You will want a longshaft outboard. If the current mount was rated for a 9.5 hp, do a search and find out the weight of the 9.5 and compare it to the 15hp weight you are considering. Due to the length of the boat, don't be surprised if the o/b prop comes out of the water and cavitates in anything but the calmest water. I suspect a 15hp two stroke will weigh about the same as a 9.5 two stroke. Soem of those articulating mouts can be flimsy, so make sure the weights and rating is right.

Steve W is offline   Reply With Quote
Old 29-03-2010, 14:37   #3
Registered User

Join Date: Jan 2010
Location: Gloucester, MA
Boat: CS 36t
Posts: 387
What do you want the outboard to do for you? Is it only for powering in light airs or is it for docking or dealing with high winds? If you only wanted a way to get back to a mooring in really light air with no current, 5hp would probably be enough but if you want to push into 30 knots of wind and 4' chop, you would need way more.

As Steve W said, you will need a longshaft. I would also recommend looking at a different propeller which is better matched to the application.
klem is offline   Reply With Quote
Old 29-03-2010, 15:08   #4
Registered User
Solitude's Avatar

Join Date: Nov 2008
Location: West Coast, BC , Canada
Boat: Cascade
Posts: 595
I agree with the above and would like to add a rule of thumb that I was once told.

1 HP for every 500lbs displacement when sizing an inboard diesel.
Go outside and PLAY!
Solitude is offline   Reply With Quote
Old 29-03-2010, 15:34   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41 Ohana
Posts: 3,633
Images: 9
Luckily you live in SF Bay where the engine is not used very much. I would take in to consideration what your docking procedure is. If you dock in a downwind berth in Emeryville that is going to require a good horsepower to stop you. If you are in a quiet berth in Sausilito 15 should be fine. The Atomic 4 had 30 hp.
Fair Winds,


Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
Charlie is offline   Reply With Quote

newport vessels, outboard

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
outboard size for older Achilles 9ft HB inflatable? witzgall Engines and Propulsion Systems 9 12-12-2008 09:32
Mercury outboard book? Or just outboard? Jack Long The Library 2 17-09-2008 08:33
Recommended Outboard size? navillusdm Engines and Propulsion Systems 9 05-09-2008 12:19
What size outboard motor? bob and sharon Auxiliary Equipment & Dinghy 1 30-04-2008 23:24
Can someone help me?? Newport, RI pbeale24 General Sailing Forum 0 24-06-2004 09:13

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 12:02.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.