Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-11-2013, 20:45   #1
Registered User

Join Date: May 2012
Location: Central California
Boat: Catalina 30
Posts: 873
40 Horse Outboard on Catalina 30?

Is there any reason for not putting a 40 horse
outboard on a Catalina 30?

C30 is 10,200 Lbs with 4,250 Lb ballast.

Weight and trim issues, I can understand.

Any other areas of concern?
__________________

__________________
Bill
...........................................
You can't buy happiness, but you can buy ribeye.
jongleur is offline   Reply With Quote
Old 16-11-2013, 21:20   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Seattle
Boat: Cal 40
Posts: 2,401
Images: 7
Re: 40 Horse Outboard on Catalina 30?

Waste of fuel. Probably takes less than 10 hp to get to hull speed in flat water. If you're thinking you want more hp to power through waves you'll have the problem of the engine more out of the water than in.
__________________

__________________
cal40john is offline   Reply With Quote
Old 16-11-2013, 21:30   #3
Registered User
 
sww914's Avatar

Join Date: May 2009
Location: Punta De Mita
Boat: Vagabond 39 Hull # 1
Posts: 1,842
Re: 40 Horse Outboard on Catalina 30?

It won't go much faster with a 40 than a 15 but if you already have a 40, why not?
__________________
Steve
http://www.landfallvoyages.com
sww914 is offline   Reply With Quote
Old 16-11-2013, 21:35   #4
Registered User

Join Date: May 2012
Location: Central California
Boat: Catalina 30
Posts: 873
Re: 40 Horse Outboard on Catalina 30?

Good answers. Thank you.

I can get a good 40 pretty cheap.

But then what would be optimal for
a C30 outboard?
__________________
Bill
...........................................
You can't buy happiness, but you can buy ribeye.
jongleur is offline   Reply With Quote
Old 16-11-2013, 21:50   #5
Registered User
 
sww914's Avatar

Join Date: May 2009
Location: Punta De Mita
Boat: Vagabond 39 Hull # 1
Posts: 1,842
Re: 40 Horse Outboard on Catalina 30?

Are you from Morro Bay, Bill?

A 40 is pretty hard to lift.

Any way, upon reflection,a 40 is a hell of a lot easier to lift than a Yanmar, isn't it?
__________________
Steve
http://www.landfallvoyages.com
sww914 is offline   Reply With Quote
Old 16-11-2013, 21:53   #6
Registered User

Join Date: Mar 2012
Location: North Carolina
Boat: Seaward 22
Posts: 691
Re: 40 Horse Outboard on Catalina 30?

the c27 i race on has a 9.9 and it works fine.... ever hear of hull speed?
__________________
ohdrinkboy is offline   Reply With Quote
Old 16-11-2013, 23:14   #7
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Seattle
Boat: Cal 40
Posts: 2,401
Images: 7
Re: 40 Horse Outboard on Catalina 30?

Don't know exactly for outboards. Most are designed for high speed, if you get a high thrust version it would probably be close to the values below.

Skene's calcs show about a 20 shp engine for your boat, this includes adding 1/3 more S.H.P. than needed to make hull speed. I used 30% for prop efficiency (outboard probably should use lower eff.).

Rules of thumb vary.

In a different time Hiscock said all you need is 1 hp per ton (long), that's 5 hp for you. This is only good for getting in and out of marinas at less than hull speed. Hiscock thought 3 hp per ton was the biggest engine you would ever need, that's under 15 hp.

For sailboats, Ted Brewer states that "3-4 bhp per ton is adequate, 5 bhp per ton is ample and 6 bhp per ton is often too much."

So about 23 BHP using 5 BHP/ton, assuming he means long tons.
__________________
cal40john is offline   Reply With Quote
Old 16-11-2013, 23:52   #8
Bailing as fast as I can.
 
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 3,585
Re: 40 Horse Outboard on Catalina 30?

Surely having all that weight out on the stern would be a problem? Not so much a trim as a momentum issue.
__________________
GILow is offline   Reply With Quote
Old 17-11-2013, 02:05   #9
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,389
Re: 40 Horse Outboard on Catalina 30?

My concern would be whether or not the transom could support the weight and thrust of an engine that size.
__________________
The water is always bluer on the other side of the ocean.
skipmac is online now   Reply With Quote
Old 17-11-2013, 03:51   #10
Registered User
 
thomm225's Avatar

Join Date: Aug 2011
Location: Hampton Roads
Boat: 1974 Bristol 27
Posts: 3,480
Re: 40 Horse Outboard on Catalina 30?

Many experts recommend 2 hp per 1000lbs, but I have a 5hp (57lbs) on my 6600lb Bristol 27 which does ok. It looks tiny back there which is good. Sailboats look bad enough with an outboard even worse with a large one hanging off the stern.

A 9.9 - 15hp 4 stroke would probably work fine for you, but get the longest shaft you can. I have the extra long 25" 5HP Mercury 4 stroke on my boat. The 9.9hp weighs 85lbs; the 15hp weighs 136lbs.

Btw, these new 4 stroke outboards are as good as a diesel on fuel economy...............
__________________
thomm225 is offline   Reply With Quote
Old 17-11-2013, 10:47   #11
Registered User

Join Date: May 2012
Location: Central California
Boat: Catalina 30
Posts: 873
Re: 40 Horse Outboard on Catalina 30?

Thanks.

Maybe I should buy the 40, sell it and get a
newer 15?
__________________
Bill
...........................................
You can't buy happiness, but you can buy ribeye.
jongleur is offline   Reply With Quote
Old 17-11-2013, 10:59   #12
CF Adviser
Moderator Emeritus
 
Hud3's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,929
Images: 49
Re: 40 Horse Outboard on Catalina 30?

Something to consider is that an outboard will come out of the water in certain windy, choppy conditions, limiting it's ability to push the boat. A friend of mine ended up on a New Jersey beach because of that phenomenom.
__________________
Hud
Hud3 is offline   Reply With Quote
Old 17-11-2013, 11:15   #13
Registered User
 
Cotemar's Avatar

Join Date: Dec 2007
Boat: FP, Helia 44 Evo
Posts: 5,717
Re: 40 Horse Outboard on Catalina 30?

What is wrong with the 10 hp diesel that was inside the Catalina 30?
__________________
Cotemar is offline   Reply With Quote
Old 17-11-2013, 11:19   #14
Registered User
 
Hillbillylad's Avatar

Join Date: Aug 2010
Boat: Westerly Centaur
Posts: 207
Re: 40 Horse Outboard on Catalina 30?

I have a Honda 9.9hp 4 stroke on mine. High thrust long shaft. Uses less than half a gallon an hour. Pushes the boat just fine and haven't had any real issues with cavitation. I guess when those choppy waters are usually wind driven your sails are up right?
Biggest pain for me is no remote controls to the cockpit and I have to lean back over the stern to adjust the throttle or change gear. Not a big issue en route but a pain in the backside maneuvering into slips etc.
I think a15hp might be a better choice for that extra power when needed if it didn't make a massive dent in the fuel consumption or weigh too much.
__________________
Hillbillylad is offline   Reply With Quote
Old 17-11-2013, 11:30   #15
Registered User

Join Date: Sep 2012
Location: Wilbur By The Sea, FL
Boat: Catalina 30
Posts: 660
Re: 40 Horse Outboard on Catalina 30?

Too bad your in California, I would sell you the Honda 9.9 4 stroke off my C 30 real cheap, just come and take it off the transom and I will even throw in the bracket.
__________________

__________________
Gary
http://svknotaclew.wordpress.com/
The Garbone is offline   Reply With Quote
Reply

Tags
catalina, catalina 30, 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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:31.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.