What size engine for 27ft sailboat?

[Talisman]

I have an old Mariner 15hp engine (long shaft) that is on its last leg. If I replace it, what size would anyone suggest? The boat weighs approx. 5,000# and the 15 hp seems sufficient. It is a displacement-type hull and, tehrefore, limited to about 6/7 knots. The 15 seems to reach max hull speed at about 75% power. Anything more just increases the noise and fuel flow.

 

[Rex_Wahl]

Re: What size engine for 27ft sailboat?

The book Propeller Handbook, by Dave Gerr 1989. International Marine Publishing Co. Camden, Maine. Is great for these questions. Covers needed power for hull and prop pitch and size.

 

[SAIL4EVER]

Re: What size engine for 27ft sailboat?

I have seen two Catalina 25's powered by 10hp outboards. I had a 5hp Honda and found it to have more thrust than other 5hp's so I would recommend Honda's 10 hp.

 

[Boatist]

Re: What size engine for 27ft sailboat?

I agree 9.9 to 15 HP but make sure you get the high thrust model. Johnson and Evinrude made a nice 9.9 for this application. The high thrust prop has 60% increase in reverse thrust for backing or stopping. Check out the Yamaha T8 right now the best selling kicker the Merc 9.9 Bigfoot is another good choice. If I bought one today I would go with the Yamaha T8, they have several models with Power tilt. I think next year Evinride will come out with a great motor.

 

[rolyat]

Re: What size engine for 27ft sailboat?

I run a 9.9 4-stroke on my 5,000 lb. sailboat. It will make it go 7 kt, which is more than theoretical hull speed (6.4 kt) at full bore. It is lots less stressful to go 5.5 kt at 3/4 throttle. <br /><br />A 9.9 and a 15 are often the same engine with different carburation. It follows that a 9.9 could get better "milage". <br /><br />Something designed for a sailboat auxiliary is best, like my Yamaha 9.9 hi-torque. <br /><br />Good sailing,Doug