Proper outboard HP for Irwin 28

[eugenesdream24]

Hey everyone, I have a dumb question. I'm having problems with my Atomic 4 and have literally been rebuilding it component by component lately. So while I do plan on having my inboard tip top, I thought an outboard, especially as a backup for long cruises, would be a good idea. So I'm going to mount a kicker bracket, and pick up a used long shaft outboard.

My Irwin 28 has a 7800 pound total displacement. So I know I should probably get a 10 horse outboard.

Question is, I found an affordable 8HP Mercury. Would this be powerful enough for my sailboat?

Any and all advice, comments, thoughts are appreciated.

 

[jimg]

Yes. Although a larger would be better, this will work fine. I normally use a 15hp on my C27 of about the same weight, but I have used a 6hp which pushed it at 6 knots easily.

 

[bffatcat]

outboard for 7800 displacement boat

6hp will do the job under most conditions 10 hp will give you more reserve power against a still breeze on the nose or a heavy chop.

 

[Benny17441]

Currents can be real strong in the Long Island Sound. I would advice you look for at least a 15HP outboard.

 

[jepomer]

The 8 HP engine is probably the same engine as the 10 HP (excuse me - 9.9) but has a derated fuel delivery system.

As a back-up motor, it should be sufficient. If you later find a good deal on a 15 HP outboard, this one could be used for something else.

 

[Brian S]

Whatever you get, even a smaller motor, make sure you get (or it already has) a high thrust propellor.

These are usually 3 or 4 round "Mickey Mouse ears" blades, total prop diameter that just fits under the anti-ventilation plate, and has a low pitch measurement.

A high thrust prop will manage any sailboat better than the stock prop, which is usually designed for running jon boats at speed.