auxilary outboard

[muz1000]

anyone have an idea what size hp i need for a bayliner 2855.

 

[neale]

anyone have an idea what size hp i need for a bayliner 2855.

Realistically on a boat of that size you would need something so heavy it would have to be permanently and probably professionally mounted. As an absolute minimum you might get away with something like a Yamaha 9.9 long shaft high thrust with a weight of around 45kgs.

 

[Jim@sea]

I had a 23 ft boat with an Evinrude 9.9 hp Auxiluary. Screaming its head off it would only do 3 knots. Had I kept the boat I would have put a 15 hp Auxiluary on. Because the 9.9hp and the 15hp are the same engine. Weighs the same. The 9.9 has been detuned for Europe's Inland Waterways where 10hp and above are banned. So with a 15 hp bigger propellor you may get 5 knots at less engine revs.
(no other engine apart from the 9.9 (as I understand it) is treated the same way. there are no 4.9 or 14.9 etc. And Outboard manufactures could not be bothered making a specific 9.9 as it was easier to de-tune an existing engine.
Am I wrong.

 

[ontheplane]

As others have said - you'll struggle to get anything "portable" do do a decent job there.

Try a Hi-Thrust or Sailpower type motor - but I agree you'll need a 9.9 absolute minimum to get any decent usability.

If all you want is to get some steerage, and accept you're not going to get any decent speed up a 9.9 should be fine - if however you want to push 5 knots or so you're going to need probably 20+ HP which is not practical as an auxilliary really.

So, the answer is, "what are you looking to achieve from the auxiliary?"

 

[landlockedpirate]

I think you may be able to go a little smaller, as long as its an engine designed for the job.

If you have got a permenant mount for it go for a 8hp, 4 stroke saildrive.

If it needs to be portable, try and find a Tohatsu 9.8, 2 stroke. They weigh less than 30kg, so are just liftable and you can get a wide range of props to suit. Another option (and probably the cheapest) is a Mercury/Mariner 8hp, 2 stroke Saildrive. They weigh nearly 40kg, and are very difficult to manhandle in longshaft spec.

I had a 5hp on a 2651 (2655) and it went about 3kts top speed, with a saildrive prop it improved to 5kts.

 

[neale]

I think you may be able to go a little smaller, as long as its an engine designed for the job.

If you have got a permenant mount for it go for a 8hp, 4 stroke saildrive.

If it needs to be portable, try and find a Tohatsu 9.8, 2 stroke. They weigh less than 30kg, so are just liftable and you can get a wide range of props to suit. Another option (and probably the cheapest) is a Mercury/Mariner 8hp, 2 stroke Saildrive. They weigh nearly 40kg, and are very difficult to manhandle in longshaft spec.

I had a 5hp on a 2651 (2655) and it went about 3kts top speed, with a saildrive prop it improved to 5kts.

It's not so much getting the boat moving, or even outright speed, it's controllability. I have moved my 2455, (same as your 2651), with a 4hp in a marina perfectly fine. Add a bit of wind on the bow, some little waves and some current and the 9.8hp Tohatsu was pretty much a waste of time. I think a 2855 with its extra windage will be too much of a challenge for these engines.

 

[DAKA]

anyone have an idea what size hp i need for a bayliner 2855.

I had a 4.5 on the back of a bayliner 2651 , I did use it once and it did save me but I was very lucky and only needed to motor 300 meters into a sea lock and to safety.

Single engined boat, its just one of those things, you have to cruise with a mate or rely on the RNLI.

 

[landlockedpirate]

It's not so much getting the boat moving, or even outright speed, it's controllability. I have moved my 2455, (same as your 2651), with a 4hp in a marina perfectly fine. Add a bit of wind on the bow, some little waves and some current and the 9.8hp Tohatsu was pretty much a waste of time. I think a 2855 with its extra windage will be too much of a challenge for these engines.

I wouldn't disagree, but its amazing how much performance improves with the right prop for the job.