Posted by dgoodhue on 11/06/15 - 7:54 PM
#35
Superaquarama wrote:
Grabbing the thread a bit here, but I'm wondering about going down in power.
We have a 50 horse Yamaha on out S/Sport 15, which I assume is the original motor circa 1989. Whilst there's nothing wrong with it apart from the usual heavy fuel consumption of a 2 stroke (starts easily, runs fine if a little unhappy at low harbour speeds etc), it is a bit old and I have the chance of a Yamaha 25 4 stroke in very nice order and to the right spec. at a good price.
No idea how fast the boat will go as I've never had it to WoT, but it sees 25kts very easily with 1 or 2 aboard. Boat only used for fishing and as a runabout, so speed and power not too important, but I wonder nevertheless whether I'll find it 25 hp adequate. I'm sure it will be happier at low speeds; our harbour has a 4kt speed limit amongst the moorings.
Any thoughts, anyone ?
I personally wouldn't do a 25hp on 15'. I found a person who did 26mph with 25hp tiller. Additonal weight and passengers will quickly drop the speeds. You will likely find your self at wot or near wot most of the time. I have been on classic 13' whalers with 25hp and I would want that to be the minimum performance that I would want. On a 15' that is probably 30hp.