kicker for CD25?

[serpa4]

Will a 6ph get to hull speed? What can you expect for 6hp? Good enough for a backup motor?

I used to have a 30ft x 10ft beam, 15,000 lb Cutwater C30. I used a 20hp outboard as a kicker in emergencies and also to put on the back of my dinghy for shore runs (dual purpose win win). It weighed 94 lbs. I over estimated my strength and moving it back and forth from the swim deck to dinghy was hard, very tipsy on a rocking boat, not enough leverage to stand on the rear deck and place on the dingy, and felt like I'd drop it in the water.

Seems like a 6hp is manageable weight for a dinghy and moving to the CD25 as a kicker or storage bracket.
Unfortunately, 6hp won't likely plane a dinghy with my wife and i at 370 lbs combined weight.


5-6ph = about 55-57 lbs
8-9.9hp = about 82-92 lbs
15-20hp = 94-99+

[thataway]

You must be talking about 2 stroke motors?? I feel the 6 hp (really the same engine as the 4 hp, except at top RPM, will push the boat. at 4 or so knots, in calm. 20 hp is an egg beater. With a large foot and big prop, 20 hp works well. With the usual props, it is an "egg beater".

[serpa4]

Thank you for the information on the 20 horsepower. However the engine that I'm talking about are all four strokes. You look at Mercury, tohatsu, Honda.. not hondas, and Yamahas they all weigh about the same for the equivalent horsepower. My 20 horsepower kohatsu weighed 94 lb in a four-stroke with fuel injection and electronic ignition. I'm also talking about the ones that do not have electric start. That adds like 15 lb to each motor.

[colbysmith]

A 6hp Tohatsu pushed my 22 up to about 5-6mph. That was in 1-2 ft chop as well. The Yamaha 9.9 on my 25 does about the same thing. I don't know if the 6 would do as well as the 9.9 on a 25, but I'm thinking it would come pretty close.

[serpa4]

[srbaum]

The prop on the 6 hp Tohatsu can be changed to achieve high thrust, for heavy loads. This outboard is sold as a Sailpro, but the prop is REALLY the only difference, aside from the 12 volt charger, off of the engine, which will provide a small charge to a battery.
I changed the prop on my 6 hp Tohatsu (aka Tohatsu with a Mercury decal), that is on my 25', x 16" trimaran sailboat. The stock prop required 2/3 or more throttle to achieve 5 kts, but the high thrust prop hits 5.5/6 kts, at 1/2 throttle. Less noise and much less fuel burn. The prop is part numbest 399B645121.

[serpa4]