How fast will a boat go with a 20hp outboard (see details)?
We’re looking to buy a new boat for our existing 20hp four stroke Honda outboard. This outboard is very light for a 4-stroke – it weighs 49kg. We’re looking at the following boats:
1. Inflatible rubber dinghy, 310cm long (10 feet)
2. Inflatible again, but 340cm long (11 feet)
3. A 14-foot (430cm) inflatible
We also have a choice of either a) RIB (a rigid v-shaped hull made of fiberglass), or b) An inflatible hull, with aluminium panels covering the floor.
My question is, what kind of top speed can I expect in each case, using our 20hp outboard? If you have an opinion on the best kind of boat for such a smallish outboard, I’d like to hear it. The boats I listed above weigh around 50 to 60 kg each.
P.S. our current boat is a 500cm fiberglass boat with an 85hp 2-stroke yamaha and it does about 37mph flat out with two 80kg people on board (as measured with a GPS).
the 20 hp is too heavy, relatively for the 10 or 11′ and the 14 is a softer hull, because it flexes `more it takes more to push it, but I’d think it would plane with a 20 hp honda….. at about 18 to 20 mph. I don’t know your load but I wouldn’t expect much more than that.
good luck!
Edit. The 20 HP puts more weight aft of the CG/ and you and your passenger have to move as far forward as possible in the smaller boats. Even then when you apply power the bow will come up and it’s hard to “push” the boat up on plane. Which can be done with the smaller 8 HP. But the top speed is not going to change much over that 18- to 20 mph range, even with a much larger engine.
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