Tri-Hull or Tunnel Hull: Popular with fisherman as well as with sport boat enthusiasts, tri-hulls, also called cathedral hulls, have a combination M-shaped bottom. They’re quite buoyant and stable and they get on plane quickly. They offer good volume below and significant deck space above.

A 16′ fiberglass boat will prob need at least a 50 hp outboard, just to get you up on plane, and you probably be able to go up to a 115hp or so.

It depends on the weight and style of the boat, but any boat in that range should be able to get up on plane(20ish mph+) A 70 on a 15′ fiberglass boat would probably reach 40mph, maybe 45 tops, on a 19 foot boat I doubt you’d be able to go much above 25.

A 40hp Pontoon boat with an average load of people can expect to reach speeds of around 10 – 15 mph.

The 5hp engine will put you in the 10mph range, while the 7.50-10hp engines will push you 15+ mph.

Assuming this is a light 14′ utility boat and a standard 9.9, Mercury would recommend a 8.5 to 9.5 pitch prop for the OP’s application and predicts a top speed around 20 mph.

Suzuki 5HP

9E. New innovations allowed Tohatsu to introduce a new Electronic Fuel Injection (EFI) four stroke outboard to its lineup; meet the 9.9hp EFI Sport. The lightest weight outboard in its class features exceptional torque and top end speed so you can get where you need to go in a flash.

To give you a simple reference, a 3 hp electric outboard can push a 12 ft boat with 150 kg (331 lbs) load at a max speed of 9 km/h (5.6 mph). That’s to say the 3 hp outboard motor can provide more than sufficient propulsion for a 10 ft tender or work as an auxiliary power for a daysailer of up to 1.5 tonnes (3307 lbs).

Here are our results. Tohatsu 2.5 Two-Stroke ($630; www.tohatsu.com) power: 2.5 hp weight: 26 pounds top speed: 5.4 mph noise at full throttle: 84 dB-A.

The rule of thumb I go by is 1 HP = About 22 lbs of thrust. So it’s about 55 lbs of thrust for 2.5 HP.

For example, a twelve-foot boat with a four-foot transom width translates into a maximum engine size of fifteen horsepower.

We’ve done the research for you and compiled a list of the top small boat engines.

• Volvo Penta.
• Suzuki Marine.
• Honda Marine.
• Tohatsu Outboards / Nissan Marine.
• APS.
• Cummins.
• Torqeedo.
• Lehr. Lehr’s product line offers a 2.5, 5, 9.9, and 25 horsepower engines.

But with a quiet outboard motor, you will enjoy every moment on your boat. In this article, we will share with you top 5 quietest outboard motors to buy today….

• Sky 2-Stroke 2.5HP Superior Engine.
• Sky 3.5 Hp Superior Engine Water Cooling System.
• SEA DOG WATER SPORTS Outboard Motor.
• LEADALLWAY 4HP 4Stroke Outboard Motor.