What size motor do I need for a 20 foot boat?

Motor HP Boat length (feet) Boat length (metres)
5hp – 15hp 8′ – 14′ up to 4.2m
9hp – 20hp 11′ – 16′ up to 4.5m
20hp – 40hp 13′ – 18′ up to 5.0m
40hp – 75hp 14′ – 20′ up to 5.5m

How fast will a 10 hp outboard go?

10 HP Outboard: Speed & Runtime

Power (Watt) Speed (mph/kph) Range (mile/km)
1000 5/8 45/72
2000 6.7/10.8 30.2/48.6
3000 8/13 24/39
4000 11.5/18.5 25.9/41.7

How many HP Does my boat need?

The safest way to determine how much horsepower you need for your boat is to know the total weight of your boat. The rule of thumb is to have 25-40 pounds of weight per 1 horsepower. If your boat weight is 800 pounds you would need a 32-20 horsepower engine.

How much horsepower does a 16 foot boat need?

It can have a range of 50-300 horsepower motors for maximal efficiency. This range already considers the boat’s size and usage. For a standard 16-foot aluminum boat, a 60 horsepower motor will suffice. On average, it can have a speed of about 25-30 miles per hour.

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What is the biggest motor you can put on a 12 foot boat?

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

Can I put a bigger engine on my boat?

Can I use a bigger motor on my boat than what it’s rated for? It is not a violation of Coast Guard regulations to install or use an engine larger than specified on the capacity label, but there may be state regulations prohibiting it, and restrictions from your own insurance company regarding this.

How much horsepower does a boat need to pull a tube?

A boat with horsepower at or above 60 would be sufficient to move at speeds near 15 mph when towing a water tube with a single rider. To tow more riders, the boat may need a horsepower at or above 90. These are not definitive guidelines, though, as heavier boats require more horsepower.

How far below the bottom of the boat should the prop be?

If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches. For a long shaft, I think 20 to 21 inches is correct. Some mornings it just doesn’t seem worth it to gnaw through the leather straps.

How fast will a 5hp outboard go?

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

How fast will a 15 HP boat go?

I clocked my setup with gps at 28 mph with me and my gear. Me and just the boat it will hit 32 mph on glass days. 2 guys and gear takes it down to about 20 to 22 mph.

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How fast is a 20 hp boat motor?

prop. Recommended rpm for this motor is 5400 to 6100 rpm. I am getting 5000 to 5100 rpm. Top speed is 14 mph based on GPS.

How fast can a 100 hp boat go?

But here it is… For every forty pounds of boat weight, you need one horsepower to motor along over smooth waters at 20 miles per hour. So for a 4,000-pound boat, that’s 100 horsepower for smooth, steady cruising.

How fast will a 135 hp boat go?

With a 135 HO etec that boat will run 45-47 mph with the right prop.

How fast does a 250 hp boat go?

When equipped with 250-hp or 300-hp outboards, these types of aluminum fishing boats can typically have a WOT of 55 mph to 60 mph, or a bit more with two people aboard.

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