# How fast will a 4 hp motor go?

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A 14 foot boat designed as a planing hull might get up to 6 or 7 miles per hour. If it’s a four cycle motor it will be a heavy weight in the back end. Make sure the gas hose is long enough to place the tank way in the front.

## How fast will a 5 hp outboard go?

It would do around 67 mph on the race course. On a small hydroplane race boat about 55 mph with a 15hp johnson or mercury and a racing lower unit. Anything else will be slower. This is me in a little bigger boat with a 30hp engine.

## How fast is a 5 horsepower motor?

High Performance. Runs at 5 HP, with a maximum speed of 3450 RPM, synchronous speed: 3600 RPM, Voltage: 208-230V, Frame: 56, easy to use.

## How fast can a 3 hp engine go?

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).

## How much thrust does a 4hp outboard have?

Thus 1 HP (735 W) would acchieve a thrust of 370 N/V[m/s], which would be 160 lbs/V[kn]. Thus for a propeller designed for 3 kn speed (typical electric system) the thrust is ~50 lbs/HP, but for a 6 hp outboard designed for 6 kn it would be less than 30 lbs/HP.

## How many pounds of thrust does a 5 hp outboard motor have?

A 5 hp probably has somewhere near or over 200 pounds of thrust.

## How fast is a 9.9 hp boat motor?

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. In my experience with similar craft and outboards, this sounds very reasonable.

## How fast does a 10 horsepower motor go?

View Full Version : 10 H.p. = 1.5 M.p.h.

## How fast can a 2.5 hp outboard go?

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.

## How do you calculate speed from horsepower?

Relating Horsepower to Speed

You know the horsepower rating of the engine, and now you know the thrust, so you can calculate the speed the car will travel using the relationship: Speed = Power/Force. To arrive at an answer, we note that that 1 Horsepower = 550 ft.

## How many horsepower is 50 lbs of thrust?

Pounds of Thrust to Horsepower Chart

Pounds of Thrust (lbs) Amps Horsepower
40/45 42 0.5
50/55 50 0.6
70 42 1.01
80 56 1.35
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## How fast is 79cc in mph?

How fast is a 79cc go kart? Maximum Speed:15 mph May vary depending on road condition, rider weight etc.