Should twin outboards be counter-rotating?

Should twin outboards be counter-rotating?

In most applications when a boat requires twin engines to power and push it, the port side engine must use a counter rotation lower unit (often referred to just as gearbox) and the starboard engine uses a normal clockwise rotation lower unit.

What side does counter-rotating motor go on?

Counter-rotating propellers generally spin clockwise on the left engine and counter-clockwise on the right.

Which way do props spin on a twin engine boat?

In twin-engine fixed pitch installations the standard is outward-turning propellors, ie the starboard engine is right-handed and the port one left-handed. With this setup going slow ahead on the starboard engine and half astern on the port engine will move the boat’s stern bodily to starboard.

How do counter rotating propellers work?

In a counter-rotating installation, the propellers on the right wing turn counter-clockwise while those on the left wing turn clockwise. The principle advantage of counter-rotation is to balance propeller torque effects thus eliminating any problems associated with a Critical Engine.

What is Suzuki Selective rotation?

Now, in a move that will please dealers and boat builders alike Suzuki has announced the introduction of Suzuki Selective Rotation, which means that one outboard model can operate in either regular or counter rotation modes.

Are counter rotating propellers better?

The torque on the aircraft from a pair of contra-rotating propellers effectively cancels out. Contra-rotating propellers have been found to be between 6% and 16% more efficient than normal propellers.

What side does the counter-rotating motor go on?

What is the advantage of twin outboards?

Less stress. The engines in a twin-engine setup are subject to less stress than a single-engine because each one is only pulling half its weight in powering the boat. At high speeds, a single-engine may be running at its maximum. At the same speed, twin-engines will be cruising along smoothly and more comfortably.

What side does counter rotating motor go on?

Are counter-rotating props better?

Contra-rotating propellers have been found to be between 6% and 16% more efficient than normal propellers. However they can be very noisy, with increases in noise in the axial (forward and aft) direction of up to 30 dB, and tangentially 10 dB. Most of this extra noise can be found in the higher frequencies.

What is advantage of counter-rotating props?

The principle advantage of counter-rotation is to balance propeller torque effects thus eliminating any problems associated with a Critical Engine. Counter-rotating should not be confused with contra-rotating which refers to two propellers on the same engine which spin in opposite directions.