Chopper (propeller)
Encyclopedia
A chopper is a propeller
Propeller
A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and a fluid is accelerated behind the blade. Propeller dynamics can be modeled by both Bernoulli's...

 design especially used for fast boats or boat racing
Boat racing
-Types:* Canoe racing, competitive forms of canoeing and kayaking* Drag boat racing, a form of drag racing which takes place on water rather than land* Dragon boat racing, a type of human-powered watercraft racing...

. It can cope with breaking through the water surface without losing its thrust. This provides the facility to mount the motor higher, which commonly increases speed. Besides this, it has a high progressive rake
Rake
Rake may refer to:* Rake , a horticultural implement, a long-handled tool with tines* Rake or hay rake, a farm implement* Rake or castor angle – various fork offset angles in bicycle and motorcycle geometry...

which leads to a good bow lift.

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