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M25 Jet Drive
OPERATION
How the Jet Drive Operates
A jet driven boat has substantially different handling characteristics compared to a propeller
driven boat. It is recommended that the operator adjusts to these characteristics by experimenting
in open water at both high and low speeds. The driveshaft driven impeller draws water up through
the water intake and then redirects it at a high pressure through the water outlet nozzle to create
forward thrust. To obtain reverse, the reverse gate moves over the outlet nozzle to direct the water
in the opposite direction.
b
c
a
a - Water intake
b - Water outlet nozzle
c - Reverse gate
When the jet drive is in neutral, the impeller continues to rotate. However, the reverse gate is
positioned so that some of the forward thrust is diverted to create reverse thrust. This approximate
balancing of forward and reverse thrust will minimize any boat movement. Because the impeller
is always rotating and creating thrust when the engine is running, the boat may tend to move
slowly forward or backward. This is normal for a direct-drive jet driven boat. The operator should
be aware of this and use caution whenever the engine is running.
5
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