A propeller drive system similar to the lower part of an outboard motor extending below the hull of a larger power boat or yacht, but driven by an engine mounted within the hull. Unlike a fixed propeller (but like an outboard), the boat may be steered by twisting the drive.

Related Terms

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

ASME SECTION I

Power Boilers.

AGGLOMERATION

The potential of the system for particle attraction and adhesion.

REMOTE REFRIGERATING SYSTEM

Refrigerating system in which condensing unit is away from space to be cooled.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

REFRIGERATING CAPACITY

The ability of a system to remove heat as compared with the cooling effect produced by melting of ice.

ADIABATIC PROCESS

A thermo-dynamic process in which no heat is extracted from or added to the system of the process.

DEPOSITS

Oil-insoluble materials that result from oxidation and decomposition of lube oil and contamination from external sources and engine blow-by. These can settle out on machine or engine parts. Examples are sludge, varnish, lacquer and carbon.

RUNNING TIME

Amount of time an unit, equipment or system is run per hour or per 24 hours.

ACID CONDITION IN SYSTEM

Condition in which refrigerant or oil in a system, is mixed with vapor and fluids that are acidic in nature.

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