SPEED CURVE

A graph comparing engine revolutions per minute and knots of statute miles per hour used to determining speed without the advantage of a log or speedometer..

Related Terms

CROWN

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

crown top piston internal_combustion_engine fire_ring flame engine combustion fire

COLD CRANKING SIMULATOR

An intermediate shear rate viscometer that predicts the ability of an oil to permit a satisfactory cranking speed to be developed in a cold engine. (CCS)

cold_cranking_simulator ccs viscometer cold_engine oil shear_rate speed cold rate shear

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.

deposits oxidation decomposition contamination blow_by engine oil lacquer machine

HARPOON LOG

A log which consists of a rotator and distance registering device combined in a single unit, which is towed through the water. The TAFFRAIL LOG is similar except that the registering device is located at the taffrail, with only the rotator in the water.

harpoon_log device distance log registering taffrail taffrail_log

GROUND LOG

A device for determining the course and speed over the ground in shallow water consisting of a lead or weight attached to a line. The lead is thrown overboard and allowed to rest on the bottom. The course over ground is indicated by the direction the line tends and the speed by the amount of line paid out in a unit of time.

ground_log device water unit weight line overboard course speed ground lead course_over_ground direction rest shallow

ADIABATIC EFFICIENCY

The ratio of actual work output of a heat engine to the ideal output.

adiabatic_efficiency heat_engine ideal_output engine heat ratio output

API ENGINE SERVICE CATEGORY

Gasoline and diesel engine oil quality levels established jointly by API, SAE, and ASTM, and sometimes called SAE or API/SAE categories; formerly called API Engine Service Classifications.

api engine_service_category she astm engine_service_classification engine oil diesel_engine sae engine_oil gasoline service

BROOKFIELD VISCOSITY

Apparent viscosity in cP determined by Brookfield viscometer, which measures the torque required to rotate a spindle at constant speed in oil of a given temperature. Basis for ASTM Method D 2983; used for measuring low temperature viscosity of lubricants.

brookfield_viscosity brookfield_viscometer oil temperature viscosity astm speed constant torque apparent cp low spindle

GUST

1. A sudden brief increase in the speed of the wind of more transient character than a squall, and followed by a lull or slackening of the wind. 2. The violet wind or squall that accompanies a thunder- storm.

gust wind speed lull squall

HEAD TIDE

A tidal current setting in a direction approximately opposite to the heading of a vessel. One setting in such a direction as to increase the speed of a vessel is called a FAIR TIDE. One abeam is called a BEA

head_tide vessel current speed abeam direction fair heading setting tidal tidal_current