Ratings Definitions

Ratings are based on ISO 8665 conditions of 100kPa (29.612 in Hg) and 25 °C (77°F) and 30% relative humidity. Propeller shaft power represents the net power available after typical gear losses and is 97% of rated power. Power rated in accordance with IMCI procedures.

High Output (HO) - QUANTUM ONLY
Intended for use in variable load applications where full power is limited to one hour out of every eight hours of operation. This rating is for pleasure/non-revenue generating applications that operate less than 500 hours per year.

Intermittent Duty (INT)
Intended for intermittent use in variable load applications where full power is limited to two hours out of every eight hours of operation. Also, reduced power operations must be at or below 200 rpm of the maximum rated rpm. This rating is an ISO 3046 fuel stop power rating and is intended for applications that operate less than 1,500 hours per year.

Medium Continuous (MCD)
Intended for continuous use in variable load applications where full power is limited to six hours out of every twelve hours of operation. Also, reduced power operations must be at or below 200 rpm of the maximum rated rpm. This rating is an ISO 3046 fuel stop power rating and is for applications that operate less than 3,000 hours per year.

Heavy Duty (HD)
Intended for continuous use in variable load applications where full power is limited to eight hours out of every ten hours of operation. Also, reduced power operations must be at or below 200 rpm of the maximum rated rpm. This rating is an ISO 3046 fuel stop power rating and is for applications that operate 5,000 hours per year or less.

Continuous Duty (CON)
Intended for continuous use in variable load applications requiring uninterrupted service at full power. This rating is an ISO 3046 standard power rating.

Government Service (GS)
Intended for use in variable load applications where full power is limited to one hour out of every eight hours of operation. This rating is for Federal, State and local non-revenue generating applications that operate less than 500 hours per year.

Pleasure Craft (PC)
Intended for use in variable load applications where full power is limited to one hour out of every twelve hours of operation. Reduced power must be at or below 400 rpm of the maximum rated rpm. This rating is reserved for recreational planing craft used only and exclusively for pleasure and recreation.

Light Commercial (LC)
Intended for use in variable load applications where full power is limited to one hour out of every twelve hours of operation. Reduced power must be at or below 400 rpm of the maximum rated rpm. This rating is government, commercial or any revenue producing craft that operate less than 500 hours per year. Typical applications include customs boats, pilot boats, police craft, patrol boats, charter sailboats and some fishing vessel applications.