KONRAD 560 - 520 Stern Drive Description

Recreational Performance
Maximum Recommendation:
1000 Nm (738 lb. ft.) of torque for
diesel or gas applications. Maximum
operation: 250 hours per year for planing
type hulls of highly intermittent operation.
Gross weight to horsepower less than
15.2 kg/kw (25 lbs./hp). This classification
includes private, non-commercial, non-
charter, sport/leisure activity craft. Long
range pleasure cruisers, sport fishing
charters and commercial service craft
are NOT in this service classification.
Standard warranty.
Commercial/Military
Performance
Maximum recommendation:
755 Nm (557 lb. ft.) of torque for semi
displacement and planing hulls of
intermittent operation. Maximum operation:
1000 hours per year and gross weight
to horsepower less than 21.3 kg/kw (35
lbs./hp). This classication includes light
commercial charter/sport activity craft,
patrol and crew boats. Standard warranty.
Medium Duty Performance
Maximum operation:
678 Nm (500 lb. ft.) of torque for semi-
displacement and displacement mono-
hulls of intermittent operation with some
variations in engine rpm and power.
This classication includes charter and
commercial craft. Note: These applications
must be approved by the factory. Standard
warranty.
520 Classications
520 Stern Drive Description
The Konrad 520 stern drive is the hardest working stern
drive in the marine industry today. Designed for high-
use, endurance-type applications, the Konrad 520 is
recognized for its versatility and long-term durability.
It is not a “pleasure” drive. It’s a working drive that
can take you shing all day or patrol harbors 24/7. The
Konrad 520 is the only commercial-rated stern drive
available for diesel applications in the 180-440 hp
(134 - 328 kw) range.
The Konrad 520 stern drive is designed to
accommodate aluminum or stainless steel propellers
with three (3) to ve (5) blades. Propellers are chosen
depending on the application and performance criteria.
The maximum diameter propeller size for the Konrad
520 stern drive is 20 in. (50.8 cm).
500 SERIES INSTALLATION MANUALJULY 2016 PAGE 1