Shrimp vessel test of the GSM-Marshall automatic marine propeller
In a field comparison of the Marshall propeller with the standard fixed pitch propeller, the Marshall propeller exhibited greater bollard pull during all ranges of the test, and correspondingly, greater fuel consumption during those same ranges. Speed over the bottom during trawling and steaming was 9.8% and 11% greater respectively for the Marshall propeller when compared to a standard propeller. Speed over the bottom per unit of fuel consumed was 17.65% greater for the Marshall propeller during trawling and 6.67% greater during steaming. If a vessel were operating at a fixed engine speed, the addition of a Marshall propeller would allow the towing of larger, and thus more productive, nets. If a vessel owner or captain were to choose to maintain net size, then a reduction in engine speed and thus a corresponding reduction in fuel consumption, would occur. When the wheel was operating at any given rpm under load, and the engine and shaft speed decreased suddenly, insufficient damping was built into the Marshall propeller, so that a substantial vibration of the vessel occurred. This problem could be remedied by increasing the damping of the internal hydraulic cylinders of the Marshall propeller. While in operation, the Marshall propeller operated smoothly, free of the vibration normally associated with three blade propellers.
- Research Organization:
- Mississippi-Alabama Sea Grant Consortium, Biloxi, MS (USA)
- DOE Contract Number:
- FG01-85CE15243
- OSTI ID:
- 6398098
- Report Number(s):
- DOE/CE/15243-T1; ON: DE88000149
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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