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Tunnel Thrusters

Stone Marine Propulsion NGC tunnel thrusters can be supplied with fixed pitch propellers (NFT) or controllable pitch propellers (NCT). They are designed to be simple and highly efficient with the fixed pitch version providing reliable performance for all types of vessels and ships. The CPP version allows the use of skewed blades which result in low levels of cavitation and vibration for applications where minimum noise is a main requirement.

The propellers are manufactured from high strength Ni-Al-BR and the drive shaft and gears from high quality alloy steel ensuring a long and reliable service life.

The systems are usually supplied as four separate units, the prime mover, the hydraulic system, the remote control and mechanical sections. Although the prime mover is usually an electric motor, diesel or hydraulic motors can also be supplied.

  • CPP Tunnel Thrusters
  • Retractable Thrusters
  • Fixed Pitch Tunnel Thrusters
  • Drive Systems
  • Control Systems

NCT series of tunnel thrusters

Model Motor power Frequency Input rotation A B C D E F
kw Hz rpm
NCT110 345 50 1450 1158 1126 1200 1100 650 862
400 60 1760
NCT130 450 50 1450 1360 1328 1265 1300 780 932
500 60 1760
NCT150 560 50 1450 1570 1534 1400 1500 880 1040
630 60 1760
NCT165 680 50 1450 1732 1692 1611 1650 950 1146
780 60 1770
NCT180 880 50 1450 1882 1842 1690 1800 1040 1220
930 60 1770
NCT200 1150 50 1450 2082 2038 1890 2000 1160 1327
1000 60 1180
NCT250 1800 50 975 2620 2560 2280 2500 1460 1780
1700 60 880
NCT275 2300 50 975 2890 2810 2335 2750 1635 1911
2000 60 880
NCT300 2800 50 735 3150 3060 2500 3000 1810 2180
3050 60 880

Retractable Tunnel Thrusters

More information on retractable tunnel thrusters will be published here shortly.

NFT Fixed series of tunnel thrusters

Model motor power frequency input rotation A B C D E F
kW Hz rpm
NFT050 60 50 1450 545 525 600 500 345 551
75 60 1755
NFT060 100 50 1450 651 621 800 600 400 623
120 60 1755
NFT070 140 50 1450 751 721 800 700 450 650
170 60 1755
NFT080 220 50 1450 862 822 920 800 500 710
260 60 1755
NFT090 220 50 1450 962 922 920 900 550 800
260 60 1755
NFT110 345 50 1450 1158 1126 1200 1100 650 862
400 60 1760
NFT130 450 50 1450 1360 1328 1265 1300 780 932
500 60 1760
NFT150 560 50 1450 1570 1534 1400 1500 880 1040
630 60 1760
NFT165 680 50 1450 1732 1692 1611 1650 950 1146
780 60 1770
NFT180 880 50 1450 1882 1842 1690 1800 1040 1220
930 60 1770
NFT200 1150 50 1450 2082 2038 1890 2000 1160 1327
1000 60 1180
NFT250 1800 50 975 2620 2560 2280 2500 1460 1780
1700 60 880
NFT275 2300 50 975 2890 2810 2335 2750 1635 1911
2000 60 880
NFT300 2800 50 735 3150 3060 2500 3000 1810 2180
3050 60 880

Control System


HEAD OFFICE: STONE MARINE PROPULSION NGC LTD, OAKWOOD BUSINESS PARK, STEPHENSON ROAD WEST, CLACTON-ON-SEA, ESSEX, CO15 4TL
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