The NAIAD Model 254 Fin Actuator Assembly is designed for efficiency, power and rugged reliability.
It is supplied completely factory tested under pressure, assembled and ready for installation
including all required hardware and fittings. Unlike other systems, no disassembly is required for
installation. NAIAD Fin Actuator Assemblies are recognized the world over as the industry standard
The hardened and passivated stainless steel fin shaft, supported by dual heavy-duty tapered roller
bearings within a reinforced cast and machined housing, features a precision-machined self-locking
taper for secure connection with the fin on one end, and a high capacity splined connection to the
torque arm on the inboard end. This installer-friendly design allows the Assembly to be mounted in
any convenient angular (360°) orientation. The powerful double acting hydraulic cylinder rapidly
and accurately positions the torque arm, shaft and fin, as commanded by the stabilizer's control
system, using hydraulic servo valves with closed-loop continuous direct-acting fin position feedback.
Double lower shaft seals mounted in a stainless steel retainer keep the factory-applied severe duty
marine bearing grease in and seawater out. Guaranteed leak proof, NAIAD seals benefit from the
extraordinarily precise machined fits obtained in NAIAD's state-of-the-art manufacturing facility.
The Model 254 is built to last and is virtually maintenance-free.
|Standard Fin Sizes:
||3 sq.ft. (0.28 sq.m), 4.5 sq.ft. (0.42 sq.m), 6.0 sq.ft. (0.56 sq.m), 7.5 sq.ft. (0.70 sq.m), 9.0 sq.ft. (0.84 sq.m).
||Precision machined oversized self-locking taper.
||2.5 in. dia. (63.5 mm) heat-treated stainless steel.
|Fin Actuator Housing Material:
||High-strength ductile iron; 2.5 times stronger per square inch than aluminum.
|Upper AND Lower Bearing:
||Heavy-duty tapered roller bearings by Timken (TM), the best in tapered roller bearings.
||Two double-lip seals for maximum seawater protection. Easily accessible in a 316 stainless steel retainer.
||Double-lip, spring-loaded seal for maximum grease retention. The double-lip design also provides protection of the fin actuator against external contaminants.
||Pre-packed with high quality Lubriplate (TM) water-resistant grease for lifetime maintenance-free service.
||SAE O-ring ports and (JIC) 37° fittings (not pipe fittings) for leak-free service.
||Custom engineered for NAIAD stabilizer applications in collaboration with a world leading cylinder manufacturer. Double acting. Steel body construction with high strength tie rods for heavy-duty service. Self-regulating shock reducing cushions. Teflon seals throughout.
||Head Trunnion mount allows most compact Fin Actuator design. Trunnion freely pivots in dual high capacity roller bearing assembly.
|Maximum Working Pressure:
||3000 psi (207 bar)
|Cylinder Bore Diameter:
||2.00 in. (50.8 mm)
||1.00 in. (25.4 mm)
||Spherical rod ends with a permanently bonded fabric liner for maximum wear protection.
|Rod End Pins:
||Through-hardened, ground and passivated stainless steel.
||Cast and heat-treated high strength alloy steel, cadmium plated for corrosion resistance. Honed bore for precise Rod End Pin fit.
|Shaft-Torque Arm Connection:
||Oversized clamp-type spline for maximum torque capability.
||150 pounds (68.0 kg)
||See dimensional drawing.
|Fit & Finish Throughout:
||High 'yacht' quality, painted, plated and polished.