Marcílio Dias-class destroyer (1973)

The Marcílio Dias-class destroyer is a class of destroyers of the Brazilian Navy. Two ships of the Gearing-class destroyer were lent by the United States Navy and were in commission from 1973 until 1997.

Development and design
Marcílio Dias was commissioned as USS Henry W. Tucker on 12 March 1945 and Espírito Santo was commissioned as USS Brinkley Bass on 1 October 1945.

The propulsion system and auxiliary equipment consisted of three GE turbines, high pressure cruise and low pressure with reverse gear; 60,000 HP of total power, Falk double reduction gears, which drove two laminated steel propellers, four blades, 4.86 m in diameter; maximum speed 33 knots; maximum speed maintained 30 knots; economic speed 10 knots; 1,746 miles of range at maximum maintained speed; 6,267 miles at economy speed; two electro-hydraulic vertical rudders; driven by Waterbury pumps and by a 3SHP electric motor, 440 volts, three-phase, 60 cycles, governed from the bridge via a tiller, from the helm machine via a wheel and from the helm machine, directly actuating the piston control rod the Waterbury pump.

Four Babcock & Wilcox delta type express boilers with economizer and integral interbeam superheater, with superheat degree control up to 850°F; two GE turbogenerators, 500 kW, 440 volts, 60 cycles, three-phase and 50 kW, direct current 117 volts; two diesel emergency generators GM, 100 Kw, 440 volts, 60 cycles, three-phase; a high-pressure, 3,000 psi, vertical turbocharger; two Consolidate Steel Corp. distillation groups, 12,000 gallons/day and 4,000 gallons/day; 718 t of fuel oil capacity; 7,025 gallons, 6,048 liters of lubricating oil capacity.

In addition to several conventional communications equipment (transmitters, transceivers and receivers), they had: AN/SPS-10D surface-search radar; AN/SPS-40 air-search radar and Mark 25 fire-direction radar. AN/SQS-23F sonar; AN UQC underwater phone equipment; active and passive electronic warfare equipment AN/ULQ-6, CNE WLRI and MAGE.

For navigation, they had: radio direction finding device JLD-1000 Direction Finder; Sperry MKll gyro needle, model c; Lionel-13495 MKl magnetic needle; Lionel 3344MK magnetic needle (government); ET/SON-3v-Coester SA echo sounder; equipment for Omega navigation, in addition to nautical instruments necessary for astronomical and coastal navigation.

On 18 April 1975, with the Marcílio Dias was anchored in Guanabara Bay, a Westland Wasp helicopter landed on board a destroyer for the first time.