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Designed by Patrick Stirling, they are characterised by a single pair of large (8 ft 1 in) driving wheels which led to the nickname "eight-footer". Originally the locomotive was designed to haul up to 26 passenger carriages at an average speed of 47 miles per hour (76 km/h). [1] They could reach speeds of up to 85 mph (137 km/h). [2]
An example of the 8ft 2" wheeled Caledonian 2-2-2. They were built from 1859 onwards and served as the main express engine until 1885. The final engine was withdrawn from service in 1901.
Modified M548 to carry Electronic Warfare Shelters. Modifications included installation of 60W, 400hz power system and ground rod driver. EW Shelters carried included the AN/MLQ-24 TACJAM, and AN/TSQ-138 [5] Trailblazer Direction Finding systems. [6]
The electrodes for electrical grounding are often called ground rods and are often made from steel with a copper clad surface – typically 1 to 2 m long and 20 millimetres (0.79 in) in diameter. These are driven vertically into the ground and bonded together with bare copper wire . [ 1 ]
Bars are typically 5 to 6 ft (1.5 to 1.8 m) long and weigh 15 to 23 lb (6.8 to 10.4 kg). They are usually made entirely of cylindrical or hexagonal forged steel with a diameter of approximately 1 in (2.5 cm). Chisel and wedge ends typically have a blade width measuring 1 to 3 in (3 to 8 cm).
Power Supply: 12 V DC at 3.0 to 5.0 Amps from external batteries, powering an internal rotary transformer (motor-generator). Later models used a transistorized inverter power supply. [2] Antenna Systems: Mobile station: vertical rod aerials 4 ft, 8 ft or 14 ft high; Fixed station: vertical ground mounted 32 ft mast