| Builder | Alex Hall & Co., Aberdeen No 633 1931 |
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Length between verticals |
110ft |
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Beam |
26ft 3ins |
Draft |
14ft |
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Displacement |
239 tons (dry) |
Engine |
Triple expansion, 1150hp, Built by A. Hall & Sons, Aberdeen. Engine No 633 HP 16.5" IP 27" LP 45" stroke 30" |
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Boiler |
Triple burner wet back Scotch type. |
Fuel |
Heavy Oil Converted from coal in April 1964. |
| Oil Burning system by Todd | Installed April/July 1964, installation No 3503 |
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Fuel capacity |
110 Tons |
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Propeller |
Four blade, Cast iron, 2 tons 10ft 6" diameter |
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Tailshaft Seal (original ) |
KD601 size "C" 10 No 3691 or 3692. Two were made at the same time by Cedervall of Sweden, and delivered on 22nd December 1930, the other was for Contest. (see link page for Cedervall) |
Water Capacity |
16 tons aft, 4 tons each side, 10 tons? fwd |
Water Capacity Total |
34 tons |
Steam pumps x2 |
Thomas Lamont & Sons, Paisley No 15600 (fwd) No 15601 (aft) Both 6" x 4.5" x 6" 30 tons per hour |
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Steam generator (110 volts) |
Shanks Engine No E42198 5.5" cyl 3" stroke Driving a Witton generator 110 Volts 68amps 7.5 Kw @ 550 revs |
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Steam Windlass |
Emerson Walker No 62232 |
Steam steering engine |
Donkin and Co No 5995 |
| Circulating engine (condenser) | Drysdale No E 4390 |
| Diesel Generator |
Onan type 13.5MDKAD-137 rating: 13.5kVA, 230V, 50Hz, 58.7A, single phase |
| Telegraph | Ray and Co. London W. 1043 |
| Anchor |
7.5 cwt |
| Accommodation (9) |
Two cabins in the forward saloon for Master and Chief Engineer. Seven berths in the aft accomodation one is partitioned off for the Mate |
The Triple Expansion Engine
An animation of a triple expansion engine. High pressure steam (red) enters from the boiler and passes through the engine, exhausting as low pressure steam (blue) to the condenser.
The development of this type of engine was important for its use in steamships as by exhausting to a condenser the water can be reclaimed to feed the boiler, which is unable to use seawater. Additionally by maintaining a vacuum in the last stage and in the condenser more work can be extracted from the steam and efficiency improved over land-based steam engines where they exhausted their steam to atmosphere. Land-based steam engines could exhaust much of their steam, as feed water was usually readily available. Prior to and during World War II, the expansion engine dominated marine applications where high vessel speed was not essential. It was however superseded by the steam turbine where speed was required, for instance in warships and ocean liners. HMS Dreadnought of 1905 was the first major warship to replace the proven technology of the reciprocating engine with the then novel steam turbine.
A boiler almost identical to that on Challenge.
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Click here to see the drawing of the general arrangements of Challenge and Contest (PDF Format)
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A diagram of the type of boiler on Challenge
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Diagram of the condenser |
Large file, recommend broadband only |
