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She was of sleek but slightly
odd appearance; her single mast, amidships, also served as uptake for her
exhaust, in a manner only later reflected by any other ship in the company, the
SUILVEN of 1974. ROSE's mast-cum-funnel was duly painted in the Caley yellow
there was already a black top but no lion was added.
What was really important
about this vessel was her propulsion: ROSE was the first ship in either fleet to
be powered not by paddles or a conventional screw but by a Voith Schneider
cycloidal propeller, driven by one six-cylinder Lister-Blackstone diesel engine.
Ernst Schneider' ingenious invention deploying a complex system of gears to
vary the pitch of downward-projecting vanes in a birling drum had not even been
devised with any thought for ships.
Schneider was a Viennese
engineer who, in the 1920s, had amused himself by conceiving a new sort of
water-turbine to harness hydro-electric power from rivers. He boasted of his
invention to Ludwig Kober they met on the Vienna express and Kober in turn
reported the development to his boss, Herr Walter Voith of J M Voith Ltd, an
Austrian engineering company which specialised in water-turbines, pumps and so
on.
Mr Voith's technicians fell on
Schenider's invention, but rapidly ascertained that it was not really as
efficient as a variable-pitch turbine already on their drawing-board. Yet tests
were conducted with true Teutonic rigour, and almost accidentally they
discovered that if one reversed the process, and ran Ernst Schenider's gadget
as a pump it produced a powerful thrust in any desired horizontal direction,
writes Alan Brown, solely by adjustment of the blade oscillatory control and
without having to turn the unit in azimuth. It was quickly appreciated that this
device successfully eliminated all the problems which had bedevilled previous
attempts to design a practical vertically bladed propeller, and as such offered
tremendous potential as a combined propulsion and steering unit for ships.
The dream of the
Voith-Schneider propeller was born; within months there was a Voith-Schneider
unit department at J M Voith Ltd.'s Polten works; and by 1928 there was the
first Voith-Schneider ship a wee 60hp motor-launch, the TORQUEO. She was a
huge success on exhaustive trials in Lake Constance and the Deutsche Reichsbahn
Gesellschaft German State Railways, who ran a big fleet of steamers and
ferries on that lake, quickly took notice. The three ships built for DRG service
on Lake Constance in 1931 were all fitted with twin Voith-Schneider units and
were such a success that the propulsion became standard for all Lake Constance
ships not just those of the DRG, but the Austrian Federal Railway fleet.
Ernst Schneider could now show
off his invention in spectacular style in real service conditions and had
abundant opportunity to fine-tune it further. Though it looks like nothing so
much as a slightly weird blender an ominous revolving drum with projecting
vertical vanes, which can be rotated by ingenious gears to provide equal thrust
in any given direction the Voith-Schneider unit was the biggest innovation
since the advent of the screw-propeller. In one of innovative engineering's rare
happy endings, by the end of the 1930s there were 78 ships worldwide boasting
Voith-Schneider propulsion and Ernst Schneider was a very rich man.
And in 1938 the technology
reached Britain, with a new Isle of Wight ferry, LYMINGTON, produced by
Denny's of Dumbarton and boasting Voith-Schneider propulsion; in one of these
engaging circularities that marks this story, she would end her career as a very
old lady on the Firth of Clyde SOUND OF SANDA< acquired by Western Ferries for
their Upper Clyde crossing in 1974, would survive in service until the end of
1989, still with her original W H Allen engines and over fifty years old.
Yet Voith-Schneider propulsion
was very slow to catch on in Britain partly because of our innate
conservatism, partly because LYMINGTON was long stalked by problems that were
really due to bad hull design; and most of all, after 1939, because it was
German. It was, then, 1967 before it appears in Company history this
extraordinary propeller on the ROSE, acting as both rudder and screw and
directed from her wheelhouse by a single, combined speed and steering-control
pedestal.
ROSE duly emerged from her
last alterations at Lamont's yard in Port Glasgow to run trials on Sunday 11th
June. She attained a mean speed of 9.45 knots and if as Iain MacArthur
observes this was hardly an improvement on the old COUNTESS [OF
BREADALBANE]... this deficiency is partially compensated for by her
remarkable manoeuvrability. The CSP's latest acquisition took up service on the
Largs-Millport crossing on the evening of Monday 12th June 1967; a
week later, she appeared with a new name, KEPPEL, after the Isle of Cumbrae's
secondary pier. It was duly registered on 27th June but, to general
surprise, the ship remained registered at London, not Glasgow.
Though small, distinctly slow,
definitely cramped her passenger facilities were pretty spartan - and of very
odd appearance KEPPEL survived for many years. At first supported by some MAID
or other, running a Millport service from Wemyss Bay; then the rather skeletal
car ferry service to Millport from the ABC ferries; and finally, from the spring
of 1972, by various vessels on the new Cumbrae Slip vehicular service from
Largs, KEPPEL just kept on going.
More, she became surprisingly
popular. And she had proved an important pioneer: it is no exaggeration to say
that the success of her Voith-Schneider machinery was a big factor in choosing
such units for the new Skye ferries of 1970; and, later, for the Upper Clyde
streakers built between 1973 and 1977 not to mention Voith-Schneider units
in yet more double-ended car ferries constructed for Caledonian MacBrayne in the
80s and 90s.
By the end of 1970 she was the
only ship to berth overnight at the Cumbrae pier and by the end of 1974, she was
the Company's only vessel to serve Millport regularly. That same year, the lower
reaches of her funnel were painted red and for the first time she acquired a
tiny lion. Through the week she started berthing overnight at Rothesay so she
could carry out one of the morning commuter runs to Wemyss Bay.
For her first three years with
the CSP, KEPPEL was employed year-round on the Largs to Millport station. But
there was no winter service in 1970-71, nor subsequently, and then and
thereafter she whizzed about off-season as handy spare passenger tonnage, being
seen, records Iain McCrorie, at Kilcreggan; the old North Bank terminal at
Craigendoran; the Holy Loch and Dunoon. In March 1974 she opened CalMac's new
Ardyne contract, bearing oil-rig workers from Wemyss Bay to Innellan; later, she
would relieve McAlpine's own vessel, QUEEN OF SCOTS, sailing from the Ardyne
yard to Rothesay.
But Ardyne's yard closed in
1977 (with the loss of many jobs) and thereafter KEPPEL was laid up of a CalMac
winter She did emerge in March 1980 to convey Millport schoolchildren the
LARGS was toiling with Cumbrae passenger traffic in the absence of ISLE OF
CUMBRAE (1977) for overhaul but probably wished she hadn't, for KEPPEL broke
down in heavy weather and ran aground at Farland Point, sustaining considerable
damage. She was repaired in time to assumer her summer duties, including a new
feature an afternoon cruise round Cumbrae.
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