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Bourke Brown Signature

17 January 2011

Bourke Brown Signature

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Bourke Brown Signature

Napier Deltic

History and design

The Deltic story began in 1943 when the British Admiralty set up a committee to develop a high-power, lightweight diesel engine for Motor Torpedo Boats. Hitherto in the Royal Navy, such boats had been driven by petrol engines but this fuel is highly flammable, making them vulnerable to fire, and at a disadvantage compared to the German diesel-powered E-boats.

Until this time, diesel engines had poor power-to-weight ratio and low speed. Before the war, Napier had been working on aviation diesel designs (licensed versions of the Junkers Jumo 204) and the Admiralty felt these would be a reasonable starting point for the larger design they required.

Animated diagram of Deltic engine layout

Note: The bottom left input and output ports are shown incorrectly as reversed

The original Napier Culverin was an opposed piston design. Instead of each cylinder having a single piston and being closed at one end with a cylinder head, the elongated cylinder contained two pistons moving in opposite directions towards the centre. This negates the need for a heavy cylinder head. This led to a rather "flat" engine, intended to be buried in the wings of large aircraft. The Admiralty required a much more powerful engine, so for the added power Napier took three of their original Culverins and "bolted them together".

The result was a triangle, the cylinder banks forming the sides, and tipped by three crankshafts, one at each corner. The crankshafts were connected with phasing gears to drive one output shaft. Various models of Deltic engine could be produced with varying numbers of cylinders, though nine and eighteen cylinders were the most common, having three and six cylinders per bank respectively. In 1946, the Admiralty placed a contract with the English Electric Company, parent of Napier, to develop this engine.

One feature of the engine was the way the crankshaft phasing was arranged [being a two stroke] to allow for exhaust port lead and inlet port lag. These engines are called 'uniflow' designs because the flow of gas into and out of the cylinder is one way, assisted by mild supercharging to improve cylinder exhaust scavenging. The inlet/outlet valve order is In/Out/In/Out/In/Out going around the triangular ring (ie the inlet and outlet manifold arrangements have C3 rotational symmetry).

Earlier attempts at designing such an engine failed because of the difficulty in arranging the pistons to move in the correct manner, for all three cylinders in one delta. Napier solved this problem by gearing the crankshafts so that one of them rotated in the opposite direction to the other two.

In an opposed piston design with no inlet or exhaust valves, and no ability to vary the port positions, the Deltic design arranged each crankshaft to connect two adjacent pistons operating in different cylinders in the same plane, using forked connecting rods, one an 'inlet' piston used to open and close the inlet port, and the other an 'exhaust' piston in the adjacent cylinder to open and close the exhaust port.

Crankshaft connecting-rod journals were arranged so that each cylinder's exhaust piston 'led' its inlet piston by 20 degrees of crankshaft rotation. This allowed the exhaust port to be opened well before the inlet port, and allowed the inlet port to be closed after the exhaust port, which led to both good scavenging of exhaust gas, and good volumetric efficiency for the fresh air charge.

Although the engine was cylinder ported and required no poppet valves, it did still have camshafts. Each bank had a separate camshaft, driven at crankshaft speed. This was used solely to drive the fuel injection pumps, each cylinder having its own injector and pump, driven by its own cam lobe.

Uses

Naval service

The Deltic-powered Hunt class Mine Countermeasure Vessel HMS Ledbury

Development began in 1947 and the first Deltic unit was produced in 1950. By January 1952 six engines were available, enough for full development and endurance trials. An ex-German E-Boat, powered by three Mercedes-Benz diesel engines, was selected for these trials, since its power units were of approximately equal power to the new 18 cylinder Deltic engines. Two of the three Mercedes-Benz engines were replaced with Napier Deltics, the compactness of the Deltic being graphically illustrated: they were half the size of the original engines. The Deltic weighed one fifth of its contemporaries of equivalent power.

Proving successful, Deltic diesel engines became a common powerplant in small and fast naval craft. The Royal Navy used them first in the Dark-class fast attack craft. Subsequently they were used in a number of other smaller attack craft. The low magnetic signature lent itself to use in mine countermeasure vessels and the Deltic was selected to power the Ton-class minesweeper. The Deltic engine is still in service in the Hunt-class. These versions are de-rated to reduce engine stress.

Deltic diesels served in MTBs and PT Boats built for other navies. Particularly notable Was the Norwegian Tjeld or Nasty class, which were also sold to Germany, Greece, and the United States Navy. Nasty-class boats served in the Vietnam War, largely for covert operations.

Smaller nine cylinder Deltic 9 engines were used as a marine engine, notably by minesweepers. The Ton-class were powered by a pair of Deltic 18s and used an additional Deltic 9 for power generation for their magnetic influence sweep. The Hunt class used three Deltic 9s, two for propulsion and again one for power generation, this time with a hydraulic power unit integrated as well.

Railway use

Napier Deltic powered British Rail Class 55 Alycidon, at the National Railway Museum, York, UK

Main articles: British Rail Class 55 and British Rail Class 23

The 'deltic' engines were used in two types of British rail locomotive: classes 55 and 23, built in the 1960s - both earned the nom-de-plume or nickname from the type of engines - "Deltics" and "Baby Deltics" respectively.

The Class 55 used two deltic engines: mechanically blown 18 cylinder engines , the Class 23 used a single less powerful nine cylinder turbocharged T9-29 Deltic of 1,100 hp (820 kW).

This section requires expansion.

Reliability in service

While the Deltic engine was successful and very powerful for its size and weight, it was a highly-strung unit, requiring careful maintenance. This led to a policy of unit replacement rather than repair in place. Deltic engines were easily removed upon breakdown, generally being sent back to the manufacturer for repair.

Turbo-compound Deltic

The E.185 or Compound Deltic turbo-compound variant was planned and a single protoype was built in 1956 and tested in 1957. This capitalised on Napier's experience with both the Nomad and their increasing involvement with gas turbines. It used the Deltic as the gas generator inside a gas turbine, with both a twelve-stage axial compressor and a three stage gas turbine. Unlike the Nomad, this turbine wasn't mechanically coupled to the crankshaft but merely drove the compressor. It was hoped to produce 6,000 horsepower[citation needed], with fuel economy and power-to-weight ratio "second to none".. Predictions by the engineers closely connected with it were that connecting rod failure would be the limit on this power, failing at around 5,300 bhp. On test it actually produced 5,600 bhp, before throwing a connecting rod through the crankcase just as predicted. Naval interest had waned by 1958 in favour of the pure gas turbine, despite its heavier fuel consumption, and no further development was carried out.

Further reading

Bryan 'Bob' Boyle (2000). The Napier Way. Bookmarque Publishing. ISBN 1-870519-57-4. 

Alan Vessey (compiler) (1997). Napier Powered. Tempus. ISBN 0-7524-0766-X. 

References

^ a b c d D. K. Brown & George Moore (2003). Rebuilding the Royal Navy. Warship design since 1945. Chatham Publishing. ISBN 1-8617-6222-4. 

^ End on image of Deltic type engine with exhaust manifolds exposed (via the Deltic Presevation Society - Baby Deltic project) thedps.co.uk

^ Here and There. "A 2,500 hp Two-stroke" (PDF). Flight: 392. 2 April 1954. http://www.flightglobal.com/pdfarchive/view/1954/1954 - 0870.html. Retrieved 23 December, 2009. "POWERING H.M. fast patrol boat Dark Hunter, launched on March 18th, is a Napier Deltic engine. An opposed-piston two-stroke diesel, it develops 2,500 s.h.p.; its power/weight ratio (4.2 lb/h.p.) is said to be the highest ever achieved in a marine diesel.". 

^ Vessey, Napier Powered, p. 102

^ Vessey, Napier Powered, p. 104

^ Vessey, Napier Powered, p. 110

^ Webb, Brian (1982). Newton Abbot: David & Charles. ISBN 0-7153-8110-5. 

^ a b Boyle, The Napier Way, p. 121

^ Vessey, Napier Powered, pp. 107-108

^ Boyle, The Napier Way, p. 221

External links

Wikimedia Commons has media related to: Napier Deltic

Deltic technical details.

The Deltic Preservation Society.

Hunt Class Deltic powered Mine Countermeasure Vessel.

Deltic Animations 3-D animations of the piston motion in the Deltic engine.

v  d  e

Reciprocating engines and engine configurations

inline or straight

I2  I3  I4  I5  I6  I8  I9  I10  I12  I14

flat

F2  F4  F6  F8  F10  F12  F16

V or Vee

V2  V3  V4  V5  V6  V8  V10  V12  V16  V20  V24

W

W8  W12  W16  W18

other inline

H  U  Square four  VR  Opposed or Flat  X

other

Single  Radial  Rotary  Deltic  Pistonless (Wankel)

v  d  e

Heat engines

Stroke cycles

Two-stroke cycle  Four-stroke cycle  Six-stroke cycle

Engine types

Coomber  Free-piston  Gas turbine  Iris  Jet  Orbital  Piston  Rocket  Rotary  Split-single  Steam (reciprocating)  Steam turbine  Stirling  Swing-piston  Tschudi  Wankel

Valves

Cylinder head porting  Corliss  Slide  Manifold  Multi  Piston  Poppet  Sleeve  Rotary valve  Variable valve timing  Camless (solenoid operated valves)

Engine configurations

Single cylinder  Straight  Opposed  Flat  U  V  W  H  Deltic  Radial  Rotary  Stelzer  Controlled Combustion  Bourke  Split cycle

Motion

mechanisms

Cam  Connecting rod  Coomber rotary  Crank  Crank substitute  Crankshaft  Linkages (Evans  Peaucellieripkin  Sector straight-line  Watt)  Scotch Yoke  Swashplate  Rhombic drive  Double acting/differential cylinder

Thermodynamic cycle

Categories: Piston engine configurations | Napier Deltic | Napier engines | Diesel locomotive engines | Two-stroke diesel engines | Opposed piston enginesHidden categories: Articles to be expanded from December 2008 | All articles to be expanded | All articles with unsourced statements | Articles with unsourced statements from December 2008
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