158:, an Hispano automobile engine innovation which brought the cooling water into direct contact with the steel cylinder barrel rather than by screwing it into an aluminium water jacket. This improved cooling, simplified assembly and allowed larger cylinder bores without increasing their separation. The cylinder barrels were open at top and bottom and threaded for screwing into the block only near the top, with valve seats ground into the aluminium cylinder head. The lower end of the barrel extended into the crankcase, simplifying both manufacture and assembly. Block and crankcase were bolted together.
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192:
both there and in other previously aluminium components. Though rather brittle, Elektron metal has only 2/3 the density of aluminium and the result was a 20 kg (44 lb) weight reduction from the 12Mb to the 12Mc. The 12Mc also had an increased compression ratio of 7.0, raising the
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power from the nominal 478 kW (575 hp) of the 12Mb to 477 kW (640 hp). The model 12Md retained the
Elektron metal components but returned to the 6.2 compression ratio of the 12Mb. Both 12Mc and 12Md had geared down versions, the 12Mcr and 12Mdr respectively.
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of 6.2 and a maximum power output of 432 kW (580 hp) at a speed of 2,100 rpm. In geared-down form it became the 12Mbr. These both had aluminium crankcases but the next model, the 12Mc of 1930, replaced the aluminium with
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government, in the form of the KTA (Kriegstechnischen
Abteilung or War Technical Department) purchased construction licences for the 12Mb and in 1932 sixty units were built at the Schweizerische Lokomotiv- und Maschinenfabrik factory.
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at sea level and only developing its maximum power at 2,000 m (6,490 ft). A final 12M variant, the 12Mdsh run in 1932, addressed this problem differently; it was the first
Hispano-Suiza engine to be
135:
of 27.0 L (1,648 cu in), the other being the 36.0 L (2,197 cu in) 12N. Apart from capacity and power, these two engines had much in common. The 12M first ran in 1927 and the 12N a year later.
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surface hardening process on the cylinder walls, which reduced both wear and oil consumption. They also used a novel, complicated but effective method of
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The 12Mc was an early example of an attempt to solve the problem of falling engine power with increasing altitude; it was "undercharged", running
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could be added or removed quickly; some earlier
Hispano-Suiza engines offered gearing but as a permanent fixture on a specific sub-type. The
578:
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Up to 1927, Hispano-Suiza's many engine types, of various layouts and cylinder numbers, were all recognisable developments of the
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was one of two new V-12 engine designs first run in 1927–1928. It produced about 375 kW (500 hp), was the first to use
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turbine. It produced 477 kW (640 hp) at 2,250 rpm at an altitude 2,950 m (9,678 ft). Test flown in a
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237:, powered by a 12Mc engine, set a 500 km closed-circuit record of 308.78 km/h (191.91 mph) on 2 June 1932.
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Nominal power 477 kW (640 hp) at 2,250 rpm and altitude 2,950 m (9,678 ft). First supercharged version.
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278:
Compression ratio 6.2. Nominal power 428 kW (575 hp) at 2,100 rpm. Elektron crankcase and other components.
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Compression ratio 7.0. Nominal power 477 kW (640 hp) at 2,200 rpm. Elektron crankcase and other components.
213:, it maintained power up to 5,500 m (18,000 ft). The 12M series was developed into the 12X (Type 72)
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432:
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Compression ratio 6.2. Nominal power 421 kW (565 hp) at 2,000 rpm. As 12Mb but with Farman reducer.
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131:. The Hispano-Suiza 12M, known by the manufacturers as the Type 57, was the smaller of the V-12s, with a
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cooling, enhancing the local lubricant flow without requiring high overall oil pump speeds.
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on the outer faces. There were three carburettors per bank, each charging a pair of
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154:. Much of the new technology was in the cylinder design: these types introduced
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Compression ratio 6.2. Nominal power 428 kW (575 hp) at 2,000 rpm.
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The first commercial version of the 12M was the 12Mb of 1929. This had a
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123:. 1927-8 saw the introduction of four completely new engines, two
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469:. Warrendale, USA: SAE International. pp. 135–143, 484.
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180:gears added 45 kg (99 lb) to the weight.
161:The 12M and 12N engines were the first to use the
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8:
105:into Hispano-Suiza's aircraft engine range.
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553:. New York: Portland House. p. 699.
138:Both 12M and 12N were 60° V engines with
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311:Lioré et Olivier LeO 252, 235, 234, 236
246:List from Hispano Suiza in Aeronautics.
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408:(normal) 421 kW (565 hp) at 2,000 rpm
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172:Both types were designed so that
284:As 12Md but with Farman reducer.
272:As 12Mc but with Farman reducer.
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551:Jane's Encyclopedia of Aviation
68:Société Francaise Hispano-Suiza
720:Hispano-Suiza aircraft engines
549:Taylor, Michael J. H. (1989).
1:
715:1920s aircraft piston engines
330:Hispano-Suiza in Aeronautics.
512:Hispano Suiza in Aeronautics
497:Hispano Suiza in Aeronautics
467:Hispano Suiza in Aeronautics
316:Nieuport-Delage 622 and 629
217:engine, first run in 1931.
127:and two with six cylinders
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322:Specifications (12Mbr/500)
101:hardening and introduced
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29:
433:List of aircraft engines
514:. pp. 147, 177–81.
335:General characteristics
109:Design and development
465:Lage, Manual (2004).
725:V12 aircraft engines
499:. pp. 177, 484.
370:27.0 L (1,648 cu in)
235:Blériot-SPAD S.91-7
221:Operational history
103:wet cylinder liners
343:V-12, water cooled
18:Hispano-Suiza 12Md
702:
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413:Compression ratio
379:455 kg (1,003 lb)
301:Blériot-SPAD 91-7
185:compression ratio
174:epicyclic gearing
95:Hispano-Suiza 12M
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16:(Redirected from
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361:170 mm (6.69 in)
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53:National origin
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306:Dewoitine D.32
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190:Elektron metal
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602:Hispano-Suiza
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529:"SPAD S-91/7"
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427:Related lists
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406:Power output:
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532:. Retrieved
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366:Displacement
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295:Applications
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215:supercharged
203:supercharged
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167:main bearing
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140:carburettors
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133:displacement
112:
94:
92:
78:Marc Birkigt
400:Performance
115:World War I
99:gas nitride
709:Categories
439:References
384:Components
375:Dry weight
156:wet liners
84:First run
686:Turbojets
327:Data from
269:12Mcr/500
257:12Mbr/500
152:cylinders
74:Designer
422:See also
263:12Mc/500
251:12Mb/500
241:Variants
148:exhausts
534:18 July
694:Verdon
557:
510:Lage.
495:Lage.
473:
357:Stroke
287:12Mdsh
207:Rateau
178:Farman
144:inlets
129:inline
58:France
341:Type:
281:12Mdr
227:Swiss
125:V-12s
87:1927
47:V-12
44:Type
666:14AB
661:14AA
555:ISBN
536:2013
471:ISBN
348:Bore
275:12Md
225:The
198:lean
146:and
93:The
30:12M
676:18S
671:18R
656:12Z
651:12Y
646:12X
641:12N
636:12M
417:6.2
395:2:1
118:V-8
711::
631:9V
520:^
485:^
447:^
233:A
142:,
626:8
621:6
594:e
587:t
580:v
563:.
538:.
479:.
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20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
