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housing were replaced by short studs and flanges at each end of the cylinder barrels. Light alloy was used for the cylinder heads and con rods, while the valve gear was adopted with little change from the Hermes IV. The
Claudel-Hobson down-draught carburetter featured independent altitude control, and the dual-redundant magnetos were of B.T.H. S.G.4/2 type.
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Although completely new designs, they were of generally similar layout to the previous inverted engines, being air-cooled inverted four-cylinder inline designs. Like the others the Minor had a robust steel five-bearing crankshaft, but unlike them the long studs bolting the cylinder heads to the crank
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The Cirrus Minor was introduced in 1935. Two years later, Cirrus Hermes
Engineering lost its identity as a separate company and was adopted as an operating division of its parent company, which by then had become
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Napier remained
Technical Director and, while he completed the development and initial sales of the Cirrus Minor and its larger stablemate the
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engine was redesigned to operate on 77 octane fuel, as opposed to the original's 70, increasing power to 100 hp (75 kW).
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is a
British four-cylinder, inverted, in-line air-cooled aero-engine that was designed and built by the Cirrus Engine Section of
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The Minor was known for excellent reliability, and had a major "win" when it was selected to power the
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series of light aircraft engines. Design was led by
Technical Director C. S. Napier, son of
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observation aircraft. The RAF's version had several modifications, known as the
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A preserved
Blackburn Cirrus Minor II is on public display at the
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started life as a clean-sheet replacement for the original
581:. Marlborough, Wiltshire: Airlife Publishing, 2003.
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573:. Wellingborough: Patrick Stephens. p. 40.
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533:www.rafmuseum.org.uk Retrieved:1 January 2014
8:
54:Air-cooled 4-cylinder inline piston engine
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579:British Piston Engines and their Aircraft
531:RAF Museum Cosford - Blackburn Cirrus II
366:1 inlet and 1 exhaust valve per cylinder
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118:Blackburn Aeroplane & Motor Company
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296:Inline air-cooled inverted 4-cylinder
154:. Although externally identical, the
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793:Air-cooled aircraft piston engines
571:World Encyclopedia of Aero Engines
120:and moved to Brough in Yorkshire.
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808:Inverted aircraft piston engines
37:
275:Specifications (Cirrus Minor I)
268:Royal Air Force Museum Cosford
1:
803:1930s aircraft piston engines
505:, 28 February 1935, pp.218-9.
691:Cirrus-Hermes/Cirrus Hermes
521:, 13 June 1935. Supplement.
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798:Blackburn aircraft engines
397:90 hp (67 kW) at 2,600 rpm
94:Blackburn Aircraft Limited
46:Blackburn Cirrus Minor 2A
45:
36:
31:
682:American Cirrus Hi-Drive
475:List of aircraft engines
184:British Aircraft Swallow
18:Blackburn Cirrus Minor I
415:0.45 hp/lb (0.73 kW/kg)
288:General characteristics
199:General Aircraft Cagnet
194:Elliotts of Newbury Eon
569:Gunston, Bill (1986).
517:"The 'Cirrus Major'",
501:"A New Small Engine",
431:Blackburn Cirrus Major
100:Design and development
90:Blackburn Cirrus Minor
562:14 March 2007 at the
411:Power-to-weight ratio
372:1 Claudel carburettor
542:Lumsden 2003, p. 90.
239:Taylorcraft Auster I
679:American Cirrus III
642:Cirrus Aero Engines
630:Cirrus aero engines
425:Related development
244:Taylorcraft Plus C2
174:Auster J-1 Autocrat
96:in the late 1930s.
729:Blackburn Aircraft
437:Comparable engines
329:39.9 in (1,013 mm)
261:Engines on display
249:Taylorcraft Plus D
148:Taylorcraft Auster
137:Blackburn Aircraft
73:Blackburn Aircraft
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772:Cirrus Bombardier
402:Compression ratio
204:Hillson Helvellyn
110:Cirrus and Hermes
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341:25.6 in (650 mm)
335:17.9 in (455 mm)
314:5.00 in (127 mm)
305:3.94 in (100 mm)
209:Marendaz Trainer
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577:Lumsden, Alec.
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564:Wayback Machine
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382:Cooling system:
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323:243 cu in (4 L)
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114:Montague Napier
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64:United Kingdom
60:National origin
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32:Cirrus Minor
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751:Cirrus Major
738:Cirrus Minor
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550:Bibliography
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458:Hirth HM 504
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370:Fuel system:
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319:Displacement
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219:Miles Gemini
162:Applications
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125:Cirrus Major
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106:Cirrus Minor
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89:
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26:
731:(1936-1960)
693:(1931-1934)
673:(1931-1934)
644:(1925-1929)
389:Performance
224:Mulot AM-20
787:Categories
710:Hermes III
661:Cirrus III
481:References
463:Menasco C4
448:ADC Cirrus
443:Argus As 8
384:Air-cooled
376:Fuel type:
362:Valvetrain
355:Components
346:Dry weight
234:SAI KZ III
214:Miles M.68
179:Auster J-4
79:First run
715:Hermes IV
705:Hermes II
656:Cirrus II
378:70 octane
280:Data from
156:Series II
700:Hermes I
651:Cirrus I
560:Archived
420:See also
254:VEF I-12
152:Series I
339:Height:
327:Length:
283:Lumsden
585:
519:Flight
503:Flight
333:Width:
310:Stroke
229:RWD 21
486:Notes
406:5.8:1
294:Type:
82:1937
51:Type
583:ISBN
301:Bore
104:The
88:The
761:III
638:ADC
146:'s
144:RAF
789::
758:II
745:II
510:^
494:^
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755:I
742:I
727:/
640:/
622:e
615:t
608:v
589:.
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270:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
