词条 | Hirth HM 512 | |||||||||||||||
释义 |
The Hirth HM 512 was a 12-cylinder development of the earlier, 6-cylinder HM 506, produced in the late 1930s. Both were supercharged, inverted V, air-cooled engines.[2] Design and developmentThe HM 512 shared the same bore and stroke (105 mm × 115 mm) and 6:1 compression ratio with the rest of the HM500 series air-cooled engines. Other shared features were Hirth's use of roller bearings in the crankshaft and at both ends of connecting rods. The crankshaft was of typical Hirth multipart design, the 12-cylinders requiring 7 roller bearings. Like the HM 508, the drive was geared down by 1:1.5.[3] Variants
Applications
Specifications (HM 512A-0)Data from {{harvnb|Grey|1972|p=61}} {{pistonspecs| |type=Inverted 60° V-12-cylinder air-cooled piston |bore=105 mm (4.128 in) |stroke=115 mm (4.52 in) |displacement=11.94 L (728.6 cu in) |length=1,507 mm (59.33 in) |diameter= |width=680 mm (26.87 in) |height= 853 mm (33.58 in) |weight= 270 kg (595 lbs) |valvetrain= |supercharger=Light alloy centrifugal type, driven at 3.86 times crankshaft speed. |turbocharger= |fuelsystem=Supercharger drew through twin Pallas 65VH2 carburetters with automatic mixture control and equipped for inverted flight. One Bosch double magneto with automatic advance. |fueltype= |oilsystem=Metered fresh oil to cylinder barrels and crankshaft bearings. Splash lubrication for supercharger and camshaft. Stökicht Sun and planet reduction gear lubricated by high pressure oil. |coolingsystem=Air |power=maximum 270 kW (360 hp) at 3,000 rpm, rated 224 kw (300 hp) at 2,810 rpm, take off 300 kW (400 hp) |specpower= |compression=6.0:1 |fuelcon= |specfuelcon= |oilcon= |power/weight= }}{{aircontent |see also= |related= |similar aircraft= |lists= }} ReferencesNotes1. ^{{harvnb|Gunston|1989|pp=76–7}} 2. ^{{cite web|last1=Pearce|first1=William|title=FKFS Gruppen-Flugmotor A, C, and D|url=https://oldmachinepress.com/2016/03/24/fkfs-gruppen-flugmotor-a-c-and-d/|website=oldmachinepress.com|accessdate=8 May 2016}} 3. ^1 {{harvnb|Grey|1972|p=61}} Bibliography{{Refbegin}}
2 : Hirth aircraft engines|Aircraft piston engines 1930–1939 |
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