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The sheet metal parts of the World War I Fokker Eindecker fighters aircraft series, especially around the engine cowl and associated sheet metal, are noted for having a "dragged" form of engine turning entirely covering them. The tool creating the "swirls" was repeatedly moved along a short, irregular path each time while pressed against the ...
In order to use existing tooling, five 250.6 cu in (4.1 L) Chrysler flathead engines (bore 3.4375 in or 87 mm, stroke 4.5 in or 114 mm) [1] were arranged around a central shaft, producing a unique 30-cylinder 21-litre (1,253 cu in) [1] engine in a relatively compact but heavy package.
Alusil as a hypereutectic aluminium-silicon alloy (EN AC-AlSi17Cu4Mg / EN AC-48100 or A390) contains approximately 78% aluminium and 17% silicon. [1] [2] This alloy was theoretically conceived in 1927 by Schweizer & Fehrenbach, [3] of Badener Metall-Waren-Fabrik, [4] but practically created only by Lancia [5] in the same year, for its car engines.
The engine's major components include an aluminum crankcase, two three-cylinder aluminum cylinder heads with integral intake manifolds, and six individual iron cylinder barrels. The #1 cylinder is at the right rear with cylinders 1, 3, and 5 on the right, while #2 is the left rear with cylinders 2, 4, and 6 on the left.
Aluminum-silicon phase diagram. Aluminum forms a eutectic with silicon, which is at 577 °C, with a Si content of 12.5% [7] or 12.6%. [8] Up to 1.65% Si can be dissolved in aluminum at this temperature. However, the solubility decreases rapidly with temperature. At 500 °C it is still 0.8% Si, at 400 °C 0.3% Si and at 250 °C only 0.05% Si.
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The Group 1 engines were the smallest in displacement and outer dimensions, and differed most significantly from the larger Group 2 and Group 3 engines by having only four main bearings (whereas the Group 2 and 3 engines had seven) [1]: 15 and a different firing order (1-5-3-6-2-4, whereas the others are 1-4-2-6-3-5).
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