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were probably used to produce parts of quality comparable to the originals; and that the available

“heavy-industry”

equipment

probably influenced both the design and finished parts which are peculiar to this engine. In short, I am trying to convey the idea that this is undoubtedly a highly dependable, even though not highly developed, piece of equipment; and that it was probably produced under time and tooling limitations which we would consider nearly impossible.

The report is made possible by the graciousness of the Experimental Engineering Section of the Army Air Force Material Center, Wright Field, Ohio, in making the engine available for study. The spirit of cooperation of the personnel of that section in the disclosure of their findings and in the discussion of the subject is also gratefully acknowledged. Much of the detail investigation was carried out with the excellent assistance of the Materials Laboratory and other engineering personnel at the Cincinnati, Ohio, plant of the Wright Aeronautical Corp.

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Type — Radial aircooled Cylinders — 14, 5.5-in. bore x 5.95-in. stroke Cylinder arrangement — Two radial banks of 7 Engine diameter — 47 in. approximately Piston area — 332 sq. in. Displacement — 1970 cu. in. Compression Ratio — 6.6 : 1 Supercharger — Centrifugal, 9.62-in. diameter

impeller Supercharger drive — 8.48 x crankshaft Performance estimates on 95- to 100- octane

fuel based on American standards of service life. Maximum cruise — 600-650 hp. — 2,000 rpm. Rated — 850 hp. — 2,250 rpm. to 8,000 ft. Military rated & Takeoff — 1,050 hp. — 2,500

rpm. to 5,500 ft.

General engine condition (before it crashed) was very good. See Figs. 1, 2, and 3. Evidence would tend to indicate that it had been operated for only a short period since overhaul but that that operation had been satisfactory. Pistons, cylinder barrels, valves, rods, reduction gear, and so on, which are available for inspection are excellent. Parts of the supercharger and accessory drive are mutilated badly enough to make any comments on this section invalid. There is, however, some indication

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   

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