ary 28, 1964.

[11] _Instruction Book for the Packard-Diesel Aircraft Engine_ (Detroit:
Packard Motor Car Company, 1931), p. 3.

[12] _S.A.E. Journal_ (April 1930), vol. 24, no. 4, pp. 431 and 432.

[13] Letter, Richard Totten to National Air Museum, January 28, 1964.

[14] Letter, Hermann I. A. Dorner to National Air Museum, December 16,
1961.

[15] _The National Aeronautic Magazine_ (April 1932), vol. 10, no. 4. p.
18.

[16] _Aviation_ (May 1931), vol. 30, no. 5, p. 281.

[17] _The Packard Diesel Aircraft Engine_, p. 5.

[18] _Instruction Book for the Packard-Diesel Aircraft Engine_, p. 3.

[19] "Test of Packard-Diesel radial air-cooled engine," Navy Department,
Bureau of Aeronautics, Report AEL-335, July 13, 1931, Bu. Aer. Proj.
2265.

[20] _Aviation_ (May 1931), vol. 30, no. 5, p. 281.

[21] Letter, Clarence H. Wiegman to National Air Museum, November 1,
1961.

[22] Letter, Dorner to National Air Museum, January 15, 1962.

[23] Letter, Hugo T. Byttebier to National Air Museum, October 20, 1961.

[24] Letter, Clarence D. Chamberlin to National Air Museum, February 8,
1964.

[25] RUTH NICHOLS, _Wings For Life_ (Philadelphia and New York: J. B.
Lippincott Co., 1957), p. 205.

[26] Letter, Richard Totten to National Air Museum, January 28, 1964.

[27] Letter, Richard Totten to National Air Museum, January 28, 1961.

[28] _Aero Digest_ (February 1931), vol. 18, no. 2, p. 58.

[29] "50-Hour Test of Packard Diesel Aircraft Engine," Packard Motor Car
Company, Detroit, Michigan, serial no. 426, test no. 234-73, February
19, 1930.

[30] Blower in this sense refers to a low-pressure air pump
(supercharger) designed to increase cylinder scavenging efficiency by
blowing out exhaust gasses. In doing this it also increases somewhat the
amount of fresh air introduced into the cylinders. Woolson invented a
2-stroke cycle blown engine; the patent was issued in 1932 (patent
1853714) with rights assigned to the Packard Motor Car Company. (Woolson
himself died in 1930.)

[31] A 2-stroke cycle engine completes 360 deg. of crankshaft rotation in
what it takes a 4-stroke cycle engine 720 deg. to accomplish. A 3-cylinder
two-stroke cycle engine therefore has the same capacity to do work as a
6-cylinder four-stroke cycle engine. For this reason the former type of
engine is both more compact and lighter than the latter type.

The above advantages, plus the increased efficiency of the blown 2-cycle
diesel, are discu