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President:

Rear Admiral H. P. NORTON, U. S. Navy.

Secretary-Treasurer:

Commander J. S. EVANS, U. S. Navy.

Council:

Rear Admiral H. P. NORTON, U. S. Navy.
Rear Admiral T. W. KINKAID, U. S. Navy.
Captain ROBERT STOCKER, (C. C.) U. S. Navy.
Commander S. M. ROBINSON, U. S. Navy.
Commander W. W. WHITE, U. S. Navy (Retired).
Captain of Engineers W. M. PRALL, U. S. C. G.
Commander J. S. EVANS, U. S. Navy.

SUBSCRIPTION RATES.

The subscription price of the JOURNAL, postpaid to the United States and possessions, Canada, Cuba and Mexico, is $5.00. Single copies, $1.30. To other countries in the Postal Union, $5.40. Single copies $1.35. All subscriptions are payable in advance.

Make checks, drafts and postal orders payable to

AMERICAN SOCIETY OF NAVAL ENGINEERS.

Advertising rates will be furnished on application.

It is earnestly requested that prompt information be given of changes in address, or of failure to receive the JOURNAL.

Address all communications for the Society to

AMERICAN SOCIETY OF NAVAL ENGINEERS,

Navy Department, Washington, D. C.

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Copyright, 1919, by the AMERICAN SOCIETY OF NAVAL ENGINEERS.

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The Society as a body is not responsible for statements made by individual members.

COUNCIL OF THE SOCIETY

(Under whose supervision this number is published).

Rear Admiral H. P. NORTON, U.S.N.
Captain ROBERT STOCKER, (C.C.) U.S.N.
Commander W. W, WHITE, U.S.N. (Retired).

Rear Admiral T. W. KINKAID, U.S.N.
Commander S. M. ROBINSON, U.S.N.
Capt. of Eng. W. M. PRALL, U.S.C.G.

Commander J. S. EVANS, U.S.N.

GERMAN SUBMARINE ENGINES.

BY LIEUT. COMDR. H. T. SMITH, U. S. N., MEMBER.

In view of the prominence attained by the Diesel Engine in Submarine practice, and of its more recent application to an increasing degree in commercial practice, the following brief description of a German Submarine engine obtained from inspection of a number of these vessels is thought will be of interest to the service. The German answer to many questions which have puzzled our designers and in many cases which are still open questions may be found in these engines. Prominent points in this answer are: The four-stroke cycle; air injection; air starting and reversing; high revolutions and piston speed; oil-cooled pistons; extreme rigidity; stroke-bore ratio close to 1.0 or less; and the application of six cylinders to powers up to 1,750 B.H.P. The following table shows the general characteristics of the machinery installation of thirtysix submarines inspected.

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U-19

U-53

U-55

U-67

U-79

U-101

U-108

U-112

U-114

U-117

U-119

U-120

U-122

U-124

U-125

U-135

M. A. N.

2

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Yes 1912

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In addition, this vessel has charging engines as follows:

16

Designed for one charging engine, but not installed:

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U-141

M. A N. 2

4 6 1,750 380 Yes

Yes

1917

In addition, this vessel has one charging engine, as follows:

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