Questions and Answers

Issue 4 and Volume 91.

Questions and Answers NOTE—Readers are invited to send in questions, which will be answered in the order received. Names are omitted from questions unless otherwise specified Motor Torque To the Editor: In the march issue of FIRE ENGINEERING, page 111, Question and Answer column, the last sentence in the last paragraph is incorrectly stated. There is a definite mathematical relation between torque and horsepower output of an internal combustion engine. This does not depend upon any gear ratio. A gasoline engine does not produce the same torque output at all speeds and we therefore have the torque of an engine expressed at some definite speed. This speed is taken as the number of revolutions of the crankshaft, within a definite time interval which is customarily one minute. For example, the torque output of an engine would be given as 520 lbs/ft. at 1,700 r.p.m., as shown on the attached curve.…

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