SOOT IN THE FLUES

By Anna Mae
Published on September 1, 1987
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Hi! to my dear readers and friends I am very happy we have quite
a lot of copy, good stories and information, so I’m hoping it
will make you very happy and I am, for this time, not going to add
anything, but to hope you are having a wonderful summer and I know
there are still a lot of activities going on. Read and enjoy and be
sure you read all the articles and stories and especially the last
letter in the column.

And now for the article…

‘I have been a subscriber to the ALBUM for over 30 years and
this is my first letter. On pages 10 and 11 of the May/June issue,
an article of Mr. Rixmann covers the subject of Drawbar Horsepower.
As a mechanical engineer, I become incensed when others present a
solution to a mathematical problem without any consideration as to
the units used and how they arrived at the answer.’

Although 60 divided by 17 is 3.428, what are the units of 60 ?
Answer: 88 feet x 60 sec/min x 60 min/hr x 1/5280 miles/feet =60
sec-miles/hr. 60 sec-miles/hr x 1/17.5 sec=3.428 miles/hr. Why the
author solved for miles per hour is a puzzle. As stated in the
article, one horsepower=33,000 lb/ft/min. Obviously the units of
12,958 are lb/miles/hr. But now the real puzzle? -375! The author
calls this a ‘constant factor’. Actually its units are
lb-miles-HP/hr!

A simpler and more traditional solution as generally used by the
profession, is 88 ft x 1/17.5 sec x 60 sec/min x 3780 lb x 1/33,000
min-HP/lb =34.56 HP. The foregoing is as important in knowing that
your steam guage reads in pounds/square inch and not pounds/square
foot!’

This letter came from WILLIAM H. RICHARDSON, JR., 540 Mill,
Sheboygan Falls, Wisconsin 53085 and I’m sure the readers that
are into this kind of fractions and statistics will understand.

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