All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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222
All About Engines
an internal combustion engine on a boat is its non-
reversibility. It is very important to be able to go
Gasoline
ahead or
astern at
will when
manoeuvr-
ing in a
crowded
waterway,
and in the
ordinary
sense the four-stroke engine
is non-reversible. On a
motor-car there is a com-
plicated system of gearing
for which room is provided
underneath the car, but in
a boat this takes up floor
space which cannot well be
spared. One method of
avoiding it is to use a re-
versible propeller. In this
ingenious device, by merely
pulling a lever, the blades
of the propeller are twisted
round so that, while it still
rotates in the same direc-
tion, it will propel the boat
Fig. 127,-Evinrud. ouf.bo.rd motor either ahead or astern ag
desired. Failing this, the gear box is essential for all
four-stroke engines. A two-stroke engine will run