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http://www.ultralightnews.ca/hirth-engines.htm Page 7 of 31
The Ultralight News
Figure 1.3-3
(View of ignition side with installed ignition system)
1.4Description of the cooling system
The 2704 engine has a mechanically operated forced fan cooling system. (Figure 1.4-1).
The fan wheel is installed in the fan housing. It is driven by a flat belt and a pulley that is fixed to the
ignition system?s magnetic flywheel. A stream of cool air generated by the fan is distributed for optimal
cooling to the two cylinders. The hot air stream from the cooling system is blown off to the opposite side of
the engine into the surroundings on the intake side.
Figure 1.4-1 (View of the fan housing and the air conduction cowl)
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