The exhaust ports on these three cylinders go into horns that are only about a foot long.
This sound recording was made outdoors, about 300 feet away from the engine.
Find a history book on this engine model at EngineBooks.com.

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<BGSOUND SRC="http://www.old-engine.com/image/engines/soundfiles/fm3.wav" loop="3" alt="FM-60 BGSOUND"><BR>BGSOUND<BR> FM-Y 3cyl. Audio
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Published by Harry F. Matthews ©1995, 1996, 1997, 1998. ALL RIGHTS RESERVED!