Airboat Propellers
This Sensenich airboat propeller shows characteristics of its non-aviation usage.   Notice the broad, flattened blade and squared-off tips.  The aerodynamic design favors a high drag design that is useful for slowing an airboat but undesirable for an airplane.
Sensenich and Banks-Maxwell.
Common Manufacturers:
Identification Help:
Sensenich airboat website information
Stamped numbers seem to be most common as diameter X pitch, for instance "72LXL-40".
Many of these were designed for use with automotive, as well as aircraft, engines.

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Go to our Wooden Propeller Forum and post your question in the Propeller Identification forum.  (You will need to register with a username first).
 
11/22/04