Geometric pitch determining device

A device used in determining the geometric pitch of an accurately formed propeller disposed horizontally or vertically having a hub portion with a center of rotation and having a blade extending radially outwardly from said hub portion with a pressure surface thereon, said device comprising:

• level means, said level means including a first axis, said level means operative for indicating when said first axis is disposed in a horizontal plane, said device having support means for supporting said level means thereupon, said support means including at least first and second engagement means for operatively engaging said pressure surface, first and second of said engagement means lying in a first predetermined plane which is oblique to and intersected by said first axis at a first predetermined angle, said first predetermined angle being such that said first axis is disposed in a horizontal plane with said engagement in operative engagement with said pressure surface only when said device is disposed upon said blade at a first predetermined radial distance from said center of rotation of said hub portion, said support means including a flat plate member having a plurality of faces and having two opposed parallel side surfaces, said at least first and second engagement means include first and second protuberances extending outwardly from one of said faces, said flat plate member including four faces, and said at least first and second engagement means further include third, fourth, fifth, sixth, seventh and eighth protuberances, a pair of said protuberances extending from each of said faces other than said one of said faces.