Abstract: A self-adjusting, variable pitch propeller comprising: a central hub defining a propeller rotation axis; a plurality of blade assemblies symmetrically disposed about the hub, each assembly having a substantially cylindrical segment with a propeller blade fast therewith and defining a leading blade edge, each blade assembly being pivotally attached to the hub adjacent the leading edge of the blade of that assembly, a support means interconnecting each assembly and the hub at a location remote from the pivotal attachment to permit controlled blade pitch adjustment to occur as a function of the magnitude of opposed hydrodynamic and centrifugal forces acting on the assemblies by pivotal movement of each assembly, about its the pivotal attachment, both circumferentially and radially relative to the axis.

Abstract: A kit, an assembly and the combination of these with a boat's stern drive unit for the purpose of extending the propeller rearwardly of the boat to increase the trim height adjustment range and leverage. The kit and the assembly include an extruded spacer and an extension shaft.

Abstract: A torque arm, for a dynamometer defining an axis of rotation, having a first, support, end configured for rigid attachment of the arm to the dynamometer, a second, free, end for engaging a reaction stop, a longitudinal axis, an axis intersecting and perpendicular to the longitudinal axis, the axes intersecting and being perpendicular to the axis of rotation when the arm is attached to the dynamometer and a strain gauge for measuring strain of the arm on the transverse axis whereby the strain measurement is a function of torque applied to the arm by an attached dynamometer about an axis of rotation independent of the distance between the axis of rotation and a reaction stop engaging the second end. A dynamometer assembly comprising a dynamometer and such a torque arm attached to a housing of the dynamometer.

Abstract: A pitch gauge for measuring the pitch of a propeller blade which comprises an engaging portion for insertion into a propeller hub, a scale provided on the engaging portion to measure the depth that the engaging portion is inserted into the propeller hub, and a contacting portion for contacting a blade on the propeller hub which prevents further insertion of the engaging portion when the contacting portion contacts the blade. By inserting the pitch gauge into the propeller hub at two different positions a predetermined rotational angle apart, two axial reference points can be obtained. From the axial reference points and the predetermined rotational distance, the pitch of a propeller blade can be computed.

Abstract: The invention provides improved reed constructions for use in a reed valve assembly suitable for use in the induction porting of two-stroke internal combustion engines. The reeds incorporate improved hinge designs and dual-stage reed arrangements in which both primary and secondary reeds incorporate ports which do not overlap one another to improve flow through the dual-stage reed assembly involved.

Abstract: An automatic variable pitch propeller including a central hub defining an axis of propeller rotation and a plurality of blades connected to and extending from the central hub substantially normal to the axis of rotation, each blade being mounted for rotation about a pitch axis, a cam mechanism to translate centrifugal forces imposed on that blade into a force tending to rotate that blade toward a course pitch, that force being opposed by water pressure tending to decrease blade pitch. The cam mechanism including a cam groove formed in an insert, of a material harder than the blades, in each blade shaft and the propeller being provided with variable minimum and maximum blade pitch stops, resilient bias toward minimum blade pitch and manual a pitch-up shift mechanism.