Abstract: A propeller assembly is provided in which the propeller blades are adjustable both rotatably and longitudinally. Pitch angle of the propeller blades may be adjusted by rotating the blades in the hub of the assembly. The outer diameter of the propeller blades may be adjusted by sliding the shafts of the blades into the hub of the assembly to a desired position and locking the shafts thereat by means of set collars. The hub of this propeller assembly is split providing for disassembly and removal of the entire propeller assembly from the drive shaft without removing inboard or outboard shaft bearings or other components. The entire assembly is specially designed for simplified construction by the average amateur homebuilder or hobbyist using only a hack saw, drill press and grinder. No casting, welding or machining is necessary.

Abstract: Successive samples are taken periodically from a body of liquid with the aid of pressurized fluid serving as both timing medium and sample propellant. Alternative high-pressure and low-pressure paths for the fluid correspond to high-lift and low-lift uses in sampling apparatus adjustable as to interval between successive samples and duration of taking of each sample, as well as convertible between levels of sample lift.

Abstract: An aircraft having a major longitudinal strength structure generally centralized in the vertical mid-plane. Shallow V-shaped wing panels are secured to the longitudinal strength structure, one at the top and one at the bottom to define a rhombic cellular configuration. Control linkages are provided, positioned and connected to act as stays between paired of upper and lower wing panels.