This is the 10x5 3-Blade Propeller from Master Aircscrew.

FEATURES: Constructed of glass filled nylon
          Provides greater thrust at lower RPMs
          Accurately balanced
          True scale appearance

INCLUDES: 10x5 3-Blade Propeller from Master Aircscrew

SPECS:    Length: 10" (25cm)
          Pitch: 5" (13cm)
          Hole Diameter: 0.25" (6.4mm)

COMMENTS: Avoid high RPM aerobatic manuevers.
          When converting from two-blade propellers to three-blade, decrease
            diameter by 1" and increase pitch by 1" to find proper three-blade
            size.
          Use only a "chicken stick" or electric starter to start engine, then
            make adjustments from behind engine.
          Keep spectators at least 20ft (6.1m) from and out of the path of a
            rotating propeller.
          To stop engine, cut off fuel supply. Do not stop propeller with hand
            or other object.

                                                                   jxs 11/28/07
                                                                         ir/jxs