Abstract: Inoperability due to solenoid freeze-up, electrical malfunction or human error in a mechanical disconnect system for disconnecting first and second shafts includes a disconnect plunger, a first spring for urging the disconnect plunger toward the first shaft whereby the disconnect plunger causes the first shaft to disengage the second shaft when the disconnect plunger is in contact with the first shaft, a solenoid having an armature and windings and a solenoid plunger coupled to the solenoid armature. A second spring urges the solenoid plunger into engagement with the disconnect plunger to thereby prevent movement of the disconnect plunger into engagement with the first shaft. The solenoid windings are controllably energized to move the solenoid armature such that the solenoid plunger is retracted from the disconnect plunger.

Abstract: An arrow has an arrowhead with fixed cutting blades and extendable blades located adjacent the fixed blades. The blades are mounted on a tubular body having longitudinal slots accommodating the blades. A nose attached to the forward end of the body retains the fixed blades on the body. Pins pivotally connect the extendable blades on the body. A ring releasably holds the extendable blades in the slots.