Abstract: The invention detects gas turbine bleed valve position discordances. The invention derives a modified exhaust gas temperature derivative as the predictive criteria in conjunction with a control logic to determine bleed valve position discordances that may indicate a mechanical failure in a valve, or in the control means for a valve.

Abstract: A bicycle drive mechanism which converts linear or elliptical reciprocating motion of the bicycle's pedals to rotary motion of the spindle and the wheels. The mechanism uses a simplified Cardan gear arrangement. There are two arms which rotate in opposite directions to each other. One of the arms is attached to the spindle and the other arm is rotatably connected to the first arm. The pedal is on the opposite end of the second arm from the first arm. The rotation of the two arms relative to each other is achieved through a planetary gear system. Thus the pedals define a linear or elliptical reciprocating path depending on the length of the second arm while imparting rotary motion to the spindle.