The depth of the
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troughs is a function of the rotational angle that
encompasses the requirements of the intake,
compression, expansion and exhaust processes.
Multiple vanes can be used. A working volume occurs
between adjacent vanes, exposed rotor surface, and
inner and outer trough walls. Further improvements
were disclosed by Cherry et al. and included a six-vane
design, sinusoidal cam profile, vane pin and associated
cam follower in the stator, along with the vane and rotor
sealing found on Wankel technology