Not as I recall. I Think Bruce Crower invented the six stroke  engine.
  Half gasoline and half steam.
  http://en.wikipedia.org/wiki/Crower_six_stroke

  Paul Lamar

  And the neat part of it was that no cooling system was
  needed.  Producing the steam on the 5th and 6th parts of the cycle
  cooled the engine!

  SD

 Hi  Paul,  That little bit about harnessing the heat via steam and the
 excess heat in a rotary, could not some clever engineer make a extra
 sided rotary and inject water after the exhaust phase and recover plus
 cool down the housing and rotor, just before the the next intake phase.
 I cannot quite get my head around the shape required, but I think that
 may be where the rotary could have the edge, (no valves head gaskets
 ect.), just a thought.
      John Burey.

 You will have to carry distilled water which cost more than
 gasoline :)

 All of these variations work. Pick one you would like
 to use.

 Paul Lamar

Paul,    I am even more confused now, if I thought I was confused
before:-! . It was just a thought! As they say nothing new, what was it
1525 AD, blokes were thinking about these shapes!!:-[

John Burey

Don't be confused. Felix Wankel either tested them or considered
them all over most of his lifetime. His forte was seals.

The current Wankel configuration was chosen for a lot of good reasons.

One of the most important was a thing called max leaning angle.
The WORST angle the seal made with the rotor housing surface.
Sometimes it is 90 degrees when the apex seal is pointing to
top, bottom or one of the rotor housing sides.

 The current Mazda configuration is right
in the middle of the gasoline engine range. No coincidences.
When you look at a current Mazda Wankel engine you are looking at
an optimum Wankel engine design for a compression ratio of 10:1 :)
The 16X and Wankel SuperTech engines have a lower max leaning
angle and a higher compression ratio. As the max leaning angle
comes down the physical size of the engine for a given displacement
goes up. There is no free lunch. In the Wankel engine the hip bone
is connected to the thigh bone and the thigh bone is connected
to the knee bone and there is noting you can do about it :)

Paul Lamar