Gnome ,wankel ,and radial engine

- In the Wankel a triangular rotor incorporating acentral ring gear is driven around a fixed pini on within
an oblong chamber.

- The rotory motion is transferred to the drive shaft
   via an Eccentric wheel , that rides in a matching
    bearing in the rotor . The Drive shaft rotates once
   during every Power stroke instead of twice as in
   the Otto cycle.

- The Wankel gives higher power output with fewer
moving parts than the Otto cycle engine,but there
are high mechanical friction on it's component.

Although the Wankel engine represented a major
advance in the search for Rotary engine mechanism
, it was not based on any new principle or Thermo-
dynamic cycle.

The four events of the Four stroke cycle take place
in one rotation of the driving member.

the general profile of the straight working chamber is of epitrochoid form .

The rotor provides three equal working spaces, and clearly an exhaust release will occur each time an apex
seal overruns the leading edge of the exhaust port , that is, three times per revolution of the rotor, and this
exhaust will continue until the following seal reaches the trailing edge of the port.Induction will have commenced
in the same space about 60° of rotor movement earlier.

There are thus three complete four-stroke cycles per revolution of the rotor in different working spaces, but all fired by the same sparking plug as maximum compression is reached.

The stationary shell pinion is fixed in the casing,and the annulus mounted at the centre of the rotor,and carried on needle rollers on the periphery of the shaft eccentric or crank , engages and rolls around the fixed pinion . With 24 and 36 teeth on the pinion and annulus respectively , the main shaft will make three turns for one turn of the rotor, this giving a complete cycle for each revolution of the main shaft .The driving impulses transmitted to the shaft thus correspond to those of a normal two-cylinder and four-stroke engine.

- The cylinders point outward from a central
   crankshaft .

- This configuration was very commonly
   used in aircraft engines.

- The cylinders are connected to thecrankshaft
   with a master-and-articulating-rod assembly.

- One cylinder has a master rod with a direct
attachment to the crankshaft . The remaining
cylinders pin their connecting rods attachments
to rings around the edge of the master rod .