Editing Wankel engine (section)

====Considering two chambers====

Richard Franz Ansdale, [[Wolf-Dieter Bensinger]] and [[Felix Wankel]] based their analogy on the number of cumulative expansion strokes per shaft revolution. In a Wankel rotary engine, the eccentric shaft must make three full rotations (1080°) per combustion chamber to complete all four phases of a four-stroke engine. Since a Wankel rotary engine has three combustion chambers, all four phases of a four-stroke engine are completed within one full rotation of the eccentric shaft (360°), and one power pulse is produced at each revolution of the shaft.<ref name="Bensinger 1973 p. 65">{{cite book |last1=Bensinger |first1=Wolf-Dieter |title=Rotationskolben-Verbrennungsmotoren |place=Berlin, Heidelberg, New York |date=1973 |isbn=978-3-540-05886-1 |oclc=251737493 |language=de |page=65}}</ref><ref name="Okimoto 2002 pp. 810">{{cite journal |last1=Okimoto |first1=Haruo |title=Der Rotationskolbenmotor Renesis |journal=MTZ - Motortechnische Zeitschrift |publisher=Springer |volume=63 |issue=10 |year=2002 |issn=0024-8525 |doi=10.1007/bf03226650 |pages=810 |language=de}}<br/>&nbsp;&nbsp;&nbsp;{{cite journal |last1=Okimoto |first1=Haruo |title=The Renesis rotary engine |journal=MTZ Worldwide |publisher=Springer |volume=63 |issue=10 |year=2002 |issn=2192-9114 |doi=10.1007/bf03227573 |pages=8}}</ref> This is different from a four-stroke piston engine, which needs to make two full rotations per combustion chamber to complete all four phases of a four-stroke engine. Thus, in a Wankel rotary engine, according to Bensinger, displacement (<math>V_h</math>) is:<ref name="Bensinger 1973 p. 66">{{cite book |last1=Bensinger |first1=Wolf-Dieter |title=Rotationskolben-Verbrennungsmotoren |place=Berlin, Heidelberg, New York |date=1973 |isbn=978-3-540-05886-1 |oclc=251737493 |language=de |page=66}}</ref><ref name="Ansdale Keller 1971 p. 82–83">{{cite book |last1=Ansdale |first1=R.F. |last2=Keller |first2=H. |title=Der Wankelmotor: Konstruktion und Wirkungsweise |place=Stuttgart| publisher=Motorbuch-Verlag |year=1971 |language=de |pages=82–83}}</ref><ref name="Wankel 1964">{{cite journal|last1=Wankel|first1=Felix|title=Die Anzahl der Zylinder und Kammern bei durchsatzgleichen Viertaktmotoren mit Hubkolben und mit Rotationskolben der Trochoidenbauart|journal=MTZ - Motortechnische Zeitschrift|volume=25|issue=12|year=1964|pages=489–494|language=de}}</ref>

:<math>V_h = 2 V_k \cdot i</math>

If power is to be derived from BMEP, the four-stroke engine formula applies:

:<math>P = {p_\text{me} \cdot V_\text{h} \cdot {N \over 2}}</math>