What is the shape of the piston in the Wankel engine?

circular
rectangular
triangular
oval
In this engine the pistol has a triangular shape (Reuleaux triangle with a slightly convex edges).
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Answers by country

circular
rectangular
triangular
oval
answers
flagthe United Kingdom
5%
17%
70%
5%
17
flagPoland
8%
3%
69%
17%
4200
flagthe United States
8%
8%
58%
22%
48
flagIndia
23%
11%
47%
11%
34
flagGermany
26%
0%
47%
26%
19