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
flagAustralia
10%
10%
70%
10%
10
flagPoland
8%
3%
69%
17%
4542
flagthe United States
6%
13%
54%
20%
59
flagthe United Kingdom
17%
8%
54%
17%
35
flagGermany
18%
6%
52%
22%
48
flagIndia
24%
8%
46%
15%
45