Page "Wankel engine" Paragraph 34

The problem of clearance for hot rotor apexes passing between the axially closer side housings in the cooler intake lobe areas was dealt with by using an axial rotor pilot, radially inboard of the oils seals plus improved inertia oil cooling of the rotor interior ( C-W patents 3, 261, 542, C. Jones, 5 / 8 / 63, 3, 176, 915, M. Bentele, C. Jones.

A. H. Raye.

7 / 2 / 62 ), and slightly " crowned " apex seals ( Different height in the center and in the extremes of seal ).