ROTOR ASSEMBLY FOR A ROTARY ENGINE

A rotor housing (46) for an aircraft rotary engine (12) includes a side housing body (82) and a rail (84). The side housing body (82) extends along an axis between and to an inner side (94) and an outer side (96). The side housing body (82) forms a fluid cooling passage (106) and a plurality of ribs (114). The fluid cooling passage (106) extends about the axis at the inner side (94). The plurality of ribs (114) are coincident with and extend into the fluid cooling passage (106). The plurality of ribs (114) are distributed about the fluid cooling passage (106) as an array of ribs (114). The rail (84) is disposed at the plurality of ribs (114). The rail (84) extends about the fluid cooling passage (106). The side housing body (82) and the rail (84) form a plurality of fluid cooling channels (118) connected in fluid communication with the fluid cooling passage (106).