wherein the slide valve is a rotary slide valve of which a rotor is formed by the crankcase and {TAIL ~ a stator} is a ring housing, wherein the crankshaft is stationary in {HEAD ~ operation}, 
wherein the slide valve is a rotary slide valve of which a rotor is formed by the crankcase and { TAIL ~ a stator } is a ring housing , wherein the crankshaft is stationary in { HEAD ~ operation } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH