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