portion of the cylinder 38 as the prior art design of sc1 does the piston and ram are integral and of a common round diameter the new design differs from the sc3 in that the ram 40 is directed upwardly and then filled with pressurized air through ports 52 as shown in fig6 once the bottom set of rings clears the exhaust ports 54 air is introduced into the first exhaust ports 54 with enough pressure to equalize through the ports 46 48 the air does not start to build up in the cylinder 38 until pressure is up and down to the piston 40 passes down below the first exhaust port 54 the piston 40 does not bind on the way up since fluid can vent through upper vents 66 in reservoir area 33 access 44 provides a piston lock 45 when installed such as for transport to hold the piston 40 in the down position unlike prior art designs this design has an air inlet 32 above the outlet ports 54 which cannot be achieved with the prior art sc3 design as the inlet is at a bottom of the piston cylinder in that design this design can also provide a constant inner diameter of the cylinder 38 from top of the anvil 56 to the inlet 32 and from inlet 32 to the top 58 in the preferred embodiment the rated striking energy is 15 000 pounds other designs may be.