{
 "object": "power-piston",
 "license": "CC BY 4.0, Xem Studio",
 "les": "https://longearthsociety.com/engineering/",
 "files": [
  {
   "name": "piston-16x14-blank",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-16x14-blank.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-16x14-blank.stl",
   "note": "piston Ø16 (= the liner bore; clearance-seal running fit) × 14: Ø3 rod hole and a Ø3 wrist-pin boss"
  },
  {
   "name": "piston-16x14-trunk",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-16x14-trunk.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-16x14-trunk.stl",
   "note": "trunk piston Ø16 (= the liner bore) × 14: closed 2 mm crown, open skirt, two wrist-pin bosses 7 apart for a 5 mm con-rod's small end, Ø3 wrist pin across the bore 9.6 above the crown face"
  },
  {
   "name": "piston-20x18-blank",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-20x18-blank.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-20x18-blank.stl",
   "note": "piston Ø20 (= the liner bore; clearance-seal running fit) × 18: Ø3 rod hole and a Ø3 wrist-pin boss"
  },
  {
   "name": "piston-20x18-trunk",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-20x18-trunk.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-20x18-trunk.stl",
   "note": "trunk piston Ø20 (= the liner bore) × 18: closed 2 mm crown, open skirt, two wrist-pin bosses 7 apart for a 5 mm con-rod's small end, Ø3 wrist pin across the bore 11.2 above the crown face"
  },
  {
   "name": "piston-25x22-blank",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-25x22-blank.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-25x22-blank.stl",
   "note": "piston Ø25 (= the liner bore; clearance-seal running fit) × 22: Ø3 rod hole and a Ø3 wrist-pin boss"
  },
  {
   "name": "piston-25x22-trunk",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-25x22-trunk.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-25x22-trunk.stl",
   "note": "trunk piston Ø25 (= the liner bore) × 22: closed 2 mm crown, open skirt, two wrist-pin bosses 7 apart for a 5 mm con-rod's small end, Ø3 wrist pin across the bore 12.8 above the crown face"
  },
  {
   "name": "piston-30x27-blank",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-30x27-blank.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-30x27-blank.stl",
   "note": "piston Ø30 (= the liner bore; clearance-seal running fit) × 27: Ø3 rod hole and a Ø3 wrist-pin boss"
  },
  {
   "name": "piston-30x27-trunk",
   "step": "/files/hardware/power-cylinder-piston-crosshead/piston-30x27-trunk.step",
   "stl": "/files/hardware/power-cylinder-piston-crosshead/piston-30x27-trunk.stl",
   "note": "trunk piston Ø30 (= the liner bore) × 27: closed 2 mm crown, open skirt, two wrist-pin bosses 7 apart for a 5 mm con-rod's small end, Ø3 wrist pin across the bore 14.8 above the crown face"
  }
 ]
}