{
 "object": "thermoacoustic-burner-drum",
 "license": "CC BY 4.0, Xem Studio",
 "les": "https://longearthsociety.com/engineering/",
 "files": [
  {
   "name": "drum-ring-lower",
   "step": "/files/hardware/thermoacoustic-burner-drum/drum-ring-lower.step",
   "stl": "/files/hardware/thermoacoustic-burner-drum/drum-ring-lower.stl",
   "note": "ring drum lower half: Ø256 × 22.5, walls 2.5, three Ø66 tube holes on r 80, Ø40 / Ø35 flue 480.1 down from the centre, 3 tabs"
  },
  {
   "name": "drum-ring-upper",
   "step": "/files/hardware/thermoacoustic-burner-drum/drum-ring-upper.step",
   "stl": "/files/hardware/thermoacoustic-burner-drum/drum-ring-upper.stl",
   "note": "ring drum upper half: three Ø66 tube holes, 8 × Ø8 and Ø12 vents over the centre, 3 tabs"
  },
  {
   "name": "drum-single-lower",
   "step": "/files/hardware/thermoacoustic-burner-drum/drum-single-lower.step",
   "stl": "/files/hardware/thermoacoustic-burner-drum/drum-single-lower.stl",
   "note": "single drum lower half: Ø130 centred 22 in front of the tube, Ø66 tube hole, flue 403.8 down at y 64"
  },
  {
   "name": "drum-single-upper",
   "step": "/files/hardware/thermoacoustic-burner-drum/drum-single-upper.step",
   "stl": "/files/hardware/thermoacoustic-burner-drum/drum-single-upper.stl",
   "note": "single drum upper half: tube hole, vents over the flue"
  }
 ]
}