{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "list-ta-standing-quarter-wave-2in",
 "name": "Build list: Thermoacoustic standing-wave engine, quarter-wave, propane, 2 in tri-clamp",
 "kind": "list",
 "category": "Stirling engines",
 "group": "Guide",
 "year": null,
 "question": "What parts do I need to build a Thermoacoustic standing-wave engine, quarter-wave, propane, 2 in tri-clamp?",
 "tags": [
  "list",
  "build",
  "thermoacoustic",
  "long earth society",
  "tri-clamp",
  "standing wave",
  "torch",
  "quarter-wave"
 ],
 "aliases": [
  "standing wave thermoacoustic engine tri clamp",
  "propane thermoacoustic engine",
  "closed end hot cup thermoacoustic",
  "quarter-wave thermoacoustic resonator",
  "thermoacoustic engine build list"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": true,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/list-ta-standing-quarter-wave-2in/",
 "sheet_txt": "https://xemstudio.com/objects/list-ta-standing-quarter-wave-2in/sheet.txt",
 "sheet": {
  "basis": "Every part is a free STEP/STL on this site or a standard part with its own page; quantities are the full count, every screw, nut, pin, gasket and clamp; acoustic numbers from the low-amplitude network model in tools/gen_ta_family.py (Rott's equations, Swift).",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A propane-fired standing-wave thermoacoustic engine in 2 in tri-clamp: a plain closed-end hot cup, cold exchanger under an optional water jacket, quarter-wave resonator open at the top.",
   "Numbers: Gas column 896 mm, closed hot end to the open top (λ/4) · 100 Hz at 427 °C (model, with the end correction and the hot cavity) · onset ≈ 209 °C · ≈ 0.31 W radiated from the open end at 3 kPa at the closed end"
  ],
  "table": {
   "columns": [
    "subsystem",
    "object",
    "parts",
    "qty",
    "note"
   ],
   "rows": [
    [
     null,
     "tri-clamp-cups",
     "cup-2in-133.35",
     1,
     "closed hot end: a plain 2 in × 133.35 closed-end spool, no joint and no gasket in the flame"
    ],
    [
     null,
     "thermoacoustic-hot-fin-sleeve",
     "ta-fin-sleeve-2in-16x80",
     1,
     "optional heat exchanger: radial-fin sleeve slid over the closed end; without it the flame heats the bare cup and the engine needs more heat to start"
    ],
    [
     null,
     "set-screws-metric",
     "set-m4x4",
     3,
     "optional: hold the fin sleeve (only with the sleeve)"
    ],
    [
     null,
     "thermoacoustic-bore-spacer",
     "ta-spacer-2in-60",
     1,
     "hot-cavity liner: from the closed end to the hot exchanger"
    ],
    [
     null,
     "thermoacoustic-heat-exchanger",
     "heat-exchanger-hot-2in",
     1,
     ""
    ],
    [
     null,
     "thermoacoustic-stack",
     "stack-honeycomb-2in-40-c1.5",
     1,
     ""
    ],
    [
     null,
     "thermoacoustic-heat-exchanger",
     "heat-exchanger-cold-2in",
     1,
     "inside the water jacket"
    ],
    [
     null,
     "thermoacoustic-bore-spacer",
     "ta-spacer-2in-8.4",
     1,
     "gasket lip to the cold exchanger"
    ],
    [
     null,
     "thermoacoustic-water-jacket",
     "ta-jacket-half-2in-14",
     2,
     "optional heat exchanger: water jacket over the cold exchanger, 9.35 below the cup's face; or cool that band any way you like (a wet rag works)"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m4x25",
     2,
     "optional: jacket ears (only with the jacket)"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m4",
     2,
     "optional: jacket ears (only with the jacket)"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m4",
     4,
     "hangers"
    ],
    [
     null,
     "tri-clamp-torch-stand",
     "torch-stand-40",
     1,
     "under the cup, 40 below the closed end; the heat source is a propane / butane torch head in the ring"
    ],
    [
     null,
     "set-screws-metric",
     "set-m4x10",
     3,
     "centre the torch head in the ring"
    ],
    [
     null,
     "tri-clamp-spool",
     "tc-spool-2in-18in",
     1,
     "resonator, lower spool (both hangers on it)"
    ],
    [
     null,
     "tri-clamp-spool",
     "tc-spool-2in-12in",
     1,
     "resonator, upper spool, open at the top"
    ],
    [
     null,
     "tri-clamp-gasket",
     "tc-gasket-2in",
     2,
     "Type B"
    ],
    [
     null,
     "tri-clamp-clamps",
     "clamp-half-2in",
     4,
     "2 joints, two halves each"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m5x30",
     4,
     "two per clamp"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m5",
     4,
     "in the clamps' hex traps"
    ],
    [
     null,
     "2020-aluminum-extrusion",
     "2020-200",
     2,
     "rails on the bench"
    ],
    [
     null,
     "2020-aluminum-extrusion",
     "2020-400",
     2,
     "uprights; the hangers bolt to their faces"
    ],
    [
     null,
     "t-slot-corner-brackets",
     "corner-bracket-20",
     4,
     "two per upright, front and back, onto its rail"
    ],
    [
     null,
     "button-head-screws-metric",
     "button-m5x10",
     8,
     "bracket screws, a washer each"
    ],
    [
     null,
     "flat-washers-metric",
     "washer-m5",
     8,
     ""
    ],
    [
     null,
     "drop-in-t-nuts",
     "tnut-dropin-20-m5",
     12,
     "8 per stand for the brackets, 2 per hanger"
    ],
    [
     null,
     "spool-hanger-collars",
     "hanger-2in-tab",
     2,
     "clamps a spool tube; its bar bolts to both uprights"
    ],
    [
     null,
     "spool-hanger-collars",
     "hanger-2in-plain",
     2,
     "the other half of each hanger"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m5x16",
     4,
     "hanger bar into the uprights' T-nuts"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m4x20",
     4,
     "close each hanger on its tube"
    ]
   ]
  }
 },
 "sheet_text": "Build list: Thermoacoustic standing-wave engine, quarter-wave, propane, 2 in tri-clamp — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/list-ta-standing-quarter-wave-2in/  (CC BY 4.0)\nBasis: Every part is a free STEP/STL on this site or a standard part with its own page; quantities are the full count, every screw, nut, pin, gasket and clamp; acoustic numbers from the low-amplitude network model in tools/gen_ta_family.py (Rott's equations, Swift).\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A propane-fired standing-wave thermoacoustic engine in 2 in tri-clamp: a plain closed-end hot cup, cold exchanger under an optional water jacket, quarter-wave resonator open at the top.\n- Numbers: Gas column 896 mm, closed hot end to the open top (λ/4) · 100 Hz at 427 °C (model, with the end correction and the hot cavity) · onset ≈ 209 °C · ≈ 0.31 W radiated from the open end at 3 kPa at the closed end\n\nsubsystem  object  parts  qty  note\nNone  tri-clamp-cups  cup-2in-133.35  1  closed hot end: a plain 2 in × 133.35 closed-end spool, no joint and no gasket in the flame\nNone  thermoacoustic-hot-fin-sleeve  ta-fin-sleeve-2in-16x80  1  optional heat exchanger: radial-fin sleeve slid over the closed end; without it the flame heats the bare cup and the engine needs more heat to start\nNone  set-screws-metric  set-m4x4  3  optional: hold the fin sleeve (only with the sleeve)\nNone  thermoacoustic-bore-spacer  ta-spacer-2in-60  1  hot-cavity liner: from the closed end to the hot exchanger\nNone  thermoacoustic-heat-exchanger  heat-exchanger-hot-2in  1  \nNone  thermoacoustic-stack  stack-honeycomb-2in-40-c1.5  1  \nNone  thermoacoustic-heat-exchanger  heat-exchanger-cold-2in  1  inside the water jacket\nNone  thermoacoustic-bore-spacer  ta-spacer-2in-8.4  1  gasket lip to the cold exchanger\nNone  thermoacoustic-water-jacket  ta-jacket-half-2in-14  2  optional heat exchanger: water jacket over the cold exchanger, 9.35 below the cup's face; or cool that band any way you like (a wet rag works)\nNone  socket-head-cap-screws-metric  shcs-m4x25  2  optional: jacket ears (only with the jacket)\nNone  hex-nuts-metric  nut-m4  2  optional: jacket ears (only with the jacket)\nNone  hex-nuts-metric  nut-m4  4  hangers\nNone  tri-clamp-torch-stand  torch-stand-40  1  under the cup, 40 below the closed end; the heat source is a propane / butane torch head in the ring\nNone  set-screws-metric  set-m4x10  3  centre the torch head in the ring\nNone  tri-clamp-spool  tc-spool-2in-18in  1  resonator, lower spool (both hangers on it)\nNone  tri-clamp-spool  tc-spool-2in-12in  1  resonator, upper spool, open at the top\nNone  tri-clamp-gasket  tc-gasket-2in  2  Type B\nNone  tri-clamp-clamps  clamp-half-2in  4  2 joints, two halves each\nNone  socket-head-cap-screws-metric  shcs-m5x30  4  two per clamp\nNone  hex-nuts-metric  nut-m5  4  in the clamps' hex traps\nNone  2020-aluminum-extrusion  2020-200  2  rails on the bench\nNone  2020-aluminum-extrusion  2020-400  2  uprights; the hangers bolt to their faces\nNone  t-slot-corner-brackets  corner-bracket-20  4  two per upright, front and back, onto its rail\nNone  button-head-screws-metric  button-m5x10  8  bracket screws, a washer each\nNone  flat-washers-metric  washer-m5  8  \nNone  drop-in-t-nuts  tnut-dropin-20-m5  12  8 per stand for the brackets, 2 per hanger\nNone  spool-hanger-collars  hanger-2in-tab  2  clamps a spool tube; its bar bolts to both uprights\nNone  spool-hanger-collars  hanger-2in-plain  2  the other half of each hanger\nNone  socket-head-cap-screws-metric  shcs-m5x16  4  hanger bar into the uprights' T-nuts\nNone  socket-head-cap-screws-metric  shcs-m4x20  4  close each hanger on its tube\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- G. W. Swift (LANL / Acoustical Society of America): Thermoacoustics: A Unifying Perspective for Some Engines and Refrigerators (Rott's equations, screen relations, DeltaEC) — web, software — LANL [verify license at link] — https://www.lanl.gov/org/ddste/aldps/materials-physics-applications/condensed-matter-magnet-science/thermoacoustics/\n- Phys. Rev. (H. Levine, J. Schwinger): On the radiation of sound from an unflanged circular pipe, Phys. Rev. 73, 383 (1948): end correction 0.6133 a — web — journal article; cited [verify license at link] — https://doi.org/10.1103/PhysRev.73.383\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nXem Studio scan: not planned; the official CAD above covers it.\nAPI: https://xemstudio.com/api/geometry?object=list-ta-standing-quarter-wave-2in\n",
 "sources": [
  {
   "publisher": "G. W. Swift (LANL / Acoustical Society of America)",
   "title": "Thermoacoustics: A Unifying Perspective for Some Engines and Refrigerators (Rott's equations, screen relations, DeltaEC)",
   "url": "https://www.lanl.gov/org/ddste/aldps/materials-physics-applications/condensed-matter-magnet-science/thermoacoustics/",
   "formats": [
    "web",
    "software"
   ],
   "license": "LANL",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Phys. Rev. (H. Levine, J. Schwinger)",
   "title": "On the radiation of sound from an unflanged circular pipe, Phys. Rev. 73, 383 (1948): end correction 0.6133 a",
   "url": "https://doi.org/10.1103/PhysRev.73.383",
   "formats": [
    "web"
   ],
   "license": "journal article; cited",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "thermoacoustic-hot-fin-sleeve",
  "tri-clamp-cups",
  "thermoacoustic-water-jacket",
  "thermoacoustic-bore-spacer",
  "thermoacoustic-stack",
  "thermoacoustic-heat-exchanger",
  "tri-clamp-torch-stand",
  "list-thermoacoustic-2in",
  "list-ta-standing-half-wave-2in"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "What frequency does it run at?",
   "a": "30 parts, every one a free STEP/STL on this site; see the table and the build order on this page."
  },
  {
   "q": "How hot does the head need to get?",
   "a": "The model starts it at about 209 °C at the hot exchanger; I expect 50–150 °C more on the real engine."
  },
  {
   "q": "Why a water jacket?",
   "a": "The engine runs on the temperature difference across the stack; the jacket holds the cold exchanger near room temperature while the torch heats the other end."
  },
  {
   "q": "Do I need the fin sleeve and the water jacket?",
   "a": "No. Both are optional heat exchangers on the plain cup; without them the engine needs more heat to start. Any cooling of the band over the cold exchanger works, even a wet rag."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/list-ta-standing-quarter-wave-2in/index.md"
}