Xem Studiomeasured geometryThermoacoustic standing-wave engine, half-wave, loudspeaker alternator, 2 in tri-clamp
The propane standing-wave engine as a half-wave: closed at both ends, a 40 mm loudspeaker in the top cap as the alternator.
Gas column 747 mm between two closed ends (λ/2) · 242 Hz at 427 °C · onset ≈ 271 °C · ≈ 0.46 W of sound into a matched end load at 3 kPa at the hot end
Exact dimensions. Every part is drawn at true size with no printing tolerance; each part's page lists its mating features and the fit each joint needs, so open those by your process's clearance before making the parts.
28 parts, every one a file here · all STL URLs · Markdown · tick lines as you go (saved in this browser)
| subsystem | object | parts | qty | note | |
|---|---|---|---|---|---|
| None | Thermoacoustic finned hot head | ta-finned-head-2in STEP · STL | 1 | closed hot end, one piece: no joint and no gasket in the flame | |
| None | Thermoacoustic bore spacers and liners f | ta-spacer-2in-60 STEP · STL | 1 | hot-cavity liner: from the closed end to the hot exchanger | |
| None | Thermoacoustic heat exchangers | heat-exchanger-hot-2in STEP · STL | 1 | ||
| None | Thermoacoustic stack for tri-clamp spool | stack-honeycomb-2in-40-c1.5 STEP · STL | 1 | ||
| None | Thermoacoustic heat exchangers | heat-exchanger-cold-2in STEP · STL | 1 | inside the water jacket | |
| None | Thermoacoustic bore spacers and liners f | ta-spacer-2in-8.4 STEP · STL | 1 | gasket lip to the cold exchanger | |
| None | Thermoacoustic water jacket | ta-jacket-half-2in-14 STEP · STL | 2 | water jacket over the cold exchanger, 9.35 below the head face | |
| None | Socket head cap screws | shcs-m4x25 STEP · STL | 2 | jacket ears | |
| None | Hex nuts | nut-m4 STEP · STL | 6 | jacket (2), hangers (4) | |
| None | Torch stand for a horizontal tri-clamp h | torch-stand-40 STEP · STL | 1 | under the head, 40 below the closed end; the heat source is a propane / butane torch head in the ring | |
| None | Set screws (grub screws) | set-m4x10 STEP · STL | 3 | centre the torch head in the ring | |
| None | Tri-clamp spool (two ferrules on a tube) | tc-spool-2in-12in STEP · STL | 2 | resonator: two 12 in spools (both hangers on the lower) | |
| None | Tri-clamp gasket | tc-gasket-2in STEP · STL | 3 | Type B | |
| None | Tri-clamp clamp | clamp-half-2in STEP · STL | 6 | 3 joints, two halves each | |
| None | Socket head cap screws | shcs-m5x30 STEP · STL | 6 | two per clamp | |
| None | Hex nuts | nut-m5 STEP · STL | 6 | in the clamps' hex traps | |
| None | Thermoacoustic driver cap | driver-cap-2in-40mm-speaker STEP · STL | 1 | closes the top: the half-wave's second closed end | |
| None | 40 mm loudspeaker envelope (the speaker | speaker-envelope-40mm STEP · STL | 1 | 40 mm loudspeaker in the cap's socket, cone toward the gas | |
| None | 2020 aluminum extrusion | 2020-200 STEP · STL | 2 | rails on the bench | |
| None | 2020 aluminum extrusion | 2020-400 STEP · STL | 2 | uprights; the hangers bolt to their faces | |
| None | L corner brackets for 20 | corner-bracket-20 STEP · STL | 4 | two per upright, front and back, onto its rail | |
| None | Button head socket screws | button-m5x10 STEP · STL | 8 | bracket screws, a washer each | |
| None | Flat washers | washer-m5 STEP · STL | 8 | ||
| None | Drop-in T-nuts for 20 | tnut-dropin-20-m5 STEP · STL | 12 | 8 per stand for the brackets, 2 per hanger | |
| None | Spool hanger collars | hanger-2in-tab STEP · STL | 2 | clamps a spool tube; its bar bolts to both uprights | |
| None | Spool hanger collars | hanger-2in-plain STEP · STL | 2 | the other half of each hanger | |
| None | Socket head cap screws | shcs-m5x16 STEP · STL | 4 | hanger bar into the uprights' T-nuts | |
| None | Socket head cap screws | shcs-m4x20 STEP · STL | 4 | close each hanger on its tube |
Assembled engine
A propane-fired half-wave standing-wave thermoacoustic engine in 2 in tri-clamp: finned hot head, water jacket, two 12 in spools and a 40 mm loudspeaker cap on top, hung from a 2020 stand; about 99 × 243 × 866 mm.
Assembly STEP (14.8 MB) · STL (5.9 MB) · 93 parts
Build order
- Stand: rails, uprights, brackets; torch stand on the bench at the column axis, ring toward the back.
- Head closed end down: 60 liner, hot exchanger, stack, cold exchanger, 8.4 spacer to the lip, all from the face.
- Water jacket halves on the head 9.35 mm below the face, M4 × 25 each side.
- Type B gasket, 12 in spool, clamp; Type B gasket, 12 in spool, clamp; Type B gasket, driver cap with the speaker, clamp.
- Two hangers on the lower 12 in spool; torch head in the ring.
Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is every part.
JSON: /api/geometry?object=list-ta-standing-half-wave-2in-speaker