Thermoacoustic hot-head shroud: flame shroud and flue for a vertical 2 in tri-clamp core — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/thermoacoustic-hot-shroud/  (CC BY 4.0)
Basis: Bore = ASME BPE 2 in tube OD Ø50.8; positions from the loop layout in tools/gen_ta_family.py; ISO 273 medium clearance for M4
Catalog version: 2026-10-20

Sizes: see table below
- The loop's core stands vertical with its hot exchanger above the thermal buffer tube, hot end up, so the buffer tube does not convect (Backhaus & Swift ran theirs the same way). A torch cannot fire straight up at the middle of a vertical tube, so the shroud does it: a closed band round the tube at the hot exchanger, with a flue that comes down beside the loop to a torch standing on the bench.
- Flame and hot gas go up the Ø35 flue (132.6 mm), into the chamber, round the tube over a 40 mm band (the top 20 mm of the buffer tube, the hot exchanger, the first 10 mm of the regenerator) and out of the vents in the top. No clamp, gasket or jacket is inside the band.
- Two halves split across the tube: the front half carries the flue; one M4 × 25 and nut each side close them on the tube. The end walls are bored at the tube OD.
- What it is made of is the builder's choice; the file is the geometry. It runs at flame temperature.

feature  value
band  40 tall, Ø80 round the tube
flue  Ø40 / Ø35 × 132.6, 100 in front of the tube axis
walls  2.5
vents  8 × Ø6 on r 31.5, 3 × Ø8 over the lobe
bolts  M4 × 25 + nut, one each side

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- J. Acoust. Soc. Am. (S. Backhaus, G. W. Swift): A thermoacoustic-Stirling heat engine: Detailed study, JASA 107(6), 3148 (2000): regenerator |Z| 15–30 ρc/A with p and U nearly in phase, thermal buffer tube, inertance and compliance, jet pump against Gedeon streaming — PDF — journal article; numbers cited [verify license at link] — https://sites.science.oregonstate.edu/~hetheriw/energy/topics/doc/thermo/heat_eng/Stirling_engine/thermoacoustic-Stirling.heat.engine.detailed.study.j.acous.soc.2000.pdf
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/thermoacoustic-hot-shroud/index.json
API: https://xemstudio.com/api/geometry?object=thermoacoustic-hot-shroud