Thermoacoustic fin sleeve: clamp-on, 2 in tube, 34 mm (optional) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/thermoacoustic-fin-sleeve/  (CC BY 4.0)
Basis: Bore = 2 in tube OD Ø50.8; length covers the 12 mm hot exchanger with 11 mm each side
Catalog version: 2026-10-20

Sizes: see table below
- Two halves with 24 radial fins each side of the split, clamped round the plain core tube over the hot exchanger with one M4 × 16 and nut each side. The flame gas in the burner drum passes between the fins; the fins conduct into the tube wall, the wall into the slotted hot exchanger inside.
- Optional: the engine is complete without it (the drum then heats the bare tube); with it the tube wall reaches a given temperature with less flame.
- Fits: bore clamps the tube (1 mm split take-up); ear holes M4 clearance.

feature  value
bore  Ø50.8
fins  24 × 1.5 to Ø72
length  34

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Xem Studio: tools/gen_ta_power.py: the network model and every dimension on this page — code — CC BY 4.0 — https://xemstudio.com/
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/thermoacoustic-fin-sleeve/index.json
API: https://xemstudio.com/api/geometry?object=thermoacoustic-fin-sleeve