Thermoacoustic burner drum: one torch heats one or three vertical 2 in tubes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/thermoacoustic-burner-drum/  (CC BY 4.0)
Basis: Hole and tube positions from the engine layouts in tools/gen_ta_power.py; Ø66 holes pass over a 2 in ferrule (Ø64)
Catalog version: 2026-10-20

Sizes: see table below
- A closed drum split across its height: the lower half carries a Ø40 flue straight down to a torch standing on the bench (the hot gas rises up it), the upper half the vents. The tubes pass through Ø66 holes, so each half slides over a 2 in ferrule; the halves join with three M4 × 20 through their tabs.
- Ring engine: one drum Ø256 round all three cores' hot zones, flue at the centre between them. Twin engine: a Ø130 drum with its flue in front of the core.
- Inside height 40: room for the optional fin sleeves. The annulus round each tube at the holes is a designed gap (3.6 mm).
- It runs at flame temperature; what it is made of is the builder's choice.

file  diameter_mm  flue_mm
drum-ring-lower  256.0  480.1
drum-single-lower  130.0  403.8

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, 4 parts): https://xemstudio.com/files/hardware/thermoacoustic-burner-drum/index.json
API: https://xemstudio.com/api/geometry?object=thermoacoustic-burner-drum