Frame for the rolling-diaphragm tri-clamp engines: base, wall, hanger and torch-stand mount — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-rd-engine-frame/  (CC BY 4.0)
Basis: Design values; hanger bar hole spacing (78.8) and height from the spool hanger collars on this site; torch-stand hole pattern from the torch stand on this site
Catalog version: 2026-10-20

Sizes: see table below
- One frame for all three rolling-diaphragm engines: the 2 in cup hangs from a spool hanger bolted to the wall, its closed end 40 mm over the torch stand's ring.
- The wall has a window behind the hot end and the optional finned cooler, so the fins clear it and the flame has air.
- The base reaches 300 mm toward +X, under the power head and flywheel on the tee's branch.

feature  value_mm
base  370 × 150 × 8
wall  124 × 10, top z 234.85
hanger holes  x ±39.4, z 226.85
torch stand holes  (±25, 28), M4
cup bottom  93.0

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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/tri-clamp-rd-engine-frame/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-rd-engine-frame