Fluidyne manifold for 1/2 in copper U-tube legs — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/fluidyne-manifold-half-inch/  (CC BY 4.0)
Basis: West's fluidyne; sockets at 1/2 in copper tube OD Ø15.88 (fit: socket); port at the 4 mm OD tube
Catalog version: 2026-10-20

Sizes: see table below
- The top of the fluidyne's displacer U-tube: a 90 × 24 × 24 block with 4 mm vertical-edge radii.
- An 8 × 8 gas passage 60 long joins the gas spaces above them.
- A Ø4 port from the passage out through one side takes the 4 mm tuning line (fit: press), which sets the phase.

parameter  value
block  90 × 24 × 24
sockets  2 × Ø15.88 × 16, 60 apart
gas passage  8 × 8 × 60
tuning port  Ø4

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Fluidyne engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Fluidyne
- C. D. West: Liquid Piston Stirling Engines (1983) — book, reports (OSTI) — reference / US Gov reports public domain [verify license at link] — https://www.osti.gov/search/semantic:fluidyne
- 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/fluidyne-manifold-half-inch/index.json
API: https://xemstudio.com/api/geometry?object=fluidyne-manifold-half-inch