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Fluidyne manifold for 1/2 in copper U-tube legs
What joins the two legs of a fluidyne liquid-piston Stirling engine? · Hardware · basis: West's fluidyne; sockets at 1/2 in copper tube OD Ø15.88 (fit: socket); port at the 4 mm OD tube
Long Earth Society build part. The water-piston demonstrator. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 4 in table
Notes
- 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.
Sizes
| parameter | value |
|---|---|
| block | 90 × 24 × 24 |
| sockets | 2 × Ø15.88 × 16, 60 apart |
| gas passage | 8 × 8 × 60 |
| tuning port | Ø4 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| leg sockets | Ø15.88 | 1/2 in copper tube OD | socket | all |
| tuning / side port | Ø4 | 4 mm OD tube | press | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Fluidyne engine | web | CC BY-SA 4.0 (text) |
| C. D. West | Liquid Piston Stirling Engines (1983) | book, reports (OSTI) | reference / US Gov reports public domain verify |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| fluidyne-manifold-2x-1-2in-copper | fluidyne displacer manifold: two Ø15.88 sockets 60 mm apart joined by a gas passage, Ø4 tuning port for 4 mm OD tube | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=fluidyne-manifold-half-inch
How it fits
Goes in or on
Copper pipe, 1/4 to 2 inch1/2 in legs in the Ø15.88 socketsConnects to
Silicone tube 1 × 3 to 10 × 14 mm4 mm tuning line in the Ø4 port
Fluidyne output-column tee, 1/2 intuning line to the output columnAlternatives
Borosilicate test tubes, 10×75 to 30×200 mmglass legYou might also need
Questions
What tube size for a fluidyne?
The manifold sockets are Ø15.88.
What sets a fluidyne's frequency?
The U-tube's natural period T = 2π√(L/2g): a 400 mm water column gives about 1.1 Hz.