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Eppler E387 airfoil
Why is the Eppler 387 a benchmark airfoil? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Also called: e387, eppler 387, e387 coordinates, e387 dat, low reynolds airfoil benchmark, e387 rc glider, eppler airfoil, laminar separation bubble airfoil
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 3 in table
Notes
- The Eppler 387 was tested by NASA Langley in the Low-Turbulence Pressure Tunnel at chord Reynolds numbers from 60,000 to 460,000 (NASA TM-4062), making it a standard benchmark for low-Re (model-aircraft) airfoil behaviour.
- The NASA tests used oil-flow visualisation to locate laminar separation and turbulent reattachment, the laminar bubble that dominates model-scale airfoil drag (NASA TM-4062).
Eppler E387 airfoil size chart
| parameter | value or range | source |
|---|---|---|
| NASA test Re range | 60,000-460,000 | NASA TM-4062 |
| NASA test Mach range | 0.03-0.13 | NASA TM-4062 |
| Coordinates source | NASA TM-4062 | NASA TM-4062 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| NASA Langley (McGhee, Walker & Millard) | Experimental Results for the Eppler 387 Airfoil at Low Reynolds Numbers in the LTPT, NASA TM-4062 (1988) | web | Publisher's page; dimensions are facts |
Xem scan
File coming
No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=eppler-e387-airfoil
Questions
What Reynolds numbers does E387 data cover?
NASA's LTPT tests ran 60,000 to 460,000 (TM-4062).