# Eppler E387 airfoil

> Why is the Eppler 387 a benchmark airfoil?

- Category: Airfoils › Airfoils
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/eppler-e387-airfoil/ · JSON: https://xemstudio.com/api/geometry?object=eppler-e387-airfoil · Plain text: https://xemstudio.com/objects/eppler-e387-airfoil/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## 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).

## Sizes

| 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

- NASA Langley (McGhee, Walker & Millard): [Experimental Results for the Eppler 387 Airfoil at Low Reynolds Numbers in the LTPT, NASA TM-4062 (1988)](https://ntrs.nasa.gov/citations/19890001471) — web — Publisher's page; dimensions are facts

## Questions

**What Reynolds numbers does E387 data cover?**

NASA's LTPT tests ran 60,000 to 460,000 (TM-4062).

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