# MH 32 airfoil

> What is the MH 32 airfoil used for?

- 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/mh32-airfoil/ · JSON: https://xemstudio.com/api/geometry?object=mh32-airfoil · Plain text: https://xemstudio.com/objects/mh32-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

- Martin Hepperle designed the MH 32 as a flapped airfoil for F3B and F3E models, intended to run negative flap for speed (MH-AeroTools).
- UIUC tests at Re 200,000-300,000 matched predictions for the upper laminar bucket; at Re above 100,000 drag rises below CL about 0.25, and Stuttgart tests extended useful range below zero lift with flap (MH-AeroTools).
- It remains a reference section: Model Aviation's soaring column compared newer F3J airfoils against the MH32 and SD7037 at Re 100k.

## Sizes

| parameter | value or range | source |
|---|---|---|
| Design use | flapped F3B / F3E | MH-AeroTools |
| UIUC test Re | 200,000 and 300,000 | MH-AeroTools |
| Stuttgart (IAG) test Re | 100,000 and 200,000; flap -3, 0, 5, 10 deg | MH-AeroTools |
| Lower bucket limit (Re > 1e5) | CL about 0.25 | MH-AeroTools |
| LE geometry sensitivity | 0.25% chord deviation shifted bucket ~0.1-0.2 CL | MH-AeroTools |
| Coordinates source | MH-AeroTools airfoil pages | MH-AeroTools |

## Where the files are

- MH-AeroTools (M. Hepperle): [MH 32: Some Wind Tunnel Results](https://mh-aerotools.de/airfoils/mh32exp.htm) — web — Publisher's page; dimensions are facts
- Model Aviation (AMA): [Radio Control Soaring column, July 2002](https://library.modelaviation.com/article/rc-aerobatics-25) — web — Publisher's page; dimensions are facts

## Questions

**Does MH 32 need flaps?**

It was designed as a flapped section, using negative flap for speed runs (MH-AeroTools).

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