# Chines and reverse chine

> What does a chine do on a boat hull?

- Category: Boat design › Hull types
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/chines-reverse-chine/ · JSON: https://xemstudio.com/api/geometry?object=chines-reverse-chine · Plain text: https://xemstudio.com/objects/chines-reverse-chine/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/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 chine is where hull sides meet bottom. A small flat pad at the chine (about 1-2 in) adds lift so the boat planes sooner and resists listing on plane (Boat Blurb).
- A reverse chine turns down at the edge to trap water for more lift, allowing a steeper V; chine walk is a side-to-side rolling oscillation (Boat Blurb).
- The file is a reference example built by Xem Studio from the numbers above (Reference RC mono: 585 mm length and 20 deg transom deadrise (SV Design Stealthwake data); 181 mm is an unlabelled width in the same source's deadrise diagram.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

## Sizes

| parameter | value or range | source |
|---|---|---|
| Chine flat width | about 1-2 in | Boat Blurb |

## Where the files are

- Boat Blurb: [Where is a chine on a boat and what does it do?](https://www.boatblurb.com/post/where-is-a-chine-on-a-boat-and-what-does-it-do) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/chines-reverse-chine/index.json · license: https://xemstudio.com/files/hardware/chines-reverse-chine/LICENSE.md

- chines-reverse-chine-hull: [STEP](https://xemstudio.com/files/hardware/chines-reverse-chine/chines-reverse-chine-hull.step) · [STL](https://xemstudio.com/files/hardware/chines-reverse-chine/chines-reverse-chine-hull.stl) — deep v hull, 585 × 181 mm, deadrise 22° (sections illustrative, scale to your boat)

## Questions

**What is chine walk?**

The boat rolls side to side as one chine digs in (Boat Blurb).

## Fits with

- [Deep-V hull](https://xemstudio.com/objects/deep-v-hull/)
- [Modified-V (semi-V) hull](https://xemstudio.com/objects/modified-v-hull/)
- [Flat-bottom hull](https://xemstudio.com/objects/flat-bottom-hull/)
- [Cathedral (tri-hull)](https://xemstudio.com/objects/cathedral-tri-hull/)
- [Tunnel hull (tunnel catamaran)](https://xemstudio.com/objects/tunnel-hull-catamaran/)
- [Three-point hydroplane](https://xemstudio.com/objects/three-point-hydroplane/)