# Planing monohull

> What is a planing 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/planing-hull/ · JSON: https://xemstudio.com/api/geometry?object=planing-hull · Plain text: https://xemstudio.com/objects/planing-hull/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

- A planing hull rises onto the surface at speed so dynamic lift replaces most buoyancy, letting it exceed displacement hull speed (Good Old Boat; Wikipedia, Hydroplane).
- Planing lift comes from the bottom pushing water down; flat pads at the chine add lift to get on plane sooner (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 |
|---|---|---|
| Displacement limit exceeded by | dynamic lift | Good Old Boat |
| Chine flat | about 1-2 in pad | Boat Blurb |

## Where the files are

- Good Old Boat: [Displacement hull speed 101](https://goodoldboat.com/displacement-hull-speed-101/) — web — Publisher's page; dimensions are facts
- Wikipedia: [Hydroplane (boat)](https://en.wikipedia.org/wiki/Hydroplane_(boat)) — web — Publisher's page; dimensions are facts
- 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/planing-hull/index.json · license: https://xemstudio.com/files/hardware/planing-hull/LICENSE.md

- planing-hull-hull: [STEP](https://xemstudio.com/files/hardware/planing-hull/planing-hull-hull.step) · [STL](https://xemstudio.com/files/hardware/planing-hull/planing-hull-hull.stl) — planing monohull hull, 585 × 181 mm, deadrise 20° (sections illustrative, scale to your boat)

## Questions

**Can sailboats plane?**

Most large monohull sailboats are displacement hulls and do not (Good Old Boat).

## 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/)