# Deep-V hull

> What is a deep-V hull and how much deadrise does it have?

- 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/deep-v-hull/ · JSON: https://xemstudio.com/api/geometry?object=deep-v-hull · Plain text: https://xemstudio.com/objects/deep-v-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

- Deadrise is the angle between the bottom and horizontal on each side of the keel. Deep-V hulls run about 21-25 deg at the transom, which slices through chop for a smoother, drier ride (BoatTest).
- The cost is efficiency and stability: deep-Vs are harder to push, need more power, are more trim-sensitive and can roll at rest (BoatTest).
- In RC, deep-V monos are preferred for heat racing in rough water; one builder's notes put deep-V at about 21-26 deg and recommend 19-23 deg for heat racing (SV Design).
- Used on: Pro Boat Stealthwake (RC, 20 deg transom).
- 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 |
|---|---|---|
| Deep-V transom deadrise | 21-25 deg (25 rare) | BoatTest |
| Variable deadrise | up to 60 deg forefoot, 30-45 deg amidships | BoatTest |
| RC deep-V range | about 21-26 deg | SV Design (Stealthwake) |
| RC heat-racing sweet spot | 19-23 deg | SV Design (Stealthwake) |
| RC mono CG | 25-35% of length from transom, ~30% target | SV Design (Stealthwake) |
| RC mono CG (racer) | about 28-30% with half tank | Model Gas Boats forum |

## Where the files are

- BoatTest: [To Deep-V or Not to Deep-V](https://boattest.com/view-news/6472_To-Deep-V-or-Not-to-Deep-V) — web — Publisher's page; dimensions are facts
- SV Design: [Pro Boat Stealthwake upgrades info (Feb 2022)](https://myplace.frontier.com/~sv_design/Pro%20Boat%20Stealthwakes%20Upgrades%20Info%20SVC_Feb-2022.pdf) — web — Publisher's page; dimensions are facts
- Model Gas Boats forum: [Need help setting up a mono for the first time](https://www.modelgasboats.com/forum/13-ask-the-editors-discuss-articles-general-boat-questions/21138-need-help-setting-up-a-mono-for-the-first-time) — web — Publisher's page; dimensions are facts

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

Index: https://xemstudio.com/files/hardware/deep-v-hull/index.json · license: https://xemstudio.com/files/hardware/deep-v-hull/LICENSE.md

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

## Questions

**Why does a deep-V use more power?**

More deadrise means less lift per wetted area, so it is harder to push (BoatTest).

## Fits with

- [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/)
- [Stepped hull](https://xemstudio.com/objects/stepped-hull/)