Library › Boat design › Hull types ·
Planing monohull
What is a planing hull? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Also called: planing hull, planing boat, on plane, planing vs displacement, getting on plane, planing speed, rc planing hull, semi planing
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 2 in table
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.
Planing monohull size chart
| 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
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Good Old Boat | Displacement hull speed 101 | web | Publisher's page; dimensions are facts |
| Wikipedia | Hydroplane (boat) | web | Publisher's page; dimensions are facts |
| Boat Blurb | Where is a chine on a boat and what does it do? | web | Publisher's page; dimensions are facts |
Free files
★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
| planing-hull-hull | planing monohull hull, 585 × 181 mm, deadrise 20° (sections illustrative, scale to your boat) | STEP · STL |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=planing-hull

Fits with
Questions
Can sailboats plane?
Most large monohull sailboats are displacement hulls and do not (Good Old Boat).





