Three-point hydroplane — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/three-point-hydroplane/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- A three-point hydroplane rides on two forward sponsons and the lower half of its semi-submerged propeller, lifting most of the hull clear of the water (Wikipedia).
- Lift at speed comes from planing forces, not buoyancy. The design set records such as Slo-Mo-Shun IV's 160.323 mph in 1950.
- RC hydro set-up centres on strut angle, tail weight and turn-fin angle (Model Gas Boats).
- Used on: Slo-Mo-Shun IV, Spirit of Australia.
- 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.

parameter  value or range  source
Slo-Mo-Shun IV record  160.323 mph (1950)  Wikipedia
RC strut angle (manufacturer default)  0 deg  Model Gas Boats
Strut shim, 1.75 in strut  0.030 in per 1 deg  Model Gas Boats
RC rudder  90 deg to table unless specified  Model Gas Boats

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Hydroplane (boat) — web — Publisher's page; dimensions are facts — https://en.wikipedia.org/wiki/Hydroplane_(boat)
- Model Gas Boats: Some tips on setting up a hydroplane hull — web — Publisher's page; dimensions are facts — https://modelgasboats.com/magazine/tech-articles-mainmenu-608/369-hydro-setup-tips

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/three-point-hydroplane/index.json
API: https://xemstudio.com/api/geometry?object=three-point-hydroplane