Lifting strakes and spray rails — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/lifting-strakes/  (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
- Lifting strakes are lengthwise steps on each side of the keel that add small flat surfaces, raising running attitude and top speed at the cost of weight and wetted area (Boat Blurb).
- Spray rails are lengthwise additions that knock spray down before it reaches occupants (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.

parameter  value or range  source
Effect  higher running attitude, more top speed  Boat Blurb

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Boat Blurb: Where is a chine on a boat and what does it do? — web — Publisher's page; dimensions are facts — https://www.boatblurb.com/post/where-is-a-chine-on-a-boat-and-what-does-it-do

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