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Lifting strakes and spray rails

What do lifting strakes do? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio

Also called: lifting strakes, spray rails, hull strakes, boat strakes, strakes planing, rc boat strakes, spray strakes, running strakes

Exact dimensions. True size, with no printing tolerance added.

sizes
1 in table

Notes

  • 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.

Lifting strakes and spray rails size chart

parametervalue or rangesource
Effecthigher running attitude, more top speedBoat Blurb

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Boat BlurbWhere is a chine on a boat and what does it do?webPublisher'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

lifting-strakes-hulldeep v hull, 585 × 181 mm, deadrise 22° (sections illustrative, scale to your boat)STEP · STL
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Plain text: sheet.txt · JSON: /api/geometry?object=lifting-strakes

Lifting strakes and spray rails, isometric render of a generated part
Render of lifting-strakes-hull from the free STEP; not to scale.

Fits with

Deep-V hull, isometric render of a generated part
Deep-V hull6 sizes★ 1 file
Modified-V (semi-V) hull, isometric render of a generated part
Modified-V (semi-V) hull2 sizes★ 1 file
Flat-bottom hull, isometric render of a generated part
Flat-bottom hull1 sizes★ 1 file
Cathedral (tri-hull), isometric render of a generated part
Cathedral (tri-hull)2 sizes★ 1 file
Tunnel hull (tunnel catamaran), isometric render of a generated part
Tunnel hull (tunnel catamaran)4 sizes★ 1 file
Three-point hydroplane, isometric render of a generated part
Three-point hydroplane4 sizes★ 1 file

Questions

Any downside?

Added weight and wetted surface (Boat Blurb).