- Epoxy/Wood CNC Kit Boats
- DixDesign Stock Plans
- Modernwoodenboat Stock Plans
- Old Style Vessels Projets
- plywood - Okoumè
- Warnish & Antifouling
- Gurit - resine epossidiche e ausiliari
- polyester resins & gelcoats
- Composite Materials
- boat accessories
- mooring & anchoring
- Hull accessories
- deck accessories
- cleats, bealing cleats
- stainless ropes
- U-bolts, Eyebolts, hole plates
- handrails & accessories
- Hooks, Shackles
- chainplates, turnbuckles
- fishing rod holders
- ladders, gangplanks, gangways & accessories
- joints & connections for tubes
- cleats, cam-cleats
- awnings, biminis, hoods & accessories
- Turnbuckles and rigging screws
- ventilation, air inlet
- oars, paddles, rowlocks, boat hooks
- mast & bome accessories
- cabin / interior accessories
- hatches, lockers
- deck & interiors hardware
- water fittings & accessories
- rudder - steering accessories
- water & fuel tanks
- deck accessories
- engine parts
- Volvo Penta spare parts
- cooling systems
- exhaust systems
- engine filters
- engine gears
- engine mounts
- engine control instruments
- steerings & engine remote controls
- cathodic protetion
- Super Offers
Search on blog
Last blog articles
Didi Mini Mk3
marine plywood radius chine - CAD
Racer class Mini Transat 6.50, in marine plywood with round hull with the radius chine method. A reasonably cheap construction to start racing in this ocean class. 1: 1 drawings in Mylar of paramezzale, bulb and rudders in the standard plans. Optional: plans + drawings 1: 1 bulkheads.
topside chine, canting keel or water ballast & fixed keel, twin rudders. Built over permanent bulkheads. Includes Mylar backbone, keel & rudder patterns. Optional bulkhead patterns extra (order first building plans).
Didi Mini Mk3
Radius Chine Plywood Mini 650
Low budget performer
~ Economy of plywood
~ Modern radius chine hull with topside chine
~ Stitch & glue cabintop & topside chine
~ Developed from Didi Mini concept
~ Round bilge from sheet material
~ Amateur or pro builders
~ Fixed or canting keel
~ High performance racing on a tight budget
In the 10 years that we have offered plans for the Didi Mini, we have sold plans for 90 boats. Apart from a redesign of the aft deck and a continual expansion of build options, it has remained the same basic boat sold as the Didi Mini Mk2. Now we introduce a major redesign, as the Didi Mini Mk3. It has some major changes from the earlier versions while retaining the same basic structure and detailing. It remains suitable for amateurs to build economically but performance will step up a notch or two.
Introduced in the Didi Mini Mk3:-
~ Updated hull shape with broader stern and topside chine
~ Extended cabin roof, forming protected cuddy over front of cockpit
~ Easier access between cockpit and interior
~ More power from broader and flatter stern
~ Water ballast of fixed keel version further outboard
~ Bow and stern ballast tanks in canting keel version
~ Tacking daggerboard in canting keel version
~ Redesigned foam flotation, cleaner interior
~ Inboard chainplates for tighter genoa sheeting
~ Larger square-head mainsail
~ Carbon or aluminum spars
Overall, these changes produce a boat that will be more powerful, faster, more weatherly and more comfortable to sail.
Now also added to the drawings (Oct 2018) are twin daggerboards and composite chainplates.
These views show the hull and cabin changes clearly.
Detailing is based on the series of radius chine plywood designs that started with my DIDI 38 "Black Cat", and was followed by the DIDI 34, Didi MG30 and DIDI 26. The underbody has been reworked to allow a topside chine to be added to power-up the aft sections. The chine is formed by stitch & glue methods and fairs into the hull side just forward of the mast, with the bow sections remaining the same as the Didi Mini.
Design principle is simplicity and to the Mini 6.5 Class limits. The design includes options of a fixed keel with conventional port & starboard water ballast tanks or a canting keel with forward daggerboard and bow and stern water ballast tanks. For the fixed keel version the tanks increase sail-carrying power. For the canting keel version the tanks allow the bow to be trimmed down on windward legs for improved windward ability or the stern to be trimmed down for offwind performance in strong winds. The daggerboard can be tacked inside the casing for increased lift. Linked twin rudders are steered by central tiller.
Keels are hollow aluminum fabrications with through-bolted beaver tail ballast bulbs. The fixed keel has optional trim tab. Both keels are supported by the hull structure by means of an internal aluminum box frame. The fixed keel has an integral post to transfer some of the keel loads through to the deck structure.
The sections and waterlines on these views highlight the hull shape.
The deck layout is a fairly conventional 3-winch arrangement. The smaller headsails sheet to the top of the cabin and are led to the cabintop winch. The larger headsails and spinnakers sheet to the cockpit winches. Tweeker lines replace headsail tracks.
Spars can be either carbon for performance or aluminum for reduced cost. If an aluminum mast is used then the ballast bulb must be 10% heavier to maintain stability in the test condition.
Drawings include full size Mylar patterns of the backbone, bulbs, rudders and daggerboard. Optional full size Mylar patterns for the bulkheads are also available. Drawings have been added to the set for composite chainplates and twin daggerboards.
Pre-cut hull, deck and bulkhead kits are available from various suppliers. Click here for supplier contact info. Please clarify with suppliers what is included in their prices.
Click for material list or drawing list of the Didi Mini Mk3.
We continue to sell plans for the Didi Mini alongside the Didi Mini Mk3 because there are builders who still prefer to build the older design.
Figures shown are with carbon spars.
LOA 6.50m (21'4")
LWL 6.45m (21'2")
Beam 3.00m (9'10")
Draft 2.0m (6'7")
Displ to DWL 1050kg (2315lb)
Displ light 865kg (1907lb)
Ballast 320kg (705lb)
Waterplane area 9.32sq.m (100sq.ft)
Immersion rate 96kg/cm (535lb/inch)
Wetted surface N/A
Sail area (main + jib) 41.7sq.m (449sq.ft)
Sail Area/Wetted Surface N/A
Sail Area/Displ 41
Prismatic coef .53
Block coef .34
Fineness coef .67
Righting Moment @ 30 deg: 886kgm (6408ft.lb)
Righting Moment @ 60 deg: 965kgm (6980ft.lb)
Righting Moment @ 90 deg: 670kgm (4846ft.lb)
IG 8.62m (28'4")
ISP 11.62mm (38'1")
J 2.585m (8'6")
P 10.435m (34'4")
E 3.7m (12'2")
Mainsail 31.36sq.m (338sq.ft)
Solent Jib 10.33sq.m (111sq.ft)
150% Genoa 16.67sq.m (179sq.ft)
Marine plywood with excellent resistance and durability performance in conditions of extreme humidity and salinity. Thanks to their unique water resistance, Okoumè marine plywood panels are the ideal choice for carrying out structural projects that require durability performance in a marine environment even in severe conditions. measures 122x250cm...
epoxy/plywood radius chine - CAD Build yourself a performance boat - Economy of plywood - Modern radius chine hull with topside chine - Stitch & glue cabintop & topside chine - Developed from Didi Mini Mk3 concept - Fixed or lifting keel with lead ballast bulb -Twin transom-hung rudders - Round bilge from sheet material - Amateur or pro builders -...
sport dinghy in radius chine - CAD with double trapeze as very high performance skiff or ballasted as sport dinghy with great stability. The economy of marine plywood for a wood / epoxy performance boat. Radius chine hull, cockpit and edge deck. Developed on the Didi Mini Mk3 minitransat concept. With double trapeze as very high performance skiff or...
marine plywood radius chine - CAD Derived from the Didi 26, it retains its characteristics but is more compact and trailerable. With different options: mobile or fixed sailing dinghy, long or short cockpit, inboard or outboard engine, racing or cruising rig. 1: 1 drawings in Mylar of paramezzale, bulb and rudder.1: 1 templates of the optional bulkheads...
marine plywood radius chine - CAD A fast boat for exiting weekends, regattas and short cruises. With different options: mobile or fixed bulb, long or short cockpit, inboard or outboard engine, racing or cruising rig. 1: 1 drawings in Mylar for backbone, bulb and rudder. 1: 1 templates of the optional bulkheads (order the floors first). DWG file for CNC...