Didi Cruise-Mini
Radius Chine Plywood Mini Cruiser

Didi Cruise-Mini radius chine plywood Mini-Transat boat plans

Fast minimum cruiser

~ Based on Didi Mini

~ Simpler cruising rig

~ Optional Lifting keel for gunkholing

~ More comfortable interior

~ Heads compartment

~ Fast coastal mini cruiser

~ Round the buoys racer

~ Flickr Album

~ Project at Northwest School of Wooden Boatbuilding



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Since we introduced the Didi Mini we have received repeated requests for a cruising version, particularly with shallow water capability. This variation is intended to satisfy that need.

Construction is the same as for the standard Didi Mini, with some cruiser-oriented modifications. First, we have transplanted the lifting keel of the Didi 26 trailer sailer into the hull. This keel has a glass covered hardwood foil and lead beavertail ballast bulb for efficiency. It is lifted with a tackle inside the box and a winch on the cabintop. The keel casing fits neatly between the two parts of the plywood double backbone in the saloon and stiffens the hull by tying the hull and deck together.

We have used the keel casing as a division to introduce an enclosed heads compartment just aft of the mast. This can be fitted with a Porta-Potti or a small marine toilet. A simplified version of the Didi Mini fixed keel is also included in the design package, for those who don't want the lifting keel feature and the limitations that it imposes on the interior of the boat. Those who do not want the enclosed heads can build the standard Didi Mini saloon or build a navigation station in this area.

Forward of the mast, the whole forecabin is turned into a large double berth, comfortable when at anchor. In the saloon, the settees double as quarter berths for sleeping at sea. We have added a box step across the interior between the settees, for stowage and as a battery location.

The cabin roof has been lifted by 100mm (4") to give a bit more headroom. It also allows the cabin structure to give better protection to the cockpit from waves that may come on board when sailing hard. The cockpit protection has been further improved by extending the cabin sides and roof aft to form a dodger over the forward end of the cockpit. To compensate for seat length lost to the longer cabin structure, the stepped aft deck has been replaced by a deck that continues to the transom on one level.

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. The lifting keel is also operated with the cabintop winch.

Drawings for the Didi Cruise-Mini include full size Mylar patterns of the backbone, bulbs, rudders and daggerboards. Optional full size Mylar patterns for the bulkheads are also available.

Pre-cut kits are not yet available for this version but that should change soon.

Click for material list or drawing list.

Didi Cruise-Mini radius chine plywood Mini-Transat boat plans

Didi Cruise-Mini radius chine plywood Mini-Transat boat plans


LOA 6.50m (21'4")

LWL 6.45m (21'2")

Beam 3.00m (9'10")

0.8m/1.6m (2' 8"/5' 3")lifting
2.00m (6' 7") fixed

Displ light
1000kg (2204lb) lifting
850kg (1873lb) fixed

Displ half load
1300kg (2865lb) lifting
1150kg (2535lb) fixed

Ballast 435kg (960lb) lifting
320kg (705lb) fixed

Waterplane area 8.75sq.m (94sq.ft)

Immersion rate 90kg/cm (504lb/inch)

Wetted surface 12sq.m (129sq.ft)

Sail area (main + jib) 29.35sq.m (316sq.ft)

Sail Area/Wetted Surface 2.45

Sail Area/Displ 24.9

Displ/length 135

Prismatic coef .54

Block coef .44

Fineness coef .67

Righting Moment @ 30 deg 835kgm (6040ft.lb)

Righting Moment @ 60 deg 1060kgm (7667ft.lb)

Righting Moment @ 90 deg 540kgm (3905ft.lb)

IG 8.62m (28'4")

ISP 8.97mm (29'5")

J 2.585m (8'6")

P 9.20m (30'2")

E 3.25m (10'8")

Mainsail 19.02sq.m (205sq.ft)

Solent Jib 10.33sq.m (111sq.ft)

150% Genoa 16.67sq.m (179sq.ft)

This design is dimensioned in both metric and imperial measurement systems.


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This page was updated 30 July 2018

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