Youkou-Lili Study Plans Instant Download

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18' 7'' / 5.7


Sail and oar boat inspired from both the Norwegian oselvar and the Swampscott dory

For Youkou-Lili full plans, click HERE

Hull length / waterline 5.70 / 4.57 m   Sail area 10 to 10.6 m²  
Breadth / waterline 1.56 / 1.21 m   Outboard motor No  
Draught 0.18 / 0.94 m   Design category / Crew C3 / D5  
Light weight 240 kg   Building time with kit 480 hours

Drawing       See photo albums

Between Youkou-Lili and me, it is a love story. It is a boat that I have imagined, drawn, and built in my garage, and launched finally in 1985. I wanted an excellent boat both under sail and under oars. Aven, then the reference boat, did not satisfy me with its rowing performances. Youkou-Lili, is inspired both by the Norwegian “faering”, and by the American “Swampscott dory” (flat bottom). Both are excellent rowing boats with good sea-keeping abilities. Originally I intended to make it with timber planks, varnished or oiled. But beside the difficulty of finding good quality large planks, I realised the boat could as well be built with plywood, without making this substitution apparent. The plywood is painted, and this is conforming to the aesthetics of a small traditional boat. Built that way, Youkou-Lili could sail several decades without aging. It met the marshes of Brière, the Erdre river near Nantes, the waters of North and South Brittany, the Iroise sea at the extreme West of France (picture), the Connemara in Ireland, Norwegian lakes and fjords….

I have tried successively the sprit sail sloop rig and the dipping lug, and when I sold the boat, the standing lug sail. I like much the sprit sail, unrecognised and typical of many Northern Europe boats. But after the first years, I have fitted the dipping lug sail (picture). It is a demanding rig. You have to gybe (pass the yard from one side to the other), which can be done within seconds with practice. But it is the best performing traditional rig, due to sail always well apart from the mast. Whether sailing or rowing, Youkou-Lili had always the first place in the sail and oars contests it participated.
The normal crew is 2 or 3, with the ability to take 4 or 5 in sheltered waters.

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Additional Information

Designer Name:
Francois Vivier Architecte Naval
Sail area (Imperial / Metric):
108 ft² / 10 m²
Rig Type:
Keel Type:
Length (range):
16' - 23'11" / 4.88m - 7.29m
18' 7'' / 5.7
Length at Waterline:
14' 12'' / 4.57 m
5' 1'' / 1.56 m
Hull Weight:
200 - 999 lbs / 90.72 - 453.14kg
Estimated Hull Weight:
530 lb / 240 kg
36" / 91.44cm
Unloaded Draft:
3' 1'' / 0.94 m
Weight Capacity:
1000 lb / 450 kg
Primary Material:
Marine Plywood
Method of Construction:
Lapstrake / Clinker
Hull Type:
Hull Shape:
Flat bottom
Power Source:
Human, Wind
Built-in Floatation:
Unit of Measure:
Instruction Manual:
Step-by-Step Instructions
Lofting Required:
Recommended Experience Level:
Designer's Thoughts on Experience Level:
Traditional type, designed for home builders
Boat Type:
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