Production model

J/121

Built by J/Boats

A 40 ft fractional sloop designed by Alan Johnstone, built from 2018. She carries 12 ft 4 in beam, 7 ft 9 in draft and 11,900 lb displacement. Hull form is fin with bulb & a spade rudder.

J/Boats were founded in Rhode Island in 1977 by Rod and Bob Johnstone, and their designs have defined one-design keelboat racing in America ever since. The figures below come from owners who logged work on this boat here.

What building a J/121 actually takes

Medians from the build logs kept on this site, not the designer’s estimate. Nobody has logged this boat here yet, so they are empty until the first builder does.

Build logs

Launched

n/a

Median hours

n/a

Median months

Those medians firm up as more people log this boat.

Builds of this boat

Nobody has logged a J/121 here yet.

If you are building one, yours becomes the reference: the page the next person building this boat finds when they search for it. One photo and one line is a valid first entry.

Start the first log of this boat

Boats like this one

Same type, closest in length.

Model	Builder	LOA
J/122	J/Boats	40′ 0″ (12.19 m)
Catalina 387	Catalina Yachts	39′ 10″ (12.14 m)
First 40	Beneteau	40′ 2″ (12.24 m)
Tartan 40	Tartan	40′ 3″ (12.27 m)
C&C 40	C&C	39′ 8″ (12.09 m)
Hunter 41 DS	Hunter	40′ 4″ (12.29 m)