R 21 is just the continuation of development form One Sails standard last year R 20 model and it is still all-purpose, all-round sail, for “regular” fit Finn sailor weight of 92-100 kg. Generally, it is just a marginally more powerful but as well bit more twisted in very top section.
Custom made luff curve can be easily adapted to masts with different characteristics. However, the optimal F/A mast band ranges from 114-118 mm in the middle with 12 kg of the load.
It is designed to be more “forgiving” and easy to trim with nicely twisted leech profile.
Full 3-Radial cut, made of Dimension Polyant Black Technora ODL 04 fabrics with 0.75/1.00 mill film.

Mainsail R 21 Plus
This sail is right choice for bit heavier sailors (100 + KG) or sailors who are aiming for extra power in medium wind range conditions. This Sail is up to 0.35 % deeper than R21 model with leach profile bit closer and less twisted. But it is still very sensitive on Cunningham trim and is easy to de-power and control.
It is made only in Dimension Polyant Black Technora ODL 04 fabrics with 0.75/1.00 mill film and 3-Radial cut.

Mainsail LM 21
LM 21 model is Design for light up to medium winds (up to 12 KTS TWS). It comes out as result of synergy of One sails best designs as 672 and experience in past and from latest LM models as LM 18,19,20.
It is made of DP PM02 (white polyester) fabrics and in 3-radial cut construction. If you are looking for peak performance up to 10 KTS TWS and downwind then it is right choice! Cross over is usually from 10 up to 14 kts TWS.
It is extremely easy to trim and de-power when needed. As a compromise, an alternative it can be made of ODL Black Technora laminate on request.