01
Rig type
Select your mast configuration
02
Max righting moment
Type a value or pick a standard band — preferred over displacement
kNm
or select a standard value
03
Boom height above deck (XBH)
Deck to underside of boom at the mast
XBH = deck to underside of boom at the mast
04
Gas spring
Holds the boom up when the sail is lowered
05
Gas spring reach (E)
The foot of the mainsail — measured along the boom from tack (mast) to clew (end of boom)
m
06
How do you use your boat?
This determines the recommended gas spring strength