A: 38.1 cm (15 in)
B: 17.8 cm (7 in)
C: 40.6 cm (16 in)
D: 22.9 cm (9 in)
E: 5.4 cm (2 1/8 in)
F: 8.3 cm (3 1/4 in)
G: 5.9 cm (2 5/16 in)
H: 2.5 cm (1 in)

Edson engineers designed this steerer with the working gear on the forward side of the rudderpost. This feature allows you to install this steering system on a yacht having as little as 5 - 6 in (12.7 cm - 15.2 cm) of space aft of the rudderpost (see "C" dimension in chart), depending on the size of the worm gear.