Installation manual

Purse seine hydrophone installation
53
851-165187 / Rev.A
Tilt angle
The tilt angle is a function of net length and depth and may be
estimated as follows:
α = -[arctan (depth/length
*
π)-15_+β]
α = tilt angle
β=angle of heel (to port) after deploying the purse seine to
starboard
The following table gives some examples of recommended tilt
angles for common size pure seines:
Recommended tilt angles
Net length/depth
in meters
250 / 50 350 / 100 650 / 150 850 / 180 1500 / 200 2000 / 200
Recommended
tilt angle *
-- 1 5 _ -- 2 5 _ -- 2 0 _ -- 2 0 _ -- 1 5 _ -- 1 5 _
*The tilt angle should be increased accordingly if the vessel heels after the seine is shot. T ilt
angles of less than --15_ are not recommended.