Hi
Now the work is done. For this towfish i used Roberts idea with some modifies.
The ballast ( 2 kg stainless steel ) on the outside off the towfish works also as a careen and a transducherprotector.
The 36m cable ( 3 extension cable EC W30 ) goes trough the tube and is fixed to the end. I hope, if the fish gets caught in the tow, the fixingpoint off the cable brakes first and so its get be possible to draw the fish backward out.
Material
Tube: PVC 50mm x 2,4mm
Plate: Bubble-PVC „Kömacell“
mvh
Rüdiger