Abstract: A trolling depth controller having a body with a generally delta wing pattern and an air-foil cross section, the primary camber being on the lower surface and the nose being weighted. An upper fin includes a plurality of holes along its rearwardly sloping leading edge for attachment of the towing line. A lower, rearwardly sloped fin also includes a plurality of holes, at least some of which are positioned along a trailing edge for attachment of the towed lure or bait line.

Abstract: A stabilizer for boats, the stabilizer being of generally delta planform, having a positive upper camber and a negative lower camber in chordwise cross section, being mountable upon a propeller post and in adjacent spaced relation from the propeller and adapted to be submerged, the stabilizer providing a lifting force to the stern, a downward force to the bow and a generally stabilizing affect upon the boat to which it is adapted.