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Boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers arranged on that side of the housing facing ahead. In the rear edge of the underwater housing, a rudder blade is mounted for pivoting about a vertical rudder axis.

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Boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers arranged on that side of the housing facing ahead. In the rear edge of the underwater housing, a rudder blade is mounted for pivoting about a vertical rudder axis. position

Boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers arranged on that side of the housing facing ahead. In the rear edge of the underwater housing, a rudder blade is mounted for pivoting about a vertical rudder axis. position in planar alignment with each of said lens and said counterbalance and a user adjustable position where said nosepiece is approximately 90° out of phase with said lens. 3. The optical device of claim 1 wherein said nosepiece is generally made from resilient material for actively engaging the bridge of the wearer's nose. 4. The optical device of claim 1 wherein said nosepiece defines a channel for accepting said support bar for rotation therein, said channel further provided with detents for locking at a desired position. 5. The optical device of claim 1 wherein said lens is selectively rotatable about said supporting bar at least between a stored position in planar alignment with each of said lens and said counter balance and a user adjustable position where said nosepiece is approximately 90° out of phase with said lens. 6. The optical device of claim 1 wherein said counterbalance is mounted on said support bar to be freely and independently adjustable from said lens for maintaining balance. 7. The optical device of claim 1 wherein said counter balance is a second lens substantially identical to said lens. 8. The optical device of claim 7, wherein said second lens is substantially identical to said lens and has a different optical strength. 9. The optical device of claim 1 wherein said supporting bar has one elongated flat planar surface such that said bar has a D-shaped cross-section. 10. The optical device of claim 9 wherein said flat surface is positioned facing the wearer.