Ab Volvo Penta

Other

Volvo Penta Ab

Kare Jonsson

Benny Hedlund

Oddbjorn Hallenstvedt

Nils-Ake Florander

A propeller drive for boats features a transition cone between the gearbox housing and the propeller hub(s). The propeller hub (that is closest to the gearbox housing) is smaller in cross-sectional dimension than the gearbox housing. The dimension of the front end of the transition cone corresponds to the cross-sectional dimension of the gearbox housing, and the dimension of the rear end of the transition cone corresponds to the cross-section dimension of the (closest) propeller hub. The transition cone has a bulging shoulder between the front and rear ends, the largest peripheral cross-sectional dimension of which is greater than the cross-sectional dimension of the front of the transition cone.

Marine propeller drive

Propeller combination for an aft-mounted boat propeller drive unit with counter-rotating pushing propellers (). The forward propeller () is made with blades () which have blade tips with an outer edge (b) which approaches a straight line. The width of the blade tip is between 40% and 45% of the maximum width of the blade.

Propeller combination for a boat propeller drive having double propellers

Boat propeller drive unit with an underwater housing ( ), which is solidly joined to a boat hull and has pulling propellers ( ) on the forward facing side of the housing. At the aft edge of the underwater housing, a rudder is mounted, comprising a first rudder blade ( ) mounted in the underwater housing and a second rudder blade ( ) mounted on the aft edge of the first rudder blade.

Drive means in a boat

A boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers which are arranged on that side of the housing facing ahead and the blade areas of which are adapted to one another in such a manner that, at least under certain operating conditions, the aft propeller works in a cavity-generating manner whereas the fore propeller works in a cavitation-free manner.

Growing community of inventors

Trollhattan, Sweden

Kare Jonsson