NEW POST-SWIRL STATOR RELEASED

2017-12-12

Since its inception, Seacraft scooters have used an innovative stator system inspired by jet engines. All propeller work causes a torque effect, a natural consequence of its rotating action. The force that causes the water stream to swirl also creates a turning force on the scooter handle which increases diver fatigue.

Our system interacts with the propeller slipstream. By changing its swirl to generate a net thrust it ejects more uniformly in the water column. Not only does this increase maneuverability but it also decreases silting when maneuvering close to a fine-sediment bottom.

Our older aluminum designs utilized a curved flat plate that had been optimized for a speed of 1m/s.

However, with our new design, much higher speeds are obtainable.  The new design uses an under-cambered airfoil that allows for complete elimination of the torque effect in all speed ranges by creating a counterforce that is proportional to the water flow speed.

Construction technology based on fiberglass-reinforced polymers, rather than the older aluminum construction, decreases the total weight of this scooter by 300g. Making it almost neutral in water aids in the underwater scooter dismantling protocols used in the military. At the same propeller RPM, it also increased thrust by 2% compared to the older design. Ready to dive, the redesigned Seacraft Future models weight only 15.9kg.

The new post-swirl stator is fully compatible with older Seacraft DPV’s. Every new scooter comes with it from the factory.

Aluminum construction is still available on special order when extreme mechanical resistance is required.

 
 

 

Fig.1 Flow trajectories without post-swirl stator

Fig.2 Flow trajectories with new post-swirl stator

Our previous alluminium design which was using curved flat plate was optimised for speed of 1m/s.

Due to much higher speeds obtainable with our DPV we redesigned this solution, using under-cambered airfoil, to allow for complete elimination of torque effect, in all speed ranges (created counterforce is proportional to water flow speed).

Special construction technology based on fiberglass reinforced polymers allowed also to decrease the total weight of this element by 300g, and make it almost neutral in water, for easiness of underwater scooter dismantling protocols. It also increased thrust by 2% compared to previous solution, at the same propeller RPM. This makes also Seacraft Future models weight only 15,9kg, ready to dive.

New post-swirl-stator is fully compatibile with older Seacraft units, and every scooter leaving the factory is now equiped with it.

Alluminium construction is still available on special order, when extreme mechanical resistance is required.

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