New post-swirl stator released

2017-12-12

Since the beginning of construction works, Seacraft scooters used innovative stator system, inspired by jet engine construction. All propellers work cause torque effect- natural consequence of it’s rotating action, what causes water stream to swirl, and creates turning force on scooter handle what increases diver’s fatigue.

Our system interacts with propeller slipstream, changing it’s swirl to net thrust- and ejects more uniform water collumn- what increases maneuverability and decreases silting when moving close to fine-sediments bottom.

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.