 Further rudders were added at the centre of the boat in 1893, which as well as improving stability meant that she remained more level as it dived.The original sixteen pole electric motor designed by Captain Krebs to develop at 200V and 200A was constructed at the Societe des Forges et Chantiers at Le Havre, was 1 metre in diameter and weighed 2 tonnes.It was connected directly to the propellor which rotated at 250 rpm.