The design began with a two-aircraft requirement, but planners judged that complement inadequate and increased it to three. Accommodating the larger hangar and its associated superstructure meant canting the island to one side. This kind of asymmetry is particularly undesirable in a submarine because it complicates stability. Even one additional strike aircraft could therefore impose consequences across the entire boat's naval architecture.
Notable Point · 18:24-19:05
Three aircraft forced stability compromises
Increasing the air group from two Seirans to three required an offset superstructure that introduced an unwelcome submarine-stability penalty.