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Originally Posted by Kapitan
Also a further note india retrofitted one of thier kilo class submarines with an experimental 7 blade propellor with that and thier superior indian batteries that said kilo hit 27 knots but the cost in battery life went through the roof after half hourish of flank speed the battery was quite litteraly dead.
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Sounds like one of those 40-knot carrier sea stories to me. No matter how much charge the "superior" battery can hold, it can only increase endurance rather than top speed, which is regulated by the motor horsepower. Even if I assume the 7 blade propeller (and 636s already use 7-blade propellers while older Kilos use the 6-blade) has somehow
doubled the effective thrust into the water (unlikely, since improvements in these things are incremental rather than revolutionary and India doesn't exactly have tons of experience in this whole subject of advanced sub propellers), it is unlikely to buy 7 whole knots.