Again, the usual disclaimer, Figures marked with a Tilda (~) are my guesstimates. Don't take those numbers literally.
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P77's power to weight ratio is suspiciously close to the French Suffren. Maybe the increasingly frequent exercises with the Suffren class aren't for nothing. If the P77's hull has a similar co-efficient of friction as the Suffren, then the P77's handling characteristics would be somewhat similar to the Suffren.
There is a dearth of data regarding Chinese sub's reactor & propulsion. So, almost everything is an estimate.