PLAN Type 035/039/091/092 Submarine Thread


by78

Lieutenant General
Re-posting two lost images...

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palejade

New Member
Registered Member
I noticed a minor change to the Type 039G1. In the photo on the left the vane on the trailing edge of the sail is a little higher than on the other boats. Do we know if this is just on this one boat or are the others to be altered during their refit cycle?

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palejade

New Member
Registered Member
Some magazine scans of the good old 091.

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Good to see these photos. I wonder if you know why one of the boats has a different arrangement of free-flooding/limber holes?
One of them has a series of open oblong slots whereas the others appear to have long continuous lines. Is one an old idea which is being replaced with a new design?
 

Tam

Brigadier
Registered Member
Good to see these photos. I wonder if you know why one of the boats has a different arrangement of free-flooding/limber holes?
One of them has a series of open oblong slots whereas the others appear to have long continuous lines. Is one an old idea which is being replaced with a new design?

401 started with a long line, 402 was also long then 403 went with a line of dotted holes, then went back to a long line in 404 and 405. I think 401 was retrofitted with the short holes sometime after. They are trying to experiment which configuration of sink holes would produce the less noise both hydrodynamically --- water flowing around the holes as the sub moves forward --- as well as the noise as the water is either absorbed and ejected from the ballast tanks when the sub sinks or rises.

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