Quote:
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Originally Posted by The Bellman
Ascent - Source believed to be Admiral Griffiths - the sub was at 50 ft and 10 knots prior to going to
periscope depth (DW 63 ft) it took he said '' a minute or so .''
Now the 688 DW takes 2 min. 10 secs to do this - she will go from 150 ft to 83 ft in 53 secs and then takes a huge time to level off.
 Could understand if this was periscope deployment and near surface related in order to avoid collision
with surface craft - the transcript reports use of the periscope prior to it breaking the surface to spot 'shadows' etc.
But this slow levelling off phenomena applies at all depth changes.
Quote from Marconi over at Battlefront ''Here're a few musings from a 688/637 class qualified Diving Officer of the Watch:''
''For The Bellman>>The depth change performance in DW isn't unrealistic, it's dreadful.
Take it from a guy with thousands of hours in the center seat. '' 
Bellman.
'Never send to know for whom the bell tolls....' |
well, in fact, The Bellman, it's always the end of the depth change that is slow.
The time when the sub need to equalize the level.
my personnal procedure to PD is this one =>
I order 2/3 when i reach 30m (or 100ft) and always the radar depth (17m on KILO, 54 ft on 688i, 51 on seawolf, 19 on akula)
this way, I'm faster at PD and can use radio/ESM a bit earlier.
the ship will change automatically to 5 knts when close to surface if you ordered 2/3 UNDER the depth of ~ 100ft or 30m.
But the physical model, even if some 'details' could be commented, looks really nice to me.
I imagine stabilizing the level on this kind of heavy ship need some seconds, and the actual process and time of DW looks great to me
500ft to PD in less than 4 mn, 100 ft to PD in 2mn with a 688i if you order 54ft and 2/3
you want to reach the surface staying submerged ?
=> order radar depth and 2/3
you couldn't reach the desired depth faster, but you really can make it longer, so do NOT overcontrol
When doing some big depth change, the changing depth rate is really strong until the stabilization step
but if you change from 10 ft to 10 ft, you will have a very low rate, because the stabilization rate start from the order.
I really think this model is enought great to let it like this and concentrate on other things
