MwRYum
Major
If you take the evening or night time session (they got 1 night time session), it wasn't that bad, and I was talking about my recent experience of being there last month...
PLAN Type 035/039/091/092 Submarine Thread
- Thread starter crobato
- Start date
I went there last week but tickets are booked online only and only national ID accepted, not passport like other museums so Chinese citizens only.
Same with Yuan Wang 1 next door.
MwRYum
Major
HKPR typically has the entry permit card, their system accepted it as valid ID for my booking.
Yuan Wang 1 booking made with another app, and they accepted it as valid ID. Though it seems not all sightseeing places accept that as valid ID (as in, to be qualified for senior concession fare, as me and my mom bought the river cruise ticket and found out).
In any case, both Changcheng 191 and Yuan Wang 1 has plenty of quite steep stairs so they're not recommended for seniors and fat/encumbered people.
PLAN appears more comfortable with giving access to foreign personnel (incl in the past to US officials) to its 039 boats. Whereas this will probably only happen with 039A/B/C in a few years time when the type is no longer considered the most modern PLAN SSK.
The sole 092 SSBN, now serving as a moored training ship. Posted by @撒手锏_ on Weibo.
Both the 039/039G, and later 039A/B, are often seen with a pronounced bow up trim when on the surface. Their painted boot top are noticeably slanted downwards to match the trim. Older 033/035 boats don’t seem to exhibit any bow up trim on the surface.
039/039G appears to retain the bow up trim even when underway, but 039A/B seems usually to be ballasted to an even trim when underway.
This slanted trim seem unusual amongst conventional submarines. What is the explanation? Do they simply pump out their torpedo compensation tanks when their are not fully loaded with ammunition, resulting in nose up trim? If so, why did the 033/035 not show the same behavior?
039/039G appears to retain the bow up trim even when underway, but 039A/B seems usually to be ballasted to an even trim when underway.
This slanted trim seem unusual amongst conventional submarines. What is the explanation? Do they simply pump out their torpedo compensation tanks when their are not fully loaded with ammunition, resulting in nose up trim? If so, why did the 033/035 not show the same behavior?
lcloo
Major
According to my sifu, he said "The choice between bow-up or even trim depends on mission requirements, sea conditions, and the submarine's specific design."
As to your question, it is most likely due to submarine's specific design. Other observation may be due to sea conditions or training vs operational deployment.
His complete reply:-
The trim of a submarine on the surface depends on several factors, including its design, operational requirements, and ballast distribution.
1. **Bow-Up Trim**: Some submarines move with a bow-up trim on the surface due to intentional weight distribution or ballast adjustments. This can help reduce drag, improve maneuverability, or prepare for diving operations. Additionally, submarines with a sail (conning tower) positioned toward the bow may naturally trim slightly upward when surfaced.
2. **Even Trim**: Other submarines maintain an even trim to ensure stability and efficient movement on the surface. This is often preferred for long-distance transits, as it minimizes resistance and allows for smoother navigation.
Submarines use **trim tanks** to adjust their longitudinal balance, shifting water between forward and aft tanks to achieve the desired trim. The choice between bow-up or even trim depends on mission requirements, sea conditions, and the submarine's specific design.
Its worth noting there are a fair few pictures also showing 039/G class submarines underway with even trim. So I wouldnt say it is standard for them to be trimmed bow up.
Generally speaking all modern submarines are rather disagreeable sea boats surfaced, as the hulls are highly optimised for underwater speed/low submerged drag, and particular aspects of individual designs may increase that tendency further. Older boats including the Romeo/033/035 series in their "bones" still differed somewhat in that regard, despite being post WW2 designs.
I am speculating here but it may be that the 039 hull design does provide notably improved seakeeping surfaced with the bow trimmed up, and that 039A/B/C, somewhat like Russian Kilo etc do not benefit from any such measures underway, rendering the issue moot.
Generally speaking all modern submarines are rather disagreeable sea boats surfaced, as the hulls are highly optimised for underwater speed/low submerged drag, and particular aspects of individual designs may increase that tendency further. Older boats including the Romeo/033/035 series in their "bones" still differed somewhat in that regard, despite being post WW2 designs.
I am speculating here but it may be that the 039 hull design does provide notably improved seakeeping surfaced with the bow trimmed up, and that 039A/B/C, somewhat like Russian Kilo etc do not benefit from any such measures underway, rendering the issue moot.