Author Topic: Aircraft carriers and spy satellites  (Read 77069 times)

Offline Zed_Noir

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Re: Aircraft carriers and spy satellites
« Reply #160 on: 10/09/2023 11:31 pm »
<snip>
Despite their size, the carrier is possibly the fastest ship in the carrier group. Top speed is classified, but they have long been rumored to be a few knots faster than their escorts.
Not true. Modern USN nuclear carriers have a maximum sustain speed of about 30 knots.

While the escorts usually can sustain speed above 30 knots. However going beyond the cruising speed of about 24 knots increases fuel consumption drastically. From using a couple of jet turbines at partial power to 4 jet turbines at full power. They can't sustain high speed for very long.

The additional wear and tear on the propulsion machinery from high speed travel uses up the escorts' finite run time before they have to be overhaul.

Additional factroid - the escorts can not deploy their towed sonar array and the their bow sonar is less effective while travelling faster than cruising speed.
 
 

Online Blackstar

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Re: Aircraft carriers and spy satellites
« Reply #161 on: 10/11/2023 01:28 pm »

Online Blackstar

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Re: Aircraft carriers and spy satellites
« Reply #162 on: 10/11/2023 02:43 pm »
This is obviously not a satellite photo, but you can compare it to earlier satellite photos up-thread. This is a recent photo of the Russian carrier Kuznetsov. The ship is still undergoing refit. There is good reason to believe that this refit will last many more years. Russian shipyards are unable to produce or refit ships on a reasonable schedule. This ship should have been scrapped.
« Last Edit: 10/11/2023 02:43 pm by Blackstar »

Online Blackstar

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Re: Aircraft carriers and spy satellites
« Reply #163 on: 10/23/2023 04:23 pm »
Sentinel-2 image of the aircraft carrier USS Gerald Ford in the Eastern Mediterranean today, Oct 23, 2023.
Around 140 km west of Cyprus.
Coordinates: 34.80690, 30.72891

« Last Edit: 10/23/2023 04:44 pm by Blackstar »

Online JAFO

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Re: Aircraft carriers and spy satellites
« Reply #164 on: 10/24/2023 12:18 am »
USN is not in much better shape in terms of shipyards and dry docks. Between 30-40% of our attack subs are waiting for work, and the only west coast dry dock that can fit a carrier was just shut down over seismic concerns.

https://www.gao.gov/products/gao-23-106067

https://www.heritage.org/defense/commentary/navy-dry-dock-closures-make-bad-problem-worse

Even coming up with a firm plan to fix the problem is years away.
« Last Edit: 10/24/2023 12:22 am by JAFO »
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Re: Aircraft carriers and spy satellites
« Reply #165 on: 10/25/2023 02:10 am »
« Last Edit: 11/17/2023 01:31 am by Blackstar »

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Re: Aircraft carriers and spy satellites
« Reply #166 on: 11/15/2023 02:01 am »
New photos of China's third aircraft carrier under construction. Question about a new structure visible nearby. Speculation that maybe they are planning a launching ceremony.


https://chinapower.csis.org/analysis/china-naval-modernization-jiangnan-hudong-zhonghua-shipyard/

https://chinapower.csis.org/china-type-003-fujian-aircraft-carrier/

« Last Edit: 11/22/2023 07:54 pm by Blackstar »

Online Blackstar

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Re: Aircraft carriers and spy satellites
« Reply #167 on: 11/22/2023 12:55 pm »
Interesting development. Iran appears to be converting a merchant ship to an aircraft carrier. It has a ski jump:



https://x.com/mhmiranusa/status/1786756880338985287

« Last Edit: 05/19/2024 02:41 am by Blackstar »

Offline Speedyhaste

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Re: Aircraft carriers and spy satellites
« Reply #168 on: 11/22/2023 12:58 pm »
There's two.

They are actually Iranin Expeditionary Ships. One is called IRIS Shahid Roudaki and the 2nd IRIS Makran

A couple of links;

https://en.wikipedia.org/wiki/IRIS_Shahid_Roudaki
https://en.wikipedia.org/wiki/IRIS_Makran

I can't remember which, but one of them has been as far as Rio De Janeiro.
« Last Edit: 11/22/2023 01:02 pm by Speedyhaste »

Offline Zed_Noir

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Re: Aircraft carriers and spy satellites
« Reply #169 on: 11/22/2023 02:03 pm »
Interesting development. Iran appears to be converting a merchant ship to an aircraft carrier. It has a ski jump:
The ship appears to be too small to operated crewed aircraft. So the ski jump is probably for small prop powered remote operated aircraft. Something around the size of a MQ-1 Predator drone.

Offline Emmettvonbrown

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Re: Aircraft carriers and spy satellites
« Reply #170 on: 11/22/2023 02:19 pm »
It is one intriguing development in recent years. Drones, because they are slow, unmanned, and cheap enough, may get some (unexpected) navies into the naval airpower game.

Takes Turkey, for example: they are building a big LPH amphib ship, but they are also putting a catapult on it for drones. Seems the chinese are doing that, too, on their most recent amphibs.

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Re: Aircraft carriers and spy satellites
« Reply #171 on: 11/24/2023 12:32 pm »
The dock in front of the carrier was photographed on 11-24. There is speculation that they may be testing the front catapult by shooting stuff off of it into the basin.

Offline Zed_Noir

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Re: Aircraft carriers and spy satellites
« Reply #172 on: 11/24/2023 03:49 pm »
The dock in front of the carrier was photographed on 11-24. There is speculation that they may be testing the front catapult by shooting stuff off of it into the basin.
It is only a partial test, if at that. The catapult system should be tested with an operational mass (preferably an aircraft) catapulted off the carrier. While the carrier is underway at the highest speed possible into the wind.

The objective is to get the maximum possible takeoff weight for the aircraft being catapulted off the carrier. It have implications for the tactical radius of the aircraft along with weapons load that can be carried.


Offline Speedyhaste

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Re: Aircraft carriers and spy satellites
« Reply #173 on: 11/24/2023 06:24 pm »
The dock in front of the carrier was photographed on 11-24. There is speculation that they may be testing the front catapult by shooting stuff off of it into the basin.
It is only a partial test, if at that. The catapult system should be tested with an operational mass (preferably an aircraft) catapulted off the carrier. While the carrier is underway at the highest speed possible into the wind.

The objective is to get the maximum possible takeoff weight for the aircraft being catapulted off the carrier. It have implications for the tactical radius of the aircraft along with weapons load that can be carried.

HAT's are always carried out before SAT's.

That's Harbour Acceptance Trials and Sea Acceptance Trials.

HAT's are a gentle build up and a basic check on systems to make sure they will work satisfactorily enough to get to sea.

SAT's push the operation of the equipment up a level but even then SAT's don't always push the equipment to 100%. That's saved for other trials, training and war.

Online Blackstar

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Re: Aircraft carriers and spy satellites
« Reply #174 on: 11/26/2023 02:06 pm »
This is China's catapult test facility. The object there used in tests has now been spotted on the deck of their new carrier.

Clues like this indicate where the ship is in its construction.

And somebody just got video of one of the tests.

https://www.navalnews.com/naval-news/2023/11/chinese-aircraft-carrier-fujian-commences-catapult-testing/

Update: Added some reported photos of the catapult test device on the flight deck. Something similar has been spotted in satellite photos of the land-based test facility.

Updated update: Added another ground-level photo of the ship. I don't think we have seen such an image before. All of this attests to the value of satellites. It has been satellites that have provided most of the initial information on this ship construction.
« Last Edit: 11/28/2023 11:27 pm by Blackstar »

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Re: Aircraft carriers and spy satellites
« Reply #175 on: 11/27/2023 12:31 pm »
"The photo taken by the reconnaissance satellite at 10:01:10 showed the nuclear carrier Carl Vinson of the US Navy, which is anchored at the military port in Ryongho-dong, Nam-gu of Pusan City."


Update: I should add some details here. North Korea is claiming that its new reconnaissance satellite photographed the Carl Vinson. This appears to be a reasonable claim to make, because other satellites also photographed the Carl Vinson there and the time matches when the satellite flew over that location. Whether or not the NKs actually did that, we don't know. They have not released images.
« Last Edit: 11/27/2023 01:48 pm by Blackstar »

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Re: Aircraft carriers and spy satellites
« Reply #176 on: 11/27/2023 12:34 pm »
USS Saratoga:
« Last Edit: 11/27/2023 12:35 pm by Blackstar »

Offline Emmettvonbrown

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Re: Aircraft carriers and spy satellites
« Reply #177 on: 11/27/2023 06:15 pm »
So they managed to get a picture of USS Carl Vinson ? this mean their spysat has at least a 300 m ground resolution. Very impressive achievement ! (half joking. Don't take that comment too seriously)

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Re: Aircraft carriers and spy satellites
« Reply #178 on: 12/04/2023 06:38 pm »
USS Bataan, although not an aircraft carrier, has a large flight deck and deployed aircraft.

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Re: Aircraft carriers and spy satellites
« Reply #179 on: 12/04/2023 06:40 pm »
Also not an aircraft carrier, but I just came across these on Twitter and thought they are so cool I should share. The big one is a Typhoon class submarine. They were in drydock in 2018 and that's when the images were taken.

Strong "Hunt for Red October" vibes, huh?

All the Typhoons have been retired now.

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