Dutch AVP Arend: Scenario 1 Exploits

[WEXF]

The decision by Command was to launch a 6th attack against Magwe's oil and refinery assets. Dozens of medium bombers attacked during thunder storms. Despite the weather significant additional damage was done to the oil fields. They had been at 81(220) and now are at 55(246). Over 80% of the oil production fields have been damaged.
A separate squadron of medium bombers attacked the ground troops at Magwe, identifying the 38th Field AA BN. That unit is equipped with around a dozen 75mm T88 AA guns. It is unclear exactly when that unit arrived in Magwe. Given the capability of the T88 AA, Command is satisfied with the outcome of the raids. Three bombers made it back to base but crashed on landing. The pilots survived. One Blenheim IV did not return and the pilot is considered KIA. Pilot and airframe fatigue is growing so it is not clear if yet another strike will be ordered. It is looking like Rangoon will fall within a week or two, so taking out the oil assets at Magwe will become more important.

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A message was received that reported TF 236 progressing toward Perth on chedule with no additional damage to the ships and no improved training numbers for the pilots of 700 Squadron. It will take about another 12 days for TF236 to reach Perth.

[WEXF]

Disturbing news was received reporting the enemy advance on southern Java having taken a solid hold at Loemadjang. The 20th infantry regiment and part of the 48th Division are in the base and likely will be advancing toward Soerabaja. The Dutch defenses in the area are not that strong but may be able to hold out for some time in the nearby mountains of Malang. Dutch submarines were able to destroy 3 landing barges in the region but it is unknown if they were carrying troops. One of the barges was LB-509, a larger barge capable of carrying tanks.

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[BBfanboy]

Until April 1, 1942 the Japanese landing bonus allows their vessels to offload troops and their equipment in one phase. That means if you first learn of their location at the moment they land, any response will find them after they have unloaded the troops. But there may have been supplies on those barges you sank.

[WEXF]

More reports have come in from southern Java. Dutch submarines have destroyed xAK Tsukuba, a small Toho Class cargo ship and 2 more small enemy landing barges, LB-122 and LB 1001. Interestingly, LB-1001 was hit by a torpedo! There are numerous enemy ships in the region including many cruisers and patrol boats.

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[WEXF]

Reports on the repairs at the Perth SY continue to show better than expected progress on both Arend and O23. The progress is exactly the same as in the previous 2 days.
Arend was at 0-41-0 30(73%)=41.1. She is now at 0-40-0 12(29%)=41.4. Arend received a total of 23 repair points this turn compared to the 25 received last turn.

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O23 was at 0-10-0 32(58%)=55.2. She is now at 0-8-0 5(9%)=55.6. O23 received a total of 83 repair points this turn compared to the 84 received last turn.

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There can be little doubt that these ships are receiving repair points from a source or sources other than the Perth SY. The Perth SY should only be able to deliver 30 repair points per turn according to "Ship Repair 101". It seems most likely that the AR in Perth is helping O23.
It would make sense that the AR would be assisting O23 in preference to Arend since the degree of major damage is much closer to the level that the AR could handle alone. I am planning a test next turn to try and see what is happening. The AR and the other "repair ships" at Perth (AS, AD) will be sent to another location. That will leave O23 and Arend in the SY with no repair ships in Perth. It is possible that the port or the naval support in Perth could be helping so we will have to wait to see what happens.
In other news TF 236 is continuing to Perth and is now 63 hexes from port. No additional damage is reported on either ship. Interestingly, PO Caruthers has improved his defensive skill from 42>43. TF236 should reach Perth in another 11 days.

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[BBfanboy]

Does Perth have an RAN BF with NS? Is there a Command HQ in range of Perth?

[WEXF]

Does Perth have an RAN BF with NS? Is there a Command HQ in range of Perth?

The answers are yes and yes.
There is a total of 139 Naval Support. Perth is a level 6 port.
Here are the units in Perth.

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[BBfanboy]

III Australian is a Corps HQ so it would not have any boosting effect to ship repair. The NS from the RAN and Cavite USN BF are likely boosting the repairs a lot.

[WEXF]

III Australian is a Corps HQ so it would not have any boosting effect to ship repair. The NS from the RAN and Cavite USN BF are likely boosting the repairs a lot.

Ship Repair 101 say the following:
"The IRP generated by ports and naval support squads are pooled together and are expended each turn on ships in “pierside mode” or “readiness mode”.
Are you saying that the naval support IRP also is available to ships in "shipyard" mode?
This is also in the guide 101: If these formulas are even close to correct there must be more in play than just "naval support"

Table C: IRP generated by shipyards, naval support squads and crews
(Shipyard size x 10)
(Naval Support Squads/2) minus (Damage/5) for repairing ships in “pierside mode”
(Naval Support Squads/3) minus (Damage/5) for repairing ships docked in “readiness mode”
(Crew Experience/8)

[BBfanboy]

No, I don't think NS can help with shipyard repairs, but if their points explain the difference you have been seeing - I could be wrong.

[WEXF]

No, I don't think NS can help with shipyard repairs, but if their points explain the difference you have been seeing - I could be wrong.

The numbers are saying that the two ships in the SY are receiving a total of around 105 repair points per day.

[WEXF]

Air attacks continued against the oil fields at Magwe. Over 70 bombers were deployed from a variety of bases. Damage inflicted has now left the oil fields at 44(257). Only 11 additional damage was achieved suggesting that there is a diminishing return on the attacks. Since both the oil fields and refinery are now about 85% damaged it looks like command will be focused on finding new targets after the airframes and pilots that have been heavily used in the Magwe attacks have had some rest.

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Much of the conversations at the officer's club focused on the worsening situation near Port Moresby. The Japanese have taken Miline Bay, are advancing troops through the jungle and have a number of TF in the area suggesting that an invasion of Port Moresby will be happening soon.

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[WEXF]

Repairs at the Perth SY continue to be puzzling.
O23 is now at 0-7-0 42(76%)=55.3. She was at 0-8-0 5(9%)=55.6. That means that she received 50 repair points to get to 0-7-0 and an additional 42 towards getting to 0-6-0. That is a total of 92 repair points this turn.
Arend is now at 0-40-0 35(85%)=41.5. She was at 0-40-0 12(29%)=41.5, That means that she received 23 repair points this turn.
Taken together the 2 ships in the shipyard received 115 repair points.
I had sent all of the repair ships that had been in Perth to another port to test whether they were helping in the repairs. These numbers tell us they were not. That leaves only the port and the naval support to be helping the repairs. The SY should only be delivering 30 repair points per turn.
I am totally at a loss to explain what is happening so I have to conclude that there are aspects to the process that are absolutely not covered in the Ship Repair Guide 101 or any of the forum posts that have followed the process.

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Help would be appreciated as long as there is data to support what is being offered.
I think it is best to ignore the "repair points" process and rely only on the "days" shown in the screen.

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[WEXF]

I have been thinking more deeply on what might be happening in the Perth SY. I am wondering if there is an aspect to "ship repair" that has been overlooked? What follows is purely speculation.
I was looking at Section 14.2.1.1 of the manual that deals with "Damage Repair Selection". In that section there is discussion of how repairs are prioritized for attention. The concept of "bands" is used and the levels of damage in each band goes from 90>75>60>45>30>15>8>4>2>1. The higher the band of a type of damage a particular ship falls into the more likely that type of damage will be addressed as a priority.
I am wondering is a similar type of thinking is an explanation for what is happening in the Perth SY?
If we accept all of the restrictions on what sources can provide Repair Points for work being done in shipyards, the Perth SY should be only able to deliver a max of 30 points per day and no other sources would be possible.
Arend had 0-40-0 damage and received 23 repair points. Arend would fall into Band 30-45.
O23 had 0-8-0 damage and received 92 repair points. O23 would fall into Band 4-8.
Both ships were alone in the SY and both were at "normal", so it would seem logical that each ship would get a max of 15 of the 30 repair points.
What if the "repair process" multiplies the number of repair points received by a ship based on the "band" its damage is in? The less damage a ship has the higher the multiplier.
If both Arend and O23 received 15 repair points from the Perth SY:
Arend would need a multiplier of 1.5 to get to the 23 repair points actually received.
O23 would need a multiplier of about 6 to get to the 92 repair points actually received.
Thoughts?

[WEXF]

All the talk in the officer's club focused on the situation in Java where the enemy had just landed at Semarang. There are reports that in addition to one TF containing 6 ships there are two other TF with a total of 11 additional ships. At Banjoewangi large groups of ships and troops have been spotted. It is looking like Java will be lost soon. Hopefully, the Dutch will be able to hold out to the end of May. Time will tell.

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[WEXF]

As Perth started the day of 14May42, LCDR Goerk received a message telling him that TF 236 was continuing to make progress and was now only about 9 days away from Perth. No enemy contact had occurred and neither ship in the TF had developed any damage. The message said that the two pilots had improved some of their air skills. WO Hazard's ASW rating had gone from 37>38. PO Caruthers had improved his Def from 43>44.

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[WEXF]

Results of the repair process over this last day were as expected, although still a bit unclear.
Both Arend and O23 remained the only two ships in the SY. All of the repair ships had been placed into a TF and left Perth.
Arend is now at 0-39-0 20(48%)=41.7. She had been at 0-40-0 35(85)=41.2. Arend received 26 repair points this turn. Last turn she received 23 repair points. All together these results are consistent with last turn.
O23 is now at 0-5-0 23(41%)=56.1. She had been at 0-7-0 42(76%)=55.3. O23 received a total of 91 repair points this turn. Last turn she received 92 repair points. Again, very consistent.
Together Arend and O23 recived a total of 26+91=117 repair points. Last turn they got 115.
Since the SY3 at Perth can only deliver 30 repair points the fact that something else is part of the equation is once again clear.
I offered one possible explanation earlier on this thread. I would appreciate any other explanations.

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[WEXF]

Looking at the screens above you can see that O23 is showing an "X" at Repair Ship. That is because the AR was not disbanded in the port of Perth. AR Castor had been part of TF536 that had left Perth for a day and had just returned to Perth. TF536 was ordered to disband and that allowed O23 to have the option of being repaired either in the Y or by the Repair Ship since the major damage was now just 5.
Going forward O23 will be using the AR and Arend will be alone in the SY. The screen shows that if both ships are in the SY, Arend will need 24 days and O23 3. If O23 is with the AR she will still need only 3 days but Arend will need only 23 days in the SY.

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[WEXF]

Java is in big trouble! Reports have come in detailing the latest intel on enemy landings at Semarang. Five enemy TF containing almost 40 ships of all sizes have assisted in the landings. A large TF containing BB, CA and CL has been spotted off Soerabaja. Time is running out for the remaining Dutch defenders.

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[WEXF]

As the sun rose on May 15, 1942 LCDR Gorek was happy to receive a message telling him that TF236 carrying the float plane for his ship was making progress on its way to Perth. The TF was now only 44 hexes (about 1800 miles) from Perth and had not encountered any enemy ships or sustained any additional mechanical damage. No increases in pilot experience or skill ratings had been reported.

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Checking on the progress of the repairs on AVP Arend also was encouraging as Arend was now at 0-38-0 34 (82%)=41.5. She had been at 0-39-0 20 (48%)=41.7. That means that Arend had received the equivalent of 21 repair points to go from 39>38 damage plus an additional equivalent of 34 RP for a total of the equivalent of 55 RP.

Notice the emphasis on the word "equivalent". I am using that word as we all know that Paragraph 2 of Rule Section 14.2.3.1 on Shipyard Repair says that "Repair Yard repair points are the SY size times 10". That means that Perth with a SY of 3 can only deliver a maximum of 30 SY repair points per day. Clearly the "Repair Manager" is taking the number of repair points provided by the SY and adjusting them by factors that are not specified in the rules but are likely based on what is said in the first sentence of the same rule: "Damaged ships are evaluated for repair on their "tonnage", as well as the extent and "type" pf damage."

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Looking at the numbers for Arend:
The screen says 22 more days in the SY are needed to complete the repairs. Perth can deliver 22x30 repair points or a total of 660. But Arend has 38 points of damage and we know that it takes 41 repair points to repair each point of damage. That means that a total of 38x41=1558 repair points are needed to complete the job. Clearly, the Repair Manager has to take the 660 points generated and convert them to the "equivalent" of 1558 points. (In this calculation I am using some rounded numbers to simplify the posting.)