Over the last few week I've been working with Septimanien, to produce a tool for engineers and machinists, as part of his excellent Wolfpack Multitool, both are currently being re-written as an English-language version (the original was in French).
During testing, a stand-alone version of the engine/e-motor version was created, and this same program is also incorporated in the new version of the multi-tool. Personally I find the stand-alone one best for me to use, as it's possible to alt-tab into it and still be able to simultaneously read the battery more easily.
What does it do?
If you enter a desired speed, eg 6.3 knots it will out-put a precise rpm for that speed surfaced on diesels, surfaced on e-motor and submerged on e-motor, as forward movement, or astern. This is very useful when the captain wants to match the convoy's speed for a parallel attack. It also acts as a mechanism for generating battery-reports. I usually do these every 1Kah, or with speed changes, and more frequently when the battery is lower than 5Kah.
The battery report can be copied to clip-board, and you simply paste it into the WP text buffer and hit return. There are check-boxes so you can make a full report, or an abbreviated one. If you align the program time with the ship's clock, at games start then all your reports are expressed in WP time provided you "refresh" the time just before generating the report. Or you can align it with your pc' system time.
Where this comes in useful is for long submerged runs, where you can forecast the distance capable of being travelled at any given e-motor speed, and the endurance of the battery. This can be used used to help plan battery usage to achieve something - or to show that it can't be. It's particularly useful if caught in shallow water and repeatedly evading dc attacks, or making long submerged runs at depth to enter a convoy. It's reasonably intuitive to use, and we've added numbers in white-boxes to help show the sequences. You can also set an rpm, instead if an EOT speed, and generate battery reports based on a non-standard rpm. This remains a beta program, but there are now no known bugs.
Attached are a couple of images showing it's use, and a report as generated.
Septimanien's link to the smaller dedicated engineer/machinist tool is here:
https://drive.google.com/file/d/1JWS...ew?usp=sharing
He or I'll post a link to the full WP Tool which incorporates the above, once Septimanien has finished it.
NB. In the example report, I'd unchecked the "WP time" element to the report. If checked, it would have expresed the WP time of battery exhaustion.
If anyone needs help using this, just post here or contact me on discord.