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Project 710-M Class Nuclear Attack Submarine

Greetings Captain, and congratulations on your new command!

While the initial production run of four Project 710 class of submarines was deemed a success by the admiralty, several key areas for improvement were identified. Handling, weaponry, and stealth were deemed as priorities. Advances in Aridistani technology since the Pr.710 was first developed allowed for this new design to be rushed into production. Designated as Project 710-M, this new series of submarines represents a massive leap forward in Aridistani operational capabilities.

This brief document aims to outline the improvements/new capabilities of the Pr.710M. If you need a refresher on any of the Pr.710's original systems, additional documentation has been provided(check the "discussions" tab on this workshop page for guides).

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- Stealth Improvements
While the original piston engine that was mandated by Aridistani parliament was certainly powerful, it left much to be desired in the way of stealth. While this wasn't considered to be much of an issue for the intended role of the Pr.710, operational experience has shown that a quieter submarine is needed. The new turbine engine of the Pr.710-M features a hugely reduced noise signature, making the submarine audible at only 8.6km at 100% throttle and 2.85km at 5% throttle(on small sonar). This is a major improvement over the original Pr.710's detection range of "Yes". For countering active sonar, the Pr.710-M carries 52 dispensable decoys, intended to clutter enemy sonar screens with false contacts.

- Weaponry
One of the most common complaints from crews was the relative helplessness against any sort of airborne ASW(anti-submarine warfare) asset. Regardless of if they were detected or not, the complete inability to engage this type of enemy was damaging to morale. To combat these threats, the Pr.710-M features an extended sail that is loaded with 3 agile short-range missiles.

- Improved Handling
Though the original Pr.710 handling was considered acceptable in testing, it could have been better. Primarily, captains and dive officers alike reported poor balancing on the main ballast tank. Additionally, post-torpedo launch balancing was also insufficient. Rectifying these issues has enabled the Pr.710-M to be capable of keeping depth at only 2kt of forward speed(without using the noisy stationary depth hold)!

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Startup
Propulsion notes:
- When the propulsion motor is OFF, direct drive is enabled. When in direct drive, you CANNOT reverse. Additionally, direct drive throttle can only be controller from the engineer station.

- The turbines can take a bit to accelerate when increasing throttle to high settings.

- When increasing throttle on lower settings(ie. 10% -> 20%), excess boiler pressure will usually cause the turbines to accelerate excessively, after which they'll decelerate to the desired speed.

- It's generally best to only use the propulsion motor when you require fine throttle control(like when docking), as it's nosier than direct drive at low RPMs


Ballast/Diving

Torpedo Firing
Torpedo notes:
- Avoid firing the torpedoes if the bow is pitched upwards when near the surface. This can cause the torpedoes to pop out of the water, making them lose all speed.

Missile firing
Missile notes:
- The missile has an approximate minimum engagement range of 150m and max range of 2km

- When tracking a target with periscope the radar, max missile range against small/midsize targets is approximately 1km due to radar jitter. If you can get the laser designator on target, targets can be hit out to the max range(this can be hard to achieve against moving aerial targets in practice).

- Avoid firing the missiles when either A). Traveling in reverse with the radar mast deployed, or B). Traveling above 40 knots. Firing when doing either one of these things can result in the missiles hitting the submarine and detonating.

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- Nuclear powered
- 62.1 knot top speed
- 8 torpedoes
- 3 VLS missiles
- Terrain following depth hold
- Stationary control motors
- Docking port
- Active sonar decoys
- Full offensive sensor suite
- 1st person friendly

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A list of microcontroller credits can be found here:
https://docs.google.com/document/d/196OEVQFiFVy0W4lxmsSeIYkk7GAhsnVitScjoDAB73g/edit?usp=sharing

Special thanks to the usual members of the Subworks crew for feedback/ideas, Mat/Maniac for helping me cook up the missiles in record time, Squet for the propeller, and everyone who left useful feedback on the original Pr.710. A quiet(ish) Aridissn has been a dream of mine since I basically started building the first one, so to finally have one is cool. I hope you enjoy using this sub as much as I do, thanks!

Pssst. Code for the manual control rod is 1986.