89 ft PT-810

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Rank 4 Japan
IJN Mikuma Pack
89 ft PT-810
us_pt810.png
89 ft PT-810
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Description

GarageImage 89 ft PT-810.jpg


The 89 ft PT-810 is a rank V American motor torpedo boat with a battle rating of 3.3 (AB/RB/SB). It was introduced in Update 1.79 "Project X" as part of the fleet closed beta test.

General info

Survivability and armour

Talk about the vehicle's armour. Note the most well-defended and most vulnerable zones, e.g. the ammo magazine. Evaluate the composition of components and assemblies responsible for movement and manoeuvrability. Evaluate the survivability of the primary and secondary armament separately. Don't forget to mention the size of the crew, which plays an important role in fleet mechanics. Tips for preserving survivability should be saved for the "Use in battle" section.

If necessary, use a graphic template to show the most well-protected or most vulnerable points in the armour.

Mobility

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Armament

Primary armament

PT-810 has two 40 mm L/60 Bofors cannons which are a step above previous American torpedo boats. The cannons are arranged with one on the bow and the other on the stern so careful manoeuvring will be required to maintain both on a target. These are most effective when being used against small craft such as torpedo boats, motor gunboats, minesweepers and submarine chasers. In its BR class, it is possible to face larger threats including destroyers which will mostly be unharmed by this gunfire. Aircraft are also excellent targets and can be brought down with accurate fire.

The 40 mm L/60 Bofors Mark 3 cannon has access to three available belts:

  • Universal: AP-T / HEFI-T / AP-T / HEFI-T
  • HE: HEFI-T / HEFI-T / HEFI-T / AP-T
  • AP: AP-T / AP-T / AP-T / HEFI-T

Some of the more heavily armoured gunboats, such as the Russian ones, will be immune to the 40 mm HE shells so it may be wise to be a belt of AP. Against aircraft, HE is the most optimal choice. Otherwise, the Universal belt provides a good balance against most targets.

Secondary armament

For secondary armament, PT-810 has a pair of twin 20 mm Oerlikon Mk.II cannons. These are grouped amidships with one of the mounts being next to the bridge in an elevated position which gives it clear angles of fire, with the other being on the deck just behind the bridge. They can serve as closer range anti-aircraft defenses as well as targeting small boats that are in close proximity. The range on these cannons is limited, so be aware that their use will be restricted to close quarters combat.

The 20 mm Oerlikon Mk.II cannon has access to three available belts:

  • Universal: HEF-T / HEF-I / AP-T
  • HE: HEF-T / HEF-I / AP-T / HEF-I
  • AP: AP-T / AP-T / AP-T / HEF-I

The Universal or HE belts are generally the most effective choices for the 20 mm Oerlikons, as anything that has substantial armour will be able to defeat even the 20 mm AP shells. The HE belts will also give the best effectiveness against aircraft.

Anti-aircraft armament

An important part of the ship’s armament responsible for air raid defense. Anti-aircraft armament is defined by the weapon chosen with the control Select anti-aircraft weapons. Talk about the ship’s anti-air cannons and machine guns, the number of guns and their positions, their effective range, and about their overall effectiveness – including against surface targets.

If there is no anti-aircraft artillery, remove this section.

Torpedo armament

Main article: Mk.16 (533 mm)

While the torpedoes on the PT-810 may be smaller than previous torpedo boats, they are very dangerous and can be highly effective if used correctly. The 21" (53.3 cm) Mark 16 is a high-performance torpedo with short-range but excellent speed. While the distance travelled is only 6,400 meters they have a speed of 46 knots (85 km/h) which is only slightly slower than some other small craft. In addition, the warhead is formed out of 572 kg of Torpex which gives it a TNT equivalence of 915.2 kg. This is nearly as destructive as the most powerful Japanese torpedo, the Type 93 Model 3. Due to the restricted range, and no modification to increase it at the expense of speed, this makes the Mark 16 an ambush torpedo. If the torpedoes are used carefully and aimed properly, it is possible to take out multiple large vessels with a single salvo.

Special armament

Main article: Mk 2 (81 mm)

PT-810 has a dedicated 81 mm Mark 2 mortar on the starboard (right) side just aside the bridge. This can either be aimed manually by selecting it or it will fire automatically. The mortar fires the M43A1 HE shell only, and as it is a mortar the shell has an extremely ballistic arc with a very low muzzle velocity (254 m/s) which makes targeting difficult.

Usage in battles

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Modules

Tier Seakeeping Unsinkability Firepower
I Dry-Docking Tool Set 40 mm HE clips 20 mm HE Anti-Air Armament Targeting
II Rudder Replacement Fire Protection System Smokescreen 40 mm AP clips 20 mm AP Auxiliary Armament Targeting
III Propeller Replacement Depth Charges Primary Armament Targeting
IV Engine Maintenance New Pumps Artillery Support

Pros and cons

Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in the bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - they have a substitution in the form of softer "inadequate", "effective".

Pros:

Cons:

History

PT-810 was one of four experimental PT boats built in 1945, named PT-809 through PT-812. All four of the ships were built with an aluminum hull, but they used different methods of construction;  PT-810 used a combination of rivets and welding. PT-810 was powered by four Packard W-100 gasoline engines - rated at 2,500 hp each - driving four shafts. A maximum speed in excess of 40 knots could be attained. The displacement was 90 tons, the length was 89 feet, the beam was 21 feet 1 inch, and the draft was 5 feet 9 inches.

PT-810 had an armament of two single-mounted 40 mm guns, two twin 20 mm mounts (total of four guns), and one 81 mm mortar. Additionally, there were plans for the provision of four 21 inch torpedoes, but they seem to not have ever been equipped. The two twin 20 mm mounts were placed so that they could both fire on each broadside, a decision that was influenced by the success of similar arrangements on World War 2 Elco 80-foot motor torpedo boats. The PT-810 was fitted with an SPS-5 surface-search radar upon completion.

PT-810 was laid down by Bath Iron Works in Bath, ME, on 1 December 1948. It was launched on 2 June 1950 and completed on 24 November 1951, entering service soon after. Her first commanding officer (CO) was LTJG Robert Beveridge. PT-810 was later commanded by LT Franklin Joyce. PT-810 was used for testing and training purposes, often being seen with PT-811 and the other prototypes, and never saw action or combat of any sort. It was struck from the Naval Register on 1 November 1959. On 21 December 1961, the ship was reinstated on the Naval Register and reclassified as Fast Patrol Craft PTF-1. It was sunk as a target ship off of Vietnam on 1 August 1965.

From Devblog

The PT-810 was one of four experimental boats built in [1951] with various armaments, but with an identical powertrain. She is a rather large patrol torpedo boat with a draft displacement of 90 tons. The craft was designed to be equipped with armaments of several types at once. The first, of course, was torpedoes: four torpedo tubes with Mk 16 torpedoes were located along the vessel’s sides. In the stern, the engineers placed two depth charge launchers. They also didn’t skimp on artillery armament: the experience of real-life battles had resulted in some significant corrections to the requirements for patrol boats. Two single Bofors 40 mm guns were placed in rotating turrets in the bow and stern of the boat. Two twin Oerlikon 20mm guns were mounted on the bridge and above the engine compartment. As if this wasn't enough, the boat was also equipped with an 81 mm Mk 2 Mod 0 mortar with the ability to fire shells not only in a high arc, but also with direct aim.

The vessel was propelled by four engines, each putting out 1,200 hp. Thanks to the boat’s small mass, these engines gave her an excellent speed of 44 knots (over 80 km/h).

Media

See also

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External links

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Bath Iron Works
Motor Torpedo Boats (PT) 
89’ Experimental PT  89 ft PT-810

USA boats
Motor torpedo boats  58 ft PT-3 · 89 ft PT-810 · 94 ft PT-811 · Elco 77 ft PT-20 · Elco 80 ft PT-103 · Elco 80 ft PT-109 · Elco 80 ft PT-314 · Elco 80 ft PT-556
  Elco 80 ft PT-565 · Higgins 78 ft PT-200 · Higgins 78 ft PT-71 · Higgins 81 ft PT-6
Motor gun boats  80 ft Nasty · Elco 77 ft PT-59 · PGH-2
Motor torpedo gun boats  Asheville (PGM-84) · LCS(L)(3)