Review: Trinity Yachts 122' Sportfish "Mary P"

Dominating the forward quarter, the VIP Suite follows the “underwater” color patterns, and boasts its walk-around, raised queen-size berth. In addition, this room seems to have a “gimme” on the attractive “Deep Sea Dance of the Mermaids” and her salt water denizens. This may be the most comforting cabin for a grand night’s sleep, unless the night run hits a few rogue waves.

As we make note of the “perhaps” situation, let’s take a close-up look into the night panorama of that lucky denizen who won the night-time lottery. Gorgeous! to say the least; if you’re not up all night marvelling at the passers-by.

Without question, Trinity has built a marvellous reputation over many years. This newest Mary P launch presents a highly capable, advanced sport-fishing-cruising-yacht that will undoubtedly attract many followers. Stylish, extremely capable; the size and outfitting of the yacht Mary P allows her to travel where the action is, and to perform as she was designed to do. As the number of sportfishing and cruising members continues to grow, Mary P seems certain to affirm Trinity’s top place in the draw.

Review by YF Publisher Carl Camper

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Specifications:

LOA: 122’ (37.2m)
Beam: 24’ (7m)
Draft: 6’ (1.82m)
Displacement (1/2 load): 162 long tons
Hull: Aluminum hull/superstructure
Class: Full ABS
Fuel: 8,000 USG (3,028 L)
Water: 800 USG ((3,028 L)
Range: 2,000 Miles @13 knots
Top Speed: 25 knots. Trial Load
Cruise: 23 knots approx.
Guests cabins: 8, in 4 staterooms
Crew, cabins: 4, in 2 cabins
Naval Architect: Doug Sharp, Trinity
Interior: Judy Bell Davis
Exterior: Geoffrey van Aller
Power: 2x Cat 3512C
Generators: 2x Northern Lights 80 kW
Bow Thruster: Quantum Hydro 120 hp
Air Conditioning: Marine Air, 30 tons
Paint: Awlgrip
Electrical: 208 volts AC 60Hz
Shorepower: ASEA 75 KvA
Battery Chargers: 3 Mastervolt
Sanitary System: Headhunter Sewage Treatment / 300 gal Holding Tank
Tenders: 19’ Boston Whaler / 12 Person Zodiac Life Rafts
Watermaker : 2 Filtration Concepts
Navigation: (2) Radars w/6’ mast antennas, GPS, VHF, HF/SSB Autopilot, Gyro, Security Monitors, Satellite TV

For more information contact:

Trinity Yachts
13085 Seaway Road
Gulfport, MS 39503
(228) 276-1000
Trinity Yachts

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DETAILS​

What lurks beneath the waterline of Mary P is state of the stabilized art. This boat doesn't simply have motion control, it's got ocean control!

What's this launch tube protruding from the bow? Mary P takes tournament fishing seriously. If you can't raise a bigger fish, then sink the competition! Joking aside, this is forward scanning sonar. Here fishy-fishy! That hole in the bow contains a Quantum QT-120 bow thruster that churns a pair of 4-bladed counter rotating props. To give you a sense of scale, the tube for the thruster is approximately 2 feet in diameter!

Why have the exhaust exit under the hull? A pair of 2550 hp engines expel a lot of air. That same air can be used to create pressure under the hull, which adds lift that can aid in faster planing, as well as an aerated layer aft of the exit that can help offset drag.

Why is this pipe protruding out of the hull? Because it puts a new spin on stability! This is Quantum's MAGLift stabilizer which uses the Magnus Effect to induce roll. Say what? The Magnus effect is the phenomenon whereby fluid passing over a spinning object creates a cyclone of fluid around itself, which results in a force perpendicular to the line of motion. The system is designed to provide roll stabilization between 4 and 15 knots. Above that speed, the rotors return to the retracted position (shown here) to reduce drag. The system utilizes a spinning sheath, like an exterior tube, that rotates with waterflow.

The MAGLift system is particularly useful when traditional fin stabilizers would add too much drag, such as a hi-speed planing hull like Mary P. Think of it as a retractable fin system. The principle behind the MAGLift is elemental. A spinning object moving through a fluid departs from a straight path because of pressure differences that develop as a result of velocity changes above and below a spinning body. For example, when a ball is thrown, the turning ball drags some of the air around with it. The drag of the side of the ball turning into the air (into the direction the ball is travelling) retards the airflow, whereas on the other side the drag speeds up the airflow. Greater pressure on the side where the airflow is slowed down forces the ball in the direction of the low-pressure region on the opposite side, where a relative increase in airflow occurs.

Two 5.5" diameter Aquatech shafts are twisted by a pair of Cat 3512C (2550 hp) engines, reduced by a set of ZF gears, then exit the hull through Tides Marine shaft seals with 5-blade Nibral props as the final destination. Mary P's centerline skeg is slightly lower than the props, in case she has to beach the tide. Note the angle of the transom is not vertical, the rake helps in backing on a fish by letting some of the water go under the boat easier.

Trim tabs, right? There's more here than meets the eye. These tabs also work as stabilizers! That's right, these gyro controlled, hydraulically activated tabs add deflection (lift) as needed.

Note the offset placement of the rudders to better facilitate prop removal. The rudders are a symmetrical airfoil design and have a total of 35 degrees of deflection to counter about 100 feet of keel trying to follow a straight track. This transom design was specifically tested in the tank to make sure it would work. Also note the slight “V” when looking at the stern, acts like a shallow bow when going astern. There is an underwater camera in the transom as well as cameras on the outriggers, all to study fish in the baits or striking.

Just how big is Mary P? Two technicians comfortably fit into the propeller pockets...

Deck Plans: