The Amazing Engineering of Rescue Helicopters - Smarter Every Day 289

This video is part of a deep dive series on the US Coast Guard, following previous episodes about rescue operations, boats, and search patterns

The MH65 Dolphin is an incredible rescue helicopter, though the Coast Guard is transitioning to the newer Jayhawk platform

Destin is joined by AMT 1 James Hockenberry, an Aviation Maintenance Technician first class who serves as a flight mechanic and hoist operator

Exploration of everything about how the MH65 Dolphin works, from structural components to operational systems

The tail rotor acts as a fan that counteracts the main rotorhead turning, pushing in the opposite direction to keep the aircraft straight

• Controlled by pedals in the cockpit through the tailrotor drive shaft • Hydraulic actuators push in and out to make the blades turn • Uses military red hydraulic fluid rather than civilian blue (Skydrol)

• Vertical and horizontal stabilizers provide additional stability • At speeds of 80 knots or above, the tail is not needed • Vertical stabilizer and fins are tilted to counteract blade rotation effects

The tail fenestron is made of fiberglass, kevlar, and carbon fiber to keep weight minimal

The helicopter uses LED lights for nighttime operations and general illumination

Infrared lights are used during secret squirrel missions where the aircraft goes blacked out, turning off all visible lights

The Coast Guard performs RWAI (Rotary-Wing-Intercept) missions, primarily conducted out of Atlantic City

• High frequency antenna for long-range communications • Coast Guard identification light on the fuselage • Additional lights positioned on the aircraft ends

The helicopter follows the standard engine cycle: intake, compression, combustion, and free power turbine

• Two hydraulic reservoirs (primary and secondary) supply servos and actuators • Uses Mobilejet 254 engine oil for the engine reservoir • JP8, Jet A, and similar aviation fuels power the engines

Thermal couples measure turbine gas temperatures (TGT) and send data to the cockpit for monitoring

FADEC (Full Authority Digital Engine Control) monitors all engine systems and parameters in the cockpit

Mechanics work with right, left, forward, and aft inputs that appear opposite due to gyroscopic procession of the rotating blades

When the rotor system turns, the helicopter bites in the direction opposite to the control input due to gyroscopic procession

• Mechanics measure blade track distance based on pitch control rod (PCR) positioning • Adjustments made with weight additions and trim tab bending • Three-stage process: ground hover, and flight checks

After major inspections, the rotor head is removed and the pitch control rod is readjusted with new components

• 3,000 PSI hydraulic system controlled electrically • Booms in and out electrically via handheld pendant control • Moves up and down hydraulically

• Maximum speed: 200 feet per minute for normal hoisting • First 10 feet: 50 feet per minute for controlled lowering • 240 feet of stainless steel cable available

Preferred hoisting height is 35 feet above water, which is in ground effect and provides more power while minimizing pendulum hazards

• Too-fast hoisting can injure swimmers • Two-blocking (full up) can jerk and hurt a person's back • 600-pound maximum weight capacity for rescues

When hoisting a person, momentum conservation causes the pendulum swing to amplify as the cable length decreases

Small initial swings become worse and worse as the person is hoisted up due to decreasing cable length and conservation of momentum

A small swing starting at high altitude becomes much larger as the person descends, creating dangerous collision risk with boat rigging

Flying lower to the water reduces pendulum effects and minimizes risk to swimmers from dangling rigging on shrimping boats

Helium-pressurized floats are activated by pilot controls on the collective, copilot controls, or a manual shot switch

Floats must be activated before the helicopter touches water since they are not water-activated

The helicopter will stay afloat for approximately four minutes in light winds with floats deployed

The heavy rotor head causes the aircraft to roll over after ditching, so training emphasizes water survival and egress procedures

Unlike cars, the pilot sits on the right and copilot on the left due to the French aircraft design origin

The pilot-in-command sits near the hoist and makes all operational decisions about rescue procedures

• Both pilot and flight mechanic seats move left and right • Flight mechanic seat swivels 360 degrees • Swimmer seats were upgraded 7-8 years ago with improved ergonomics and mobility

Emergency exit door normally closed except for engine maintenance or egress in water emergencies

Corrosion is the primary enemy of the aircraft; water from wet swimmers creates conditions where the fuselage corrodes

• Main structural frames are highly susceptible to corrosion • Stringers are critical load-bearing elements that ground the aircraft if corroded • Texas patches and fish plates reinforce areas prone to cracking

1980s-era Rockwell Collins avionics and electronics require maintenance by AET (Avionics Electrical Technician) specialists rather than AMT mechanics

Regular inspections on 7, 14, 30, and 90-day cycles focused on finding and preventing corrosion before structural failure

Cable cutters aboard allow flight mechanics to sever the hoist cable in emergencies for crew egress

• Titanium quick splice reattaches the cable in emergencies without full recovery • Rated for 600 pounds like the main cable • Limits hoisting to 50 feet per minute and prevents two-blocking

Flight mechanics view swimmers as family and heroes; swimmers see flight mechanics as essential to their survival

The entire crew operates with the goal of bringing rescued swimmers back to the aircraft and home safely, never leaving anyone on scene

Destin will become the duck (rescue basket subject) on Lake Pontchartrain in New Orleans to experience actual rescue operations

The Smarter Every Day Coast Guard series continues with practical demonstrations of all the helicopter systems in action

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Destin thanks supporters and reiterates the channel's mission to help viewers get smarter every day