- Reaction Window: You have less than 5 seconds to react once a Human Missile is sighted.
- Speed Factor: The Ohka approaches at over 450 knots (600 mph), leaving no time for hesitation.
- Visual ID: Look for a small, gray glider with a 16-foot wingspan dropping from a bomber.
- Primary Defense: Massive anti-aircraft fire is the only effective countermeasure.
- Impact: A direct hit causes catastrophic damage and massive crew casualties.
Understanding the Human Missile Threat
The term "Human Missile" refers to the Yokosuka MXY-7 Ohka, a rocket-powered suicide aircraft used by the Japanese Imperial Navy during the late stages of the Pacific War. Unlike conventional aircraft, the Ohka was carried underneath a "Betty" bomber and released near its target. It was essentially a piloted bomb, capable of reaching speeds over 600 mph thanks to its three rocket engines.
Video Highlights:
- Visual documentation of the Ohka attack on USS Shea.
- Real-time breakdown of the 450-knot approach speed.
- Analysis of the "Shootin' Shea" crew's defensive reaction.
The Ohka's primary advantage is its terminal velocity. Once the rockets are ignited, the descent is so steep and fast that standard gun tracking systems often fail to lock on in time.
Technical Specifications
To effectively time your defense, you must understand the capabilities of the weapon you are facing.
| Feature | Specification | Tactical Impact |
|---|---|---|
| Warhead | 2,600 lbs (1,180 kg) | Ensures destruction of most ships upon impact. |
| Speed | 450-600+ knots (at attack) | Reduces reaction time to under 5 seconds. |
| Range | ~20 miles (glide) + rocket boost | Limits launch range but creates high terminal speed. |
| Wingspan | 16 feet | Makes visual identification difficult at distance. |
Launch Timing and Detection Phases
Surviving a Human Missile attack depends entirely on recognizing the sequence of events leading to the launch. The attack pattern typically involves a mother aircraft (Betty bomber) approaching the fleet before releasing the Ohka.
Mother Plane Identification
Radar operators must track incoming "Betty" bombers. These aircraft often fly higher than standard attack patterns to release their payload. If a bomber alters course suddenly or slows down, assume a launch is imminent.
The Release Point
The Ohka is typically released 6-10 miles out. Visually, look for a small object detaching from the bomber. The Ohka will initially glide, picking up speed before igniting its rockets.
Terminal Dive (Ignition)
This is the critical timing window. Once the rockets ignite, the Ohka accelerates rapidly. You have seconds to shift fire to the new threat. The sound of the rocket engines is often the first confirmation of the attack.
Impact Imminent
At 450+ knots, the missile covers the final miles in seconds. Gunners must lead their shots significantly. If the missile strikes, it has enough kinetic energy to punch completely through the ship, as seen in the USS Shea incident.
Focus your radar picket ships on the sector between 6 and 10 miles out. This is the "kill zone" where the Ohka transitions from a glider to a rocket-powered projectile.
Defensive Strategies and Countermeasures
Countering a Human Missile requires a layered defense. There is no "dodge" mechanic; you must destroy the missile before it hits the hull.
Defense Comparison Table
Different defensive measures have varying degrees of success against the Ohka's speed.
| Defense Type | Effectiveness | Pros | Cons |
|---|---|---|---|
| 5-inch Guns (AA) | High (Medium Range) | Explosive shells, good range | Slow tracking against fast targets |
| 40mm Bofors | Medium (Short Range) | High volume of fire | Limited range, requires precision |
| 20mm Oerlikon | Low (Last Resort) | Very high rate of fire | Weak stopping power vs warhead |
| CAP (Fighters) | Critical | Kills mother ship | Must penetrate enemy escort screen |
Early Detection
- Radar Vigilance: Maintain constant radar sweeps.
- Visual Lookouts: Place observers at high points.
- Communication: Report "Betty" contacts immediately.
Saturation Fire
- Volume over Accuracy: Put up a wall of lead.
- Barrage Method: Target the predicted flight path.
- Coordination: All batteries engage simultaneously.
Damage Control
- Preparation: Have repair parties ready before impact.
- Flooding Control: Be ready to counter list immediately.
- Medical Aid: Expect high casualty numbers.
Case Study: The USS Shea Incident
On May 4, 1945, the USS Shea (DM-30) survived a direct hit from an Ohka, providing the best historical data on launch timing and impact effects.
Attack Timeline
The following table reconstructs the timing of the attack on the USS Shea.
| Time (AM) | Event | Reaction Time |
|---|---|---|
| 08:54 | "Betty" bomber sighted 6 miles out. | Crew engages standard AA protocols. |
| 08:59 | Ohka released/detected on starboard beam. | Immediate General Quarters. |
| 09:00 | Ohka impacts ship (5 seconds after sighting). | Insufficient time to destroy missile. |
Despite a direct hit that tore a 4x5 foot hole through the ship, the Shea survived because the missile passed through the ship before exploding. This highlights the importance of compartmentalization and rapid damage control.
Damage Assessment
Understanding the damage helps in prioritizing repairs after an attack.
| Damage Type | Severity | Cause |
|---|---|---|
| Hull Breach | Critical | Kinetic energy of the missile punching through. |
| Comms Failure | High | Severed cables and shattered equipment. |
| Armament Loss | Medium | Forward guns knocked out by impact force. |
| Casualties | Severe | 35 KIA, 91 Wounded from metal fragments. |
Survival Checklist
To ensure your crew is ready for a Human Missile scenario, use this pre-battle checklist.
Pre-Engagement Safety:
- Radar calibrated for high-speed contacts
- Ammunition loaders staged at all AA batteries
- Damage control lockers opened and equipment distributed
- Medical teams stationed in protected compartments
- Watertight doors secured and tagging system active
FAQ
Q: What is the exact launch timing of a Human Missile?
The Ohka is typically released by a mother aircraft approximately 6 to 10 miles from the target. Once released, it glides briefly before igniting three rocket engines, accelerating to over 450 knots in the final dive phase.
Q: Can you dodge a Human Missile once it is launched?
No. Due to the extreme speed (600+ mph) and the fact that it is guided by a pilot, evasive action is generally ineffective once the rocket dive has started. Your only option is to destroy it with anti-aircraft fire.
Q: How much time do I have to react?
Historical accounts, such as the USS Shea incident, suggest you have **less than 5 seconds** from the moment the missile is visually identified to the moment of impact. This requires guns to be manned and ready constantly.
Q: What happens if the missile hits the ship?
The 2,600-pound warhead causes massive devastation. However, as seen with the USS Shea, if the missile's high velocity carries it *through* the ship before the warhead fully detonates, the ship may survive, albeit with heavy damage and casualties.