The Hind Mi-24D was an odd but deadly amalgamation of troop helicopter transport and attack helicopter. While it was ostensibly built to transport a squad of infantry and then protect it, American chopper pilots were worried about what would happen if they ran into the attack helicopter and its massive gun and were forced to fight it in the air.
One Marine Corps pilot, Lt. Col. Richard L. Phillips, took a long look at the problem and put together a proposal in 1979 to make his service's Cobra helicopters a lethal counter to the newest Hinds. Some of his suggestions would go to change the Cobra program forever.
An AH-1 Super Cobra fires rockets in training.
(U.S. Marine Corps Gunnery Sgt. Dean Verschoor)
The first thing to understand about a Hind D vs. Cobra fight is that neither of the platforms was actually designed for air-to-air combat. Cobras were initially designed for the Army to use in protecting ground troops and Huey utility helicopters from surface threats. Hinds were made to drop off troops like Hueys and then provide close combat attack support from the air like Cobras.
The Marine Corps SeaCobras and later SuperCobras were stronger than their Army counterparts thanks to the addition of a second engine and an improved main gun. The Army would later adopt the Marine's 20mm main gun on later Cobra models instead of the 7.62mm miniguns and 40mm grenade launchers that they had originally mounted.
But while that 20mm main gun was great for wiping out enemy armored vehicles and light bunkers, its rate of fire was limited to 670 rounds per minute in order to keep it from moving the Cobra too much while it was firing. Meanwhile, the new Hinds had a large, multi-barreled gun that Phillips and others were worried had a higher rate of fire and higher muzzle velocity.
The Mi-24 is a great helicopter that, despite a rocky start, rose to be a major threat to U.S. forces in the Cold War.
(Rob Schleiffert via flickr, CC BY-SA 2.0)
It would later turn out that the Soviets were using a Yak-B main gun with 12.7mm rounds that had a muzzle velocity of 810 meters per second, less than the 1,050 m/s of the Cobra's M195 20mm gun. But the Yak-B on the Mi-24D could fire up to 4,500 rounds per minute while the Cobra was limited to 670.
Worse, the Russian pilots were training for air-to-air combat in the Hind. When Phillips and others started matching Hinds and Cobras in simulators, it became apparent that victory or defeat in a one-on-one fight would be decided by pilot experience and main gun capability. And the Marines thought they were behind in both training and armament.
But Phillips thought it was likely that Cobras and Hinds would meet in future conflict, and that the Marines would need to up-arm their Cobras or else buy more and deploy them in larger teams so they could win through superiority of numbers.
Obviously, the Marines would prefer to win through excellence rather than throwing unsustainable numbers of pilots and helicopters at the problem. So Phillips proposed two fixes for the armament and one fix for training.
First, his simulation experience against the Hind showed that an air-to-air battle between it and a Cobra would be over quickly. Often, the helicopters settled their conflict in a single pass as one or the other shot down the enemy with a burst from the main gun. To make the Cobra more successful, he wanted to give it a higher rate of fire and muzzle velocity with improved ammunition or even a new gun. Also, an improved sighting mechanism would increase Marine chances.
But he also wanted to add an entirely new weapon onto the helicopter: air-to-air missiles. This is one of the adoptions the Marine Corps would later make, deploying Sidewinder missiles on the helicopter in 1983, four years after Phillips' paper was written and submitted to the U.S. Army War College.
The AH-1Z Viper has an even better version of the 20mm Gatling guns used on the AH-J SuperCobra.
(Lance Cpl. Christopher O'Quin)
But Phillips also wanted to change training and briefings to address the air-to-air threat. The Russians were training specifically on combat against helicopters, and he wanted the Marines to do the same. And one step further, he wanted transportation helicopters to carry some weapons for self-defense against the Hind, and he wanted those helicopters' crews to discuss air-to-air procedures before any mission where enemy aircraft could be in play.
All of this combined would have made it to where up-armed Cobras would escort lightly armed transportation helicopters into combat and, if an enemy Hind were spotted, the entire flight would work together to bring down the Russians before the Hind could win the day.
Luckily for everyone involved, the fight never went down. But if it had, those Sidewinder missiles and better training would likely have saved Marines and troops from the other three branches forward as Hinds fell to the snakes in the grass.