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It's no secret that I'm not a fan of a large army aviation (helicopter) branch. Some Western army aviation branches have slid towards gold-plating since the late 70's and failed to deliver on the promises. Army helicopters are also a huge fiscal and logistical pain in the cushions.
There are four distinct dominant modes of attack helicopter (in a wide sense) operations;
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Alouette helicopter with SS.11 ATGMs |
(1) The standoff approach. Anti-tank helicopters hover close to friendlies, serving as a very mobile floating anti-tank missile launcher system. These may have great use for theatre command because this way 50+ ATGM launcher systems can be moved by almost 100 km in 30 minutes. This mode of operation doesn't require much; you can bolt on ATGM launchers onto a civilian helicopter or a utility helicopter, bolt on a stabilised optic for fire control and that's it. The West German PAH-1 followed this concept, as did Gazelles and Alouettes and Hughes 500 Defender series models.* The conversion is so affordable that there have been dozens such conversions.
The biggest problem to this concept was the introduction of self-propelled anti air gun systems such as Gepard and "Shilka" which made this tactic much more dangerous. You need at the very least a radar warning receiver to cope with this problem.
A more careful attack helicopter would strive to expose itself only as much as necessary, if possible only a mast-mounted (top) stabilised sensor. This behaviour largely eliminates the bird's view advantage and reduces the field of vision to rather short ranges on many forms of terrain. The required very low level flight reduces the advantage of the helicopter over soft ground vehicles mostly to its greater speed, which may easily mean it just gets more opportunities to run into trouble.
(2) Climb, approach, hit and run. The Soviets liked this most. The attack helicopter climbs, spots the target, flies a bit towards it and fires with unguided rockets and an autocannon with limited field of fire (forward). This tactic was likely the explanation for why
some Russian attack helicopters have an almost fixed gun. It also requires heavy hardening for vital components and the crew.
This tactic turned out to be not such a great idea once the helicopter faced at least ManPADS or other basic very short range air defence systems. It was a great success in the very early 80's over Afghanistan, though.
The U.S.Army also liked this approach a lot before the TOW missile and the impression left by Shilkas changed the picture. This largely explains the genesis of the AH-56A Cheyenne program.
(3) Hover or circle high and shoot at ground-bound opposition preferably with a fully movable autocannon. This is what we know from milporn videos of Apaches killing insurgents in Iraq. It doesn't work at all in face of effective air defences (same fate as fixed wing gunship tactics and related loitering flying drone tactics).
(4) Infiltrate with a helicopter's unimpeded high mobility over all terrains (but high mountains), then proceed to attack the enemy's rear area. This was typically advocated by the most ambitious army aviation branches; dominantly in the U.S.Army, but it was also advocated by
Simpkin and exploited by the German
Heer to justify the Tiger and NH90 programs during the budget squeeze of the 90's (long dropped since).
In theory, this yields easy success against supply columns, low readiness combat troops, headquarters and so on. In practice it first and foremost requires a much more sophisticated helicopter than mode (1); armour, more versatile fire control, a gun, unguided rockets, a second engine, long endurance, versatile armament, radar/missile/gunfire warning and locating sensors, possibly an obstacle avoidance sensor (to avoid power lines at night), long-range radios, missile countermeasures et cetera.
The problems with this tactic are that the helicopters expose themselves to much hostile fire (including small arms fire and heavy machinegun fire against which a 100% passive protection is impossible) and the endurance is still a problem.
An air mechanisation approach which meant to provide such attack helicopters with utility helicopter escorts for command/control, electronic warfare, infantry 360° security on the ground during breaks and refuelling capacity was developed and ranks high among the least cost-efficient army concepts ever devised.
The
low tech ambush against a AH-64 Apache-equipped regiment in 2003 which downed one Apache* and damaged 28 others has forced many to re-evaluate the survivability of attack helicopters over hostile or contested ground in a conflict with an actually competent opponent.
It would be pointless if I pretended to draw conclusions from these four modes. Fact is, I described these modes years after having drawn my conclusions:
I'm for some cost-effective utility helicopters (such as the Dhruv). Some of these could be equipped as basic anti-tank helicopters in order to provoke potential adversaries to waste resources on countermeasures and in order to distort their tactics with a bit caution.
I also see a niche for a few heavylift helicopters, albeit all but the Mi-26 seem to be ridiculously overpriced these days and the Mi-26 is too big and too expensive in operation.
The glorified thoroughbred attack helicopters - well, I don't think that they're worth the fiscal and logistical hassle in face of a really dangerous opponent. And we would have done something really wrong if we face not really dangerous opponents, for it's almost unheard-of that inferior powers attack a powerful alliance.
S O
*: The success of anti-tank helicopters depends a lot on the spectacular outcome of remarkable exercises in Germany on civilian property (tanks were even allowed to run over fences) in '73/'74. These pitted helicopters with 3,750 km range TOW missiles against tanks and M163 SPAAGs with a 20 mm gatling gun which was limited in range to about 2,000 m. It was a turkey shooting for the helicopters and the kill ratio ranged from 3:1 to 14:1 in their favour. Suitable countermeasures changed the picture dramatically and the M163s VADS was no adequate representation of Soviet "Shilka" anyway.
**: Published at the time as a "Iraqi farmer shot down a American helicopter with his rifle" story.
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