Can I just say something... (Well it can`t possibly take the level of this thread any lower, can it?)
The Apache helicopter has an engine of 1696.39 horsepowers (1265KW).
The FA-61 had 160 Horsepower.
One of the heaviest tanks in WWII, King Tiger had an engine capable of doing 700hp...
Chew on that for a while...
And that is not even mentioning armanent, aerodynamics, propellor desings...
Also to quite tell the truth I see no use for a possible slow and cumbersome Machinegun-armed helicopter in WWII... One man with a rifle would enough to put it down. (Remember that it took years of developement to get those helicopters higher than 100 feet, and even more years to fit in those armor platings as well...)
Now in Vietnam VCs did not have an organized Anti Aircraft defense, mainly due to their Guerilla style of fighting. Yet even during those days, with Helicopters being arguably the most efficient weapon that USA had to offer, The Vietnamese dropped them, with hand guns and bazookas. Now think of that, with a chopter of no real armor, speed, manouverability or chance to fight back and an enemy with organized anti-aircrafting, spotters, panzerfausts and machine guns...
Maybe for ambulance duties or as airlifts, maybe even to go in for supplies, but at what cost? Air defense = 0 ? One man with a rifle and a keen eye could take down a dozen of those... Not to mention a whole company, with Anti-air guns, machine guns, panzerfaust...
Granted WWI aeroplanes weren`t that much of a "tanks of the air" either... But bear in mind that hose days there was no AA-fire, rifles and machine guns were ten times worse and no one cared enough to spot the planes.... But a steady 50km per hour moving target 20 feet above the ground, with no armor, filled with fuel and supplies... Yeah, that`s just what we need... :wacko: