Why were helicopters not used during the world wars?

Nearly every modern warship has a flight deck and aviation hanger to take advantage of helicopters. But most WW2 era warships don't didn't these, unless they were purpose-built aircraft carriers. And even then, they only carrier prop-planes, not helicopters. Why is this? Did they just not know how to make them? What was the technological breakthrough that made helicopters a reality for the first time?

Also, if one side had started using helicopters during WW2, how might the other side have gone about countering them?

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This is such a fucking easy question that requires zero discussion

Sage

>During World War II, Nazi Germany used helicopters in small numbers for observation, transport, and medical evacuation. The Flettner Fl 282 Kolibri synchropter—using the same basic configuration as Anton Flettner's own pioneering Fl 265—was used in the Mediterranean, while the Focke Achgelis Fa 223 Drache twin-rotor helicopter was used in Europe.[citation needed] Extensive bombing by the Allied forces prevented Germany from producing any helicopters in large quantities during the war.

>this is such a fucking easy question
>doesn't answer the question

Why even post?

Do you even know when helicopters started to be used heavily in warfare?

This is like asking why the confederacy didn't utilize the atomic bomb to defeat the union.

Because I'd rather belittle you

Veeky Forums in a nutshell.

you really are kind of a dumbass for asking
The fact that you said world warS shows you have done zero research yourself

Eough dancing around the bush, time to spell it out.

Helicopters did not exsist during WW1 (you idiot), and were only an experimental new technology in WW2. the First mass production helicopter was the Sykorski R4, which started production in 1942, and was simply not attractive to the avy due to it's lack of range, altitude, weapons or passenger capability, not to mention not being designed for sea conditions.

Only later in the war, when the army and airforce had proven it's utility, did the navy order some modified models for testing. However, these were for V.I.P transport and SAR, not combat.