Any sites that I can find info on helicopters?

Question

I need some sites for my research project in school and all the ones I've found are about the companies that make helicopters. I need sites that give me the history of the machine itself, not the companies that makt them. Anyone got some sites or advice?

Answer 1

http://en.wikipedia.org/wiki/Helicopter

alot of info there

Answer 2

have you tried www.wikipedia.com???