The answer to this is not as clear as you'd think.... They certainly can not invert and fly along. However certain designs can do rolls where the helicopter momentarily inverts. One of the first helicopters to acheive this was the Lynx.
yes they can.
They fly helicopters.
You can fly helicopters.
They fly in California.
There are many different helicopters. Most small civilian helicopters may fly for about an hour, but large passenger or military helicopters can fly for 6 hours or more.
No
so we can fly
Helicopters can fly directly up or down.
Yes, there are helicopters available.
Some experimental helicopters can fly as fast as 300 mph. However most helicopters in service fly less than 200 mph.
first u stick a dog onto one of the pro-pellers with stick tape, alot of sticky tap. then u get a pilot and tell them to go upside down and as the helicopter turns upside down the dog will be on the bottom. simple....the simple algramithric equation is: y= 726x9+t-53t/2 thank you. please unless u can complete year 2 maths dont try this at home.