The vast majority of helicopters cannot fly above around 8,000 ft. The SA.315 Lama however set a record by flying at 41,000 ft. It regularly operates at over 20,000 ft. It is the worlds highest flying helicopter. In India it is called the Chetak.
Helicopters themselves aren't the limiting factor in their ceiling. Above 12,000 feet, pilot and crew need to be on supplemental oxygen. That said, a helicopter's VTOL ability is of little value at altitude so their role means they stay within a few thousand feet AGL.No, Helicopters cannot fly in Stratosphere. It is too high for them. They do not produce that much lift. But they can fly in the Troposphere.
Yes, helicopters fly high when on long journeys.
Because the air gets too thin.
They fly helicopters.
They fly in California.
You can fly helicopters.
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.