Almost the same as the other similar aircraft engines. And depends on the size of the helicopter, consequently to the power of the engine.
He didn't have or build an actual helicopter. It was just a sketch.
It depends on model.
1,000,000.00
$2
The cost to obtain a helicopter license varies between locations, type of helicopter used, and prior training. The basic answer would be around $15,000.
In the area of $100,000, 000.
£57,000,000 inc tax
It cost about 14 million to 16million dollars U.S.
If you have to ask it's too much
Can be over 2 million dollars
Even a cheap civilian helicopter is well over 3 million dollars
No, diesel engines cost more to build than petrol engines. They are built much heavier.