There is no way such a complex machine could be built by one person.  People can have very specialized skills like being a rotor blade composite engineer because they earn money for their work that other people are willing to take for goods and services.   If there was no money a composite engineer would need to find a farmer who needed composite work done in order to get food in a barter economy.   Money allows us to specialize and still get what we need.  Without money there are no composite engineers thus no new helicopters.  Bitcoin is a better money and will make free trade of specialized skills even better.