- Can you fly a model helicopter on a train?
Fun question! As has been pointed out, there are a number of unspecified variables here, but I would have to say that you're right in any case.
- How can I make a working model helicopter?
Counter rotating main blades. Go to www.horizonhobby.com and look at the E-Flite CX and CX-2. They are very stable and do not use a tail rotor. The main shaft has 2, one inside that rotates one way and an outer shaft that rotates the other way. This will be very difficult to build from scratch, but good for you taking on the challenge and good luck !
- What was the make and model of the helicopter used in I Am Legend?
It is a Coast Guard HH-65. Eurocopter manufactures the SA366 G1 Dauphin which is a variant of the AS365 that meets the Coast Guards requirements for Search and Rescue (SAR).