Can't help it...
Train scenario: As long as the helicopter model is kept inside the cabin -yes the model helicopter will behave exactly the same stationary or at speed as it is not exposed to the relative wind on the outside. Same as a fly in an airliner at Mach 0.82. There is no acceleration except that the model or fly do in relation to the environment. Same as us all living on Earth.
Hughes 300 scenario:
Yes you are correct as long you are on the "right side" of the power curve. The aircraft will correct itself back to the initial speed due to a "good" L/D ratio. Try this at 30 kts with 20 kts wind, and I think you will find it different
What is dangerous here is that some people don't understand the relationship between GS and IAS and energy required. Most posters have elected to ignore the dynamics of slow speed flight, i.e. flight at speeds below best L/D. At higher speeds, the aircraft takes care of itself. At lower speeds, it
does not unless you are on 4 axis autopilot.
Energy in aircraft is either altitude or engine power (and you might add your current speed, but that is temporary). If you are out of one of these , be very careful. If you are out of two or more, you should not be there in the first place.
