Chopjock - yes the heavier one has to push more air, so how does it do that with the same RRPM and the same blades? It has to accelerate the air using more pitch and more power to produce a higher speed of downwash.
Cappy
If you know everything there is to know about VRS, then tell me what you would teach to someone so that they could always avoid it.
I did exactly that in an earlier post.#15
You keep repeating your post about 'envelopes' and making it easier or more difficult to avoid them - what is the actual point you are trying to make?
Can you not understand that when you say it is easier to 'avoid the smaller envelope' of a light helicopter, that it looks like you are saying it is easier to avoid VRS in a light helicopter????
As we have both established, the lower downwash speed of a lightly loaded helicopter means you can reach the required parameters for VRS much more easily (that makes it more dangerous) than in a helicopter with a heavily loaded disc.
This is all about terminology - the facts are that a lightly loaded helicopter is far more likely to encounter VRS in a steep and slow approach than a heavily loaded one because it only has to reach a much lower RoD to start ingesting its own downwash.
Is that clear and comprehensive enough to make you understand?