It wouldn't do to try and explain the profile on the helideck real time. It should have been done as a focused communication upon introduction of the aircraft and implementation of the different flight profiles, in a fashion much like the example I gave.
In the 139's there is a PA system. In the 412 there isn't. The guys all have ear plugs or protectors on so even before we start, communicating to them is tough and like I said a lot of the Pax don't speak very good English!
If we have an issue on start-ups or we make a go-around while on approach, rather than tell them there and then we will tell them why we did it once back on the ground. Same as if the HP is told to go-around by the NHP. No point discussing it there and then, do it on the ground!
There are more important things happening in the cockpit than holding the hands of the passengers. They trust us to do our job. If the company dispatchers want to brief them on the take off profiles that will be used then great, not really my job to tell them that while trying to fly!
I will be more than happy to explain anything when I get back to the heliport.