Ok I did search this topic but it may be so crazy no self respecting operator would ask, So self respect be darned here goes. Has anyone tried or heard of any rotor quieting devices such as lightweight shrouds, wing tipped rotors (reduce vortice noise), variable pitched blade sets, etc..? Why you ask would I be interested in quieter operation? For the same reason I go to the fish market, for the Halibut! Ok that was bad but it honestly just seemed like a natural evolution especially for anyone operating near communities, wildlife, LE Operations. Yes some ideas will add weight however I suspect motors and batteries will become more powerful and efficient.