I have a cruiser friend who has two D400's on a monohull
mounted on poles on each side of the stern. He says he gets a beat frequency noise
from them and that they are always fighting each other from the perspective of both voltage regulation and wind interference
. He mentioned that it may have not been a good idea.
I guess mounting two on catamaran
sterns may mitigate the beat frequency noise
and wind interference
and the regulation problem can be dealt with easily.
However, I would not want to live on, or anywhere near, a boat with three Air-X. These are as rude of a cruising boat item as open frame generators left running on deck
all night. Yes, I know I will take flak from that, but I will continue to tilt at that windmill of getting owners to understand they piss everyone else off, even though they have "become accustomed to the noise" or "enjoy knowing when the wind has picked up in the middle of the night" or "that's the sound of free energy" or any other selfish explanation that they give.