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Alysum said..
My HPS wings are silent, however the 420 tail is very noisy, so check the trailing edge of your tail.
370 is quite draggy for HPS which probably makes it worse.
I run the 370 tail on the 930/830 HPS pretty happy with the speed and turning so far but still early on in trying to figure out what I want these wings to do.would love to hear what others are running .