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Using 56104 500KV BLDC w/5:1 gear reduction for water propulsion? Answered

So, it works with 2.4Gz Tx/Rx RC controls currently, but wreaks havoc on the gearbox with sudden
stopping and I need to make it accelerate and decelerate smoothly and slowly. I have
never used an arduino as yet, but this is my preferred method. BTW, 2.4Gz does not transmit
well through water at all! I need to use something in the Mz frequency range as well. Any ideas?