High pitched brushless whine! Really goes through your head, but going to the bigger brushed motor solved all problems. Basically silent running now. And also, the cheap brushed ESC gives equal performance both forward and reverse, which the brushless didn't.
But, like I said somewhere in a previous post a while go, the brushless 2836- 1500kv running the fast boat, is acceptable by my lady, who owns both Albert and the Fast boat. She hated the whine in Albert to the point where she didn't want to run him, but now she's a very happy lady.
And thanks for sorting those previous posts which were totally out of order.