Performance question

[Snider]

4,200 with 4 adults 2 kids 16.8knts against 0.2knt tide.

If this is at WOT (wide open throttle), you need to take 2 or probably 4 inches out of your prop pitch: down to 13 or even 11 from 15 inches.

4,200 rpm and WOT is really lugging the engine, badly.

Joe. :teeth :thup

That’s not WOT. The OP stated he was getting 11kts at 4,200 RPM. I was just comparing.