Stern Wave and Oil Mustache

This is normal running speed and with the bow in a good position down. You can see a higher oily mustache up around the…
This is normal running speed and with the bow in a good position down. You can see a higher oily mustache up around the engine exhaust which was from a section where we had to push hard to make a bridge. During that running time the stern squats and more oil comes back onto the stern.
The key here is boat fore and aft balance. If the stern wave is dragging back onto the boat, then you will get a mustache for sure.
On the IP27, which we sailed for 10 years, this stern wave will nearly always be there because the underbody of the boat is not designed to have a smooth trailing stern wave.
The newer 3 digit boats, with the sugar scoop i.e. swim platform, you will see the stern is way high off the water at anchor. Then when motoring, the stern wave trails off and the wave comes right up this designed scoop position. If a 3 digit boat is over loaded then it's scoop will be too low and hence it too will get an oily mustache.

I am convinced that keeping the boat on here designed lines, and not over loaded and bow down....this will reduce the oily IP mustache.
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Hayden
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Stern Wave and Oil Mustache
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