The view from down in the cabin on an open transom boat can be a little alarming. You're actually looking up at the stern wave at times. It doesn't board, but it's right there. The camera is resting on the companionway sill.
About 7 knots
Speed up to 10 knots and it stretches out a bit.
About 8 knots.
By the time we were passing 12 knots later the wake was getting long indeed. Notice the water shooting up out of the rudder cassette.