Basically if you scale dimensions down by 25 and speed down by 5 things will happen at the same relative fraction of hull speed. If wave heights and wave lengths are scaled by 25 then wave speeds are also down by 5. So things work out well. However, in the model everything is happening 5 times faster. So if you see something tip back and forth every 2 seconds in the model it would be every 10 seconds in the full sized version. A 10 knott wind in the model is like a 50 knott wind in full scale.
Great find ! So the wave testing videos just have to be linearly slowed down and the result should be good enough ? I guess the only remaining discrepancies will be due to the different ratio of viscous and dynamic drags.
If we imagine a full scale one being 16 times bigger, or 144 foot diameter, then slowing down by 4 is correct. So that is what I have done. Really if I could have figured out how to do 3.5 I would have for my 1/4 acre 112 foot diameter size. I wish my camera could shoot at 4 times the framerate so it looked better when slowed down. Video below and I have also updated my “Tension circle house” proposal to include the new video.