Ok I have the official speed report on the Cheiftian.
At aprox. 3000 rpm I had the boat doing
Fifty!
Well to be honest it was 50 kph.
I think thats where the original confusion has started with the speed debate.
The PO told me it would do 38-40 I thought he had said mph but obviously it was kph, lol.
However when you do the metric conversion it still puts it at 31 mph.
That was loaded down with all our camping gear, food, water, two anchors.
One huge over sized anchor and one proper sized anchor.
Also I dont think I was pushing it to the maximum but pretty close.