gday john ,
always hard w a paddler ,performance is altered by hull shape ,paddle efficiency,and i suspect diameter.i use monerperm piles +3:1 reduction via t/belts , giving a paddle shaft speed , no load ,of approx. 300/350rpm,i can slow it down w the s/control on the water , but on a windy day , i use all the revs , but on better days , i can slow down the shaft revs , and the hull actually goes faster , i think this is the designed speed for the hull , i call it "walking the hull " i cant explain this any better .
by increasing the paddle shaft revs , i get more thrust , but create a lot more bubbles .
the hull shape of the aussie paddler doesn't help , blunt bow
the tug hull should be easier to drive .
my personal view , is that you need at least good thrust for a model , and wind doesn't help , so i now aim all my paddlers at 300/350 rpm , we can always slow it down w speed controls .
i would like to have a go at a UK paddler ,but the building card is a bit full,and the file is growing every week !! it keeps me sane , to dream a lot +2 ither Aussie paddlers in the shed , under construction ,plans for no. 4 LOL
good luck , bill