I have the Kiwi prop on a perkins 4.108
, yes reverse is well over proped and cant get more that 1400 revs but coming into the dock
puting it in reverse is like slaming on the hand break. Mine has been intentionaly over pitched in forward giving me hull speed
at 2400 revs and works out at 2lts/hr. Max reves 3000 then starts to blow soot. do I like it, hell yes, and next to no drag when sailing. Though it does turn the shaft when sailing over 7.5 / 8 knots.