Originally Posted by njensen
what is fast ?
I get 31-33 knots @ 5200 rpm with a 90 HP E-Tec on my SR4.7 (15" alu prop).
Inititally i tried a 17" alu prop but it only gave me 4900 rpm wot.
33 knots is fast enough for me on a 4.7m rib...
Is there something wrong with your setup ??
That 33 knots are fast enough is one thing but I would assume that the max speed with 90hp ETEC on the SR4.7 would be higher !
My old Yammi 90 2stroke pushes my SR5.4 with big Osprey console , 90 liter tank + myself with appr 120kg up to 38knots (GPS) with a standard Yamaha aluminium prop 19 pitch .
Cheers - Jürgen