#Wood runabout transom saver driver#

#Wood runabout transom saver driver#

The end result is that either 2- or 3-blade propellers may be used depending on driver preference.īoat # 2-Blade Propeller 3-Blade Propeller Since the motors are all used, reconditioned or rebuilt, there will always be some variables in the motors. Data aside, when we drag raced 3 boats side-by-side, #3, #9 and #10 seemed to be dead even (#3 with a 3-blade prop, #9 and #10 with 2-blades). The 3-blade propeller may have slightly less tendency to capitate in the corners. This does not seem to be an issue for course racing.ĭown river racing is probably more influenced by driver weight where ballast is not carried. Because of the higher rpm the 2-blade was faster out of the hole and had a broader mid-range power band but a 2% lower top speed. The 3-blade propeller dropped the rpm by 800 to 4400 rpm but did not increase the top speed by more than 2%. Both engines topped out at 5200 rpm with the 2-blade propeller. The manufacturer spec for these engines is 6-hp at 4500 rpm with a full throttle operating range of 4000 to 5000 rpm. This past April the Technical Review Committee tested both propellers on two different boats, each with a 1973 vintage 6-hp Evinrude Fisherman engine. Inevitably, questions were raised about which propeller is faster and should both 2- and 3-blade propellers be allowed racing? Several members have purchased 6- and 8-hp engines with stock 3-blade propellers rather than the standard 2-blade propeller.