Sorry it took so long to get back,but had to finish a bunch of props so people can bang up them up this weekend and i can do it again next week
.Anyway to answer some questions,no it does'nt add weight by having tips because you have to reduce dia. when you tip because if the increased loading of the prop,other wise if you tip at dia. you will overload the engine because of the increase in efficiency of the prop.How tipped props work is by tipping you eliminate or greatly decrease tip vortices,for as water comes off the tip it creates vortices which draw water off of the suction side and the pressure face,so if you can stop this you create more suction on the suction side which in turn creates more pressure on the pressure side which creates more efficiency. The benefits are more thrust straight back,improved handling,decreased fuel,more overall boat lift, not transom or bow but overall more lift all of which leads to go speed. So in a nutshell you decrease your slip.I do have Krees's papers and the Railton&Kamen papers i will dig them out(Doug Railton used to spend a great deal of talking to my dad Bob Kilian and myself at Pitchometer Propeller years before any papers were written)trkilian@yahoo.com 510-357-3480
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