Patent ID: 7357686

Claim:
A boat propeller, comprising: a hub formed of a first cylindrical member and a second cylindrical member which are detachably joined together, the first cylindrical member comprising: a plurality of first slots; and the second cylindrical member comprising: a plurality of second slots corresponding to the first slots for forming a plurality of receiving cavities with the first slots when the first cylindrical member is joined with the second cylindrical member; and a plurality of insertion cavities formed in the second cylindrical member, the number of insertion cavities being equal to the number of receiving cavities, an end of each of the insertion cavities having a plurality of receptacle members; and a plurality of blades equal in number to the number of receiving cavities, each blade comprising: a blade piece portion; an oval-shaped insertion portion connected with an inner end of the blade piece portion, the oval-shaped insertion portion being inserted into one of the receiving cavities when the first cylindrical member and the second cylindrical member are joined together; and an adjustment member formed on the oval-shaped insertion portion, a tip of the adjustment member comprising a positioning member such that the positioning member makes contact with at least one of the receptacle members when the adjustment member is inserted into the corresponding insertion cavity; wherein the positioning member of the adjustment member is selectively matched with one or more of the receptacle members for adjusting a pitch of the blades.