Because there are so many applications for propellers lets keep this to propellers on 180/200HP piston singles.  Why, Are some like the one on Piper Arrows 2 blade wide square tip?  Do the 3 blade hartzells have very pointy tips? Is the tried and true mooney 201 2 blade Macauley elliptical tip considered by most to be the best all around prop? Is the scimitar the thing on almost all new design propellers?  Are there all kinds of power/rpm restrictions on aluminum pr