[GetReel]

Well the IB prop questions never get fully resolved and its slow at work....most of the wheels run are 16 as Don stated. I tried a 17 and its too close to the prop pocket hull walls and REALLY loud prop rumble that is a headache, although the boat moves better. The 16 is about 2" off the wall and the max diameter you can probably run without an earache. If you are getting 18 @ 3000, thats about average with a full load. My question is what are you running at 3250?...I get about 21.5 @3250 with decent load with a 16 x 17 4 blade 5* cup. Thats the best you can hope for unless you start again with a smaller wheel and way more pitch...not sure you will get more speed, but may reduce the prop rumble. THe Blackfin offset is great until you loose an engine and then run in a circle, assuming you have twins.