I found a situation where my F21 would not get to plane this weekend.
I had both tanks full, 7 guys in the boat, one in tow. Being conservative, the average weight of each passenger was 180lbs.
Total weight (ballast) = 3240
All 7 passengers were in the cabin of the boat. I take off and the boat is just staying at about 14mph (GPS reading). I stopped the boat and moved 2 guys into the bow. The boat finally planed after a long time.
Has anyone else had this issue? I may have that many guys in the boat in the future and would hate be under propped. I don't know what pitch the 4 blade I have is, but it is from the factory.