Originally Posted by airraptor

The APC 18x6W produces about 17,8 pounds of thrust at sea level on a standard day on the ground. So as you get moving say 30 mph you are down to 12 pounds of thrust and 60 mph you around 4 pounds of thrust if the engine stays at the same 8000 rpm. With this prop I think you will see around 10,500-11,000 in the air at full power and producing around 8-9 pounds of thrust.
.