This is an off line bug but it may cause problems with online more later on.
During off-line more the f4u-1c power plant is absent any power under 160 mph. This includes take -off which makes it amost impossible to get off the ground. After reaching 160 - 180 mph the engine powers up (which is noticed by the sound of the engine rpms increasing.) During on-line mode this problem does not exist. This may occur in other planes, but it is the first that I have noticed.