Sounds like your airplanes are too sensitive to the touch due to very high FPS. Two things can fix the problem.
Wulfc: Hmm... interesting... I was ready to put this down to my own inability to fly the thing, but you may have something - but in the wrong direction! I already installed HASP, and now FRAPS is reporting I'm only getting about a dozen FPS at best! It doesn't seem to matter what I do, either, even a smaller screen resolution doesn't help. Playing around with dgVoodoo seems to make no difference either, although I don't really know what I'm doing there! I just followed instructions in this forum... I will have to try a reinstall, and suffer the basic textures, at least for a test. D3D mode just doesn't work at all, the graphics look dreadful.
That constant framerate report from FRAPS worries me - it's just a bit TOO constant...
EDIT: on further testing, I just don't believe the FRAPS framerate. The screen is too smooth to be only 12 fps or less. It's not excessively high, but it's not THAT low...
alt+f gives the RB3D's in game version of the FPS. The reason say "version" is every time I use it, it does match what FRAPs reports, but FRAPs shows a 10-12 FPS hit in the process.
Since you are using a mod, you need to set the FM to full authentic. That means G-Force Effects to ON, Torque Effects to ON, Flight Model to Authentic, and for SP, Enemy skill factor to Max.. The mods were only modded to the authentic flight model, not the easy settings. Entire squadrons of AI pilots will crash on take off on easy mode.