I have some RB3d problems.
1. Squad members seem to crash mid mission for no reason.
2. I noticed the game is in 8 bit colors. Can this be raised to 16 or 32 bit?
3.The frame rate is fairly poor.
#1 Are you using a mod such as Hell's Angels or Revenge of the Jastas? If so, squad members happen when you don't have preferences set to full authentic. The mods have modified Flight Models and they are only for Full Realism settings (torque, flight model, g-forces and such). If settings are not set, squad members will cash constantly. If your game is stock, not sure why, but i would try setting preferences to Full.
#2 Yes RB3D is only 8-bit/256 colors. Under Glide Graphics and the right combination of mods, it can look quite good. For terrain, I prefer Promised Land 2 Terrain.
Here is a former post of mine that has Glide Wrappers, files that can bring Glide graphics to modern computers. http://www.gog.com/en/forum/red_baron_pack/q_lots_of_questions_on_red_baron_redux_and_glide_wrappers/post3
#3 Most folk with today's computers have problems with the game going to fast and use the mods to slow it down. GoG has included a little program called SetSpeed in the RB3d folder. I believe GoG has it reset to something like 60%. Just crank it up to 100% and then add mods till it smooths out.