[stuka_40]

Anybody know how I can make it less dark?

If you have a mod that contains plane folder, find these two folders B-29(multi) and B-29(USA) inside these folder find propellor.mat files open those with notepad
and find this line:
Colorscale 1.0 1.0 1.0 1.0
change the last value to for example 0.6. lower value will give more transparency.

*If you don't have such mod you can create these paths like:
MODS\my_b29\3do\plane\B-29(multi) and
MODS\my_b29\3do\plane\B-29(USA) you can extract propellor. mat file by sfs extractor.