Mk2 Drone Core is causing massive drag to the part behind it. (pre 1.9 origin)
I believe this issue has been around for a while. Someone on twitch told me about it.
Pictures show massive drag if the mk2 Drone Core is a part of the vessel compared to if it isnt.
#4 Updated by [email protected] about 1 year ago
This problem exists in version 1.3.1, and probably since the beginning of the 1.05 drag model. The mk2 drone core has holes that extend from front to back, so KSP treats it like smaller-cross-sectional-area part in the stack of other mk2 parts.
One workaround is to change two 2.0-m² areas into 2.5-m² areas like the other mk2 parts with a Module Manager patch:
cube = Default, 0.378,0.565,1.355, 0.378,0.565,1.355, 2.495,0.963,0.212, 2.495,0.963,0.212, 0.610,0.901,0.7, 0.610,0.901,0.7, 0,0,0, 2.5,0.25,1.5