It's not just a normal fin(usually placed for stability) it's a control surface, it helps in movement of the rocket within the atmosphere, as the core stage SRB does not have a proper way to gimbal.
SRB hotfire test complete. Engine performance meets nominal parameters. Booster refurbishment and refueling are underway. Stacking operations have commenced; final stack completion is targeted for next week.
SRB hotfire test complete. Engine performance meets nominal parameters. Booster refurbishment and refueling are underway. Stacking operations have commenced; final stack completion is targeted for next week.
Also that's a random ass engine from the FASA mod strapped to a few Oscar fuel tanks with 2 small spherical fuel tanks, I should've gotten restock+ for a more realistic dih with a hemispherical shape on top😭