Keep up that sort of thing and you'll have to change your user name.I finally got sick of that and created new .eng files under the brand "Estes_w_adapter" for the C11, D12, and E12 with the mass and length of the adapters morphed in, imported them to OpenRocket, and was back in business.
The clipped tips of the fins on Big Bertha are good for that.This particular rocket has some peculiar design constraints: it needs to sit stably on its fins on display