I am trying to draw a fin for my final year project, but I could not fully understand the technical drawing explanations that I marked with red markings.
especially R1.281 DEFINES TANGENCY OF R1.312 WITH FIN SURFACE, I couldn't understand the part. My goal is to make a "bubble fin holder" like in the last picture. I'm also wondering how we can draw this part of fin . high resolution image is here https://i.imgur.com/OmEKV7J.jpeg