Reply To: Fins deform after joining.
applying location, rotation or scale is not the same as using them…
1. with the n panel open check to see if rotation values are all at zero and scale values are all at one…
2. if they are not then (with the fin object selected) using ctrl + a open the pie menu to apply these values…
an alternate to this is to pull down the object menu in the header and find apply and select location rotation or scale…