I'm working on a super-low budget poster board rocket and I need to make a paper template for the nose cone. (I will be tracing it onto the poster board.) However, the nose cone is 12 inches long, and the Payload bay tradition calculator will not accept a length measurement greater than 10 inches. I tried splitting the template into two parts, but when I cut them out to tape them together, I found that the top curve of the first part and the bottom curve of the second part did not match up, even though they were both supposedly 1.594 inches!
I tried to find other transition calculates online, but to no avail. Is there any other way to make a template like this without doing complicated math that's out of my depth?