So here is a link to download the original MS Excel spreadsheet for Nose Cone Design.
I use a modified version myself to plot shapes that resemble long range target projectiles. If I can do it I’m sure those of you some knowledge of spreadsheets can come up with their own modified version. Follow the instructions and enjoy!
So if you’ve managed to magnify the outline of your ogive, effectively you can calculate the radius by measuring the meplat to the shank/ogive intersection. This will become your chord length W.
The Sagitta of the arc or height (H), is measured perpendicular from the midpoint of the chord W.
For double or multiple radius ogives there will be multiple chord lengths measure. Note also this method only works with ogives using a tangent and secant radius. The larger your outline is magnified the more accurate your measure will be, useful for those of us without an optical shadowgraph comparator or other such metrology equipment. Remember though you may have to contend with the parallax error depending on how you capture your image outline.
Precision gilding metal match grade target jackets
+99% Lead (Pb) cores
Hand swaged in Australia
The G7L series of projectiles is Antipodean Industrial’s entry into the hand swaged projectile market. In principle, the G7L is a traditional long range (300y+) projectile designed for high levels of accuracy while maintaining supersonic velocity levels.