Originally Posted by Mikecr
Where do we get RT/R?
Mikecr, good question!
I will tell you how I do it.
I know is a value between 0.5 and 1.0 by studying the bullet diagrams on
Bryan Litz's book, I can get pretty close at guessing the number. I have tested
my self and as the book states it, it can easily be done. It also states
how difficult it is to calculate it. You might find some info. on line that would be
useful. What we need to keep in mind is that we don't have a whole lot to
err with, we'll go from 0.5 to 1.0 being 1.0 perfectly tangent ogive radius.
By looking at the bullets diagrams and seeing their Rt/R ratio values and how
they change in value as the bullet ogive changes you get a pretty good idea of
what you're doing.
I know I'm not giving you what you want to hear, but with a bit of practice
one can really get close to calculating them BC7s.
There is a whole lot to learn about that stuff!