FearNoWind
Well-Known Member
Just plan your shots to run along the longitudinal plane and you don't have to worry about Coriolis force.
Got it. I think the Horizontal deflection equation is incorrect.
I dont' fully understand how you are integrating the equations into the code, but i think it should be:
- Horizontal - Only dependent on your Latitude. Has maximum deflection at the Poles. - Horizontal Deflection = Ω* X * sin(Lat-inc) * tof
Ω = 0.00007292 rad/s (rotation rate of earth)
X = Range
Lat = Latitude
tof = Time of Flight
inc = shot inclination
No, shot inclination is separate. We don't use the improved rifleman's rule, or rifleman's rule. We use a function of Mach vs. Drag. So that the rate of drop of the bullet at distance is properly accounted for in the formula. We do not just scale the trajectory, we actually take in to account the physical affects of uphill vs downhill. This is covered in Chapter 4, page 53 of Applied Ballistics for Long Range Shooting Third Edition by Bryan Litz.
A lot of this is over thinking. Most shooters will not be able to differentiate the minor horizontal effect of Coriolis vs wind call. This is really only important for shooters who need 1st round accuracy. If you get sighters, it wont affect you.
I agree with all of this but I think the rifleman's rule and inclination effects on trajectory are completely exclusive from horizontal Coriolis deflection. I also agree on the the overthinking.
But my motivation is in fact 1st round accuracy!
At the end of the day, shooting long range is a big math problem that would be impossible without a shooting app... so why not start out with the app providing the most accurate solution possible for the 1st shot?
I also get that I could learn a lot from your 3rd edition Applied Ballistics book. I'll go ahead and buy the book and read up, and maybe it will shed new light to disprove my train of thought.
But maybe there's a small chance that a ballistics novice like myself has found a small hole in a rather insignificant part of the Horizontal Coriolis equation? Maybe run this by Bryan... worst case is you get a good laugh at my expense.
But maybe there's a small chance that a ballistics novice like myself has found a small hole in a rather insignificant part of the Horizontal Coriolis equation? Maybe run this by Bryan... worst case is you get a good laugh at my expense.
Been there done that with my ballistic software. I researched coriolis drift to gain an understanding of the concept and its application. In the process, I located and reviewed mathematical equations expressing coriolis drift. Lo and behold, I found an error in my ballistics software. I contacted the author/programmer of the ballistic software and provided him with web links to the articles and the math/equations. He looked it over and agreed with the need to revise his algorithms. Then released an update to the software, correcting the error.
I haven't reviewed the mathematical equations you're currently studying. But having reviewed the theory and the governing mathematical equations several years ago, I believe the concepts DocUSMCRetired and I presented in this thread to be correct.
These items are separate from each other, and our software calculates them separately. But they are included in the final firing solution. While Coriolis, and inclination are effected by time of flight independently, they are also calculated independently.
I think you are over thinking this. Since they are independently calculated the tof(or distance) are correct for each variable.