please have a look at bfx_Ze( ...   Z as a function of elevation

as I have no time know I will respond later to the other issues...

Some other remarks:
did you know that bfx is able to convert most of its outputs, e.g. =bfx_d("cm";.... and bfx_d("moa";..
i do not understand your rationale behind the formula used to calculate the POI?

Cool, nice graph!

When I was involved with Fieldtarget, I found it quite hard to compare measured velocity data of HN FTT pellets with the values of chairgun (BfX did not exist then). What is the situation now?

My quietness has to do with an enormous amount of unfinished business, that seems to have no end.

Mman, did you provide the right link?. From fast reading I got the impression that the article was about terminal ballistics...

Problem fixed!

It took a while as I tried to tie the problem to the upgraded forum software. It appeared however, that my hosting company changed server settings.

Sorry for the problems

currently the bfx site has a problem with downloads. I try to understand the problem.

Quote from: mman on May 18, 2012, 02:12:17 PM
By the way would it be lot of work to include inverse functions to Bfx? For example if BfX_D equals drop for the range of 100 m, inv(BfX_D) would equal range for 10 cm drop? I think some of us would find applications for this.

It is certainly possible, some times a bit tricky. Is bfx_i already not good enought to find the inverse:

Would it make sense to add your and Ians algorithms to BfX - awaiting the time that I have time and energy to a 6dof bfx?

Mman, I have downloaded it, 't looks super.

It was a long time ago since I had build bfx. I have rebuild it to capture any updates of Microsoft.

Brian,

well no. There are no known issues. To check, I have just installed the 32 bit version bfx.xll on windows 7. Furthermore I presume that you follow the instructions on the website. However installing BfX boils down to:

You have to extract the files from the .zip
double click bfxsetup.msi
open excel.
click the file tab
click options
click add-ins
select manage excel addins (default) and then click go
browse to bfx.xll
....

then Excel will load bfx.xll

Well I guess you have to look at the spreadsheet to see what it takes into account: wind, wind flucutions, shooter accuracy, muzzle velocity fluctuations...

Yes I understand, but the simulations show that velocity wins !

Quote from: mman on March 02, 2012, 11:52:09 AM
For past few days I have tried to model sub and supersonic air flow of bullets with CFD. If I can calibrate the model to give accurate results there is no more use to do time consuming and expensive drag measurents.

Cool!

Quote from: mman on March 02, 2012, 11:52:09 AM
No this is exactly in line with the theory.  The main reason to this effect is that wind drift depends on drag coefficient. And this coefficient is lower at subsonic velocities for most bullets. See 22 lr. wind study by McCoy regarding this matter.

True but the faster bullet is less in the wind... If one does a monte carlo, (e.g. what do i shoot today spreadsheet) the higher accuracy prefers a higher velocity. I am going to recheck