Quote from: meccastreisand on September 24, 2014, 11:49:10 PM

When you click on the excel file at the download share it'll show you an image of the spreadsheet. At the top will be an open link and an arrow pointing downward that will download it for you.

Thanks, I finally got it downloaded, but I've revised it and haven't found where Cd is calculated. Please could you tell what tab is or where I should look in?

Quote from: 375CT on September 23, 2014, 08:37:13 AM

Quote from: meccastreisand on September 22, 2014, 10:23:23 PM
I think I have basically what you're looking for buried in some hidden tabs on my Ballistic_XLR workbook.

you can download it at Ballisticxlr.com. If you need detailed info on it you can get in touch with me there too.

For some reason I cannot download your workbook. Google raised an error message, so please can you check?

So, you say that from downrange velocities, you can calculate Cd (for any G function) ? Am I right?

Thanks in advance for any help!

When you click on the excel file at the download share it'll show you an image of the spreadsheet. At the top will be an open link and an arrow pointing downward that will download it for you.

Quote from: admin on September 23, 2014, 01:21:22 PM
I think I have missed this request.

On my downloads page you can download a workbook, here a screen copy.
http://www.bfxyz.nl/pics/bcfromvelocitysimplelarge.PNG
It uses velocity measurements at several distances, yet one can apply the same method to a single measurement.
Yet the more measurements (at the same or different disatances) the better the results/

Alternatively you might post your data and I reply with an excel document that does the job.

Robert, thanks for the graph. I don't have any measurements yet, but if you can tell me how to do the spreadsheet I can try. Any help, much apprecitated for sure!

I think I have missed this request.

On my downloads page you can download a workbook, here a screen copy.
http://www.bfxyz.nl/pics/bcfromvelocitysimplelarge.PNG
It uses velocity measurements at several distances, yet one can apply the same method to a single measurement.
Yet the more measurements (at the same or different disatances) the better the results/

Alternatively you might post your data and I reply with an excel document that does the job.

Quote from: meccastreisand on September 22, 2014, 10:23:23 PM
I think I have basically what you're looking for buried in some hidden tabs on my Ballistic_XLR workbook.

you can download it at Ballisticxlr.com. If you need detailed info on it you can get in touch with me there too.

For some reason I cannot download your workbook. Google raised an error message, so please can you check?

So, you say that from downrange velocities, you can calculate Cd (for any G function) ? Am I right?

Thanks in advance for any help!

For my purposes as a recreational shooter altitude matters only insofar as I may climb or descend while out in my area of operations. It might be hunting or just poking at steel but altitude still has to be accounted for in my shooting solutions occasionally.

My own Excel spreadsheet (ballisticxlr) has extra data on it that's meant to deal with variations of air temp, air pressure, ammo temp, etc... for that reason.

I think I have basically what you're looking for buried in some hidden tabs on my Ballistic_XLR workbook.

you can download it at Ballisticxlr.com. If you need detailed info on it you can get in touch with me there too.

Folks, I wonder if someone has the equations to compute Cd (coeff of drag) from observed downrange velocities.

I know how to do that with BCs, now I'd like to know how to do the same for Cd. Any help is much appreciated in advance.

Years ago I was puzzling with these matters, should altitude be a paremeter?
Yet it is much easier to measure pressure and calculate the density from it. Hence I removed the altitude parameter.

Clearly one can study the sensitivity of a path to atmospheric conditions via BfX_C. Yet, in al those years I have used BfX, I seldom used it. And, if so, mostly for rather academic purposes, to develop an intuition.

Some of the guys on the forum, shooting long range in Australia and Finland, at extreme temperatures, might be devoted users.

Measuring pressure certainly does not require devices that exceed 20 Euro's. For that price I have a electronic weather station over here (not measuring wind speed)

Furthermore, I think that the influence of temperature on the burning of the powder might cause more deviation  than through density fluctuations. However, I am not able to do te calculations. The aformementioned forum users keep their amunition in a  coolbox. In Finland to keep them warm, in Australia to keep them cool 

Thanks for the compliments,

Fine that you managed to install. I certainly wouldn't be able to help you with XP and Office 2003 anymore.

Robert