ZZDrag 1.1.0
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Free Version
Publisher Description
ZZDrag - Compute ballistic coefficients for multiple drag models from bullet dimensions.
The zzDrag app computes ballistic coefficients for multiple drag models by entering critical bullet dimensions measured with a micrometer or obtained from the manufacturer. The most appropriate drag model for the bullet is determined by comparing the ballistic coefficient values over a range of input bullet velocities. The drag model which produces the lowest standard deviation for the computed ballistic coefficient is the model which will most accurately predict bullet flight trajectory.
The following drag models are used by zzDrag in the comparison described above:
G1 drag model - the standard drag model for bullets with a flat base and 2 caliber ogive.
G5 drag model - created for moderate (low base) boat tailed bullets with a 6 caliber tangent nose design.
G6 drag model - created for flat based bullets with a 7 caliber secant nose design.
G7 drag model - created for "Very Low Drag" boat tail bullets with a 10 caliber tangent nose design.
G8 drag model - created for flat base bullets with a 10 caliber secant nose design.
The app will display the best (mean) ballistic coefficient to be used for the bullet based on the velocity range over which is it is to be used. This requires the muzzle velocity and a terminal velocity. For example, if the bullet is to used for 1000 yard target shooting, the velocity at 1000 yards would be used as the terminal velocity. If, on the other hand, it is to be used for hunting deer sized game, the velocity at which the bullet falls below 1000 ft-lbs of energy may be a good choice for the terminal velocity.
The zzDrag app computes the amount of drag contributed by the bullets nose, skin, base, and boat-tail for any of the supported drag models over a range of velocity values. The core algorithms are those developed by Robert McCoy in his McDrag Basic program.
The bullet properties entered once are saved in an internal database for later recall. The bullet dimensions can be entered in inches, millimeters, or calibers.
Bullet stability is computed by zzDrag using the barrel twist rate, bullet properties including plastic tip length and environmental factors if desired. The environmental model used is the ICAO. The standard atmosphere can be used to compute pressure and temperature from elevation, or they can be entered directly in either English or metric units. Bullet stability is shown as the "s" output in the algorithms developed by Michael Courtney and Donald Miller in their paper "A Stability Formula for Plastic Tipped Bullets". S values less than 1 are shown in red as unstable. The "s" value cutoff value for stable is select-able as either 1.3 (bench rest), 1.5 (military), or 2.0 (extreme weather).
All reports can be written as either a csv (comma spaced values) file for import into a spreadsheet program or saved as a PDF (Portable Document File) for viewing on multiple hand-held or computer platforms.
About ZZDrag
ZZDrag is a free app for Android published in the Sports list of apps, part of Games & Entertainment.
The company that develops ZZDrag is ZeekZack. The latest version released by its developer is 1.1.0.
To install ZZDrag on your Android device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2020-10-06 and was downloaded 3 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the ZZDrag as malware as malware if the download link to com.zeekzack.mcdrag is broken.
How to install ZZDrag on your Android device:
- Click on the Continue To App button on our website. This will redirect you to Google Play.
- Once the ZZDrag is shown in the Google Play listing of your Android device, you can start its download and installation. Tap on the Install button located below the search bar and to the right of the app icon.
- A pop-up window with the permissions required by ZZDrag will be shown. Click on Accept to continue the process.
- ZZDrag will be downloaded onto your device, displaying a progress. Once the download completes, the installation will start and you'll get a notification after the installation is finished.
