I'm a BB user, and have the GunSim app. My question is this: Inputs are temp/atmospheric pressure/humidity/altitude/density altitude, plus the usual wind/declination/target spd/etc. If I input temp/atmospheric pressure/humidity, that should be sufficient for the necessary ballistic calculation right? Do I leave altitude and density altitude at 0? Density altitude is a function of those 3 inputs. Any help would be much appreciated as I'd prefer not to have to pack around unnecessary electronics.
GunSim Inputs
- Thread starter essquires
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You should at least put your altitude in as this is quite important when it comes to ballistics at different elevations.
If you do not know the density altitude then skip that one, if you do have it though (perhaps you have a Kestrel with that function) then the calculations will be that much more precise.
If you do not know the density altitude then skip that one, if you do have it though (perhaps you have a Kestrel with that function) then the calculations will be that much more precise.
http://www.gunsim.com/mobile/blackberryHelp.html
Q: When do I input Altitude?
A: If you know your actual air pressure, you can set Altitude to zero. If you have the weather map pressure (which is the sea level value), you enter altitude and the program adjusts to the height you are actually at.
Q: When do I input Density Altitude?
A: If you know your Density Altitude (from a meter, such as a Kestrel), you don't have to type in pressure, temperature or humidity. Ballistics programs use pressure, temperature and humidity simply to calculate the air density.
If you know the air pressure at your location, you leave it at zero.
http://www.gun-blog.com/2011/04/two-kinds-of-pressure.html
"Density altitude is a function of those 3 inputs." Exactly.
Weather report pressure is adjusted for sea level.
The software calculates what the air pressure should be at your height.
If you have a Kestrel, cut out the middle man and use the local pressure.
Density Altitude: http://www.gun-blog.com/2011/05/density-altitude-and-ballistics.html
6,000 posts? I could have built a house in that time, OMG.
Thanks guys. That makes sense. Atmospheric pressure as reported by Environment Canada is adjusted to sea level at a standardized temp and humidity (59 deg F and 78 % humidity I think) to ensure that low/high pressure readings mean the same thing (weatherwise) at different altitudes right? So, the key inputs are temp/corrected pressure/humidity and then altitude to bring the corrected pressure to absolute pressure. Did I miss anything in my sum up?
- Location
- Edmonton mostly
I recently installed this app, should be fun to see if it helps my coyote at 1000 yards project.
That's it, if you are using sea level pressure you type in altitude, temp and humidity.
