Does the 701 calculate Density Altitude?
Thanks
Thanks
So if I manualy put in humidity, it will work out DA?
Pressure temp and humidity is DA. It just doesn’t tell you what the DA is. If you want a quick formula to guesstimate what your DA is use this: every 15 degrees Fahrenheit above or below standard is a 1000’ increase/decrease in DA. So for example it’s 74 degrees at sea level, that’s a 1000 ft DA (NOTE that this does not consider pressure changes when calculating DA but it gets you close enough)Hi Doc
If it doesn't use DA, does that mean DA is not that important for AB to calculate drops?
Pressure temp and humidity is DA. It just doesn’t tell you what the DA is.
Okay, now I get it, I read the manual and did not quite get it.
So AB on the 701 is using DA, but you just cant see it.
No problems.
Thanks
Mark
It's really not. Mess with the numbers. Your drop won't be affected unless there is a change in da of a bare minimum of 500 ft, reality more like 1k. Temp is the biggest factor, but that's because it changes velocity as well as your DA. it takes 15 degrees to change da by 1000 ft, what do you think 15 degrees does to your velocity? So is it not accounting for increased velocity or a change in da that caused your miss?Resurrection this thread not because of DA but the fact that the 701 station pressure is off by 0.11inhg compared to two kestrels meters. The kestrel metes are within 0.02inhg of each other.
SP being off that much with the 701 is going to cause some vertical issues at distance.
Humidity has the least effect on DA. I set mine at 50 and leave it as well. The variation between a kestrel and Garmin isn’t a formula, it’s the sensitivity of the barometer measuring pressure.I run a 701 and was wondering the same thing, and then this thread pops up. Good to know.
I left Humidity at 50% and use a temple sensor for temp. With the CDM for my round I've had good luck making first round hits at 1k + with my 6.5 CM.
@DocUSMCRetired does the Kestrel 5700 elite w/ AB do this calculation differently using DA? Or is the math done the same way?
It's really not. Mess with the numbers. Your drop won't be affected unless there is a change in da of a bare minimum of 500 ft, reality more like 1k. Temp is the biggest factor, but that's because it changes velocity as well as your DA. it takes 15 degrees to change da by 1000 ft, what do you think 15 degrees does to your velocity? So is it not accounting for increased velocity or a change in da that caused your miss?
4K yards?
ive got to say that if a 90 ft elevation change cases your drop to double something else is afoul. Besides, that deep into subsonic who knows what’s actually going on. In addition, AB won Ko2m using a foretrex before it ever went public so I’m just guessing there is no isssue.I normally do all my simulations out to 4K yards cause that’s what the 701 is going to be used for.
I guess I looked at the numbers and thought it was more dramatic. Either way 0.11inhg error contributes to 50” of vert uncertainty where as a 0.02inhg contributes to a about 28” of vert uncertainty.
ive got to say that if a 90 ft elevation change cases your drop to double something else is afoul. Besides, that deep into subsonic who knows what’s actually going on. In addition, AB won Ko2m using a foretrex before it ever went public so I’m just guessing there is no isssue.
Maybe the kestrel is the one that is off? It’s a man made device that has an error factor to it. The tolerances aren’t zero on either device.who cares? It’s an accountable uncertainty and I pointed it out. The pressure sensor is off. Stop trying to turn it into something else.