10-20-2021, 12:31 AM
-300 elev, hmmm. Interesting.
Actually not totally sure, the only -300 places I know of, are very dry desert and hot. So really dry air, maybe slight density increase, also pretty hot most of the time? So less dense...
But then again, maybe below sea level at above -300 but maybe humid (tropical), however humid air is less dense than dry air... so not sure how all of those would play out. Sorry for the digression.
But...
I had never considered BC effects below sea level, but lo and behold my little calc will go down to -100.
So this is mostly an estimate using extrapolation. Also, note that humidity is not a part of this particular calculator.
Using the 2375, recall the 600 yd, +300 msl was 1385 fps.
At 0 msl, it calcs 1377 fps.
At -100, it shows 1374 (ke = 516).
I don't have this graphed out but it should stay above your min of 1320, probably around 1365+/-... more so especially if you look at starting MV's around 2400, which gives you a bit more wiggle room.
Actually not totally sure, the only -300 places I know of, are very dry desert and hot. So really dry air, maybe slight density increase, also pretty hot most of the time? So less dense...
But then again, maybe below sea level at above -300 but maybe humid (tropical), however humid air is less dense than dry air... so not sure how all of those would play out. Sorry for the digression.
But...
I had never considered BC effects below sea level, but lo and behold my little calc will go down to -100.
So this is mostly an estimate using extrapolation. Also, note that humidity is not a part of this particular calculator.
Using the 2375, recall the 600 yd, +300 msl was 1385 fps.
At 0 msl, it calcs 1377 fps.
At -100, it shows 1374 (ke = 516).
I don't have this graphed out but it should stay above your min of 1320, probably around 1365+/-... more so especially if you look at starting MV's around 2400, which gives you a bit more wiggle room.
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