Originally Posted by
ToiletDuck
I'm not freaking out I'm just curious about the math. I used 2*pi*r where r=13dme and I keep getting an answer of 20.42miles
90/360=.25 Therefore after plugging in my numbers to the above equation and making sure to add the (90/360) for the dme degrees it looks something like this. [2(3.14159)][13(.25)]=20.42nm. We are about 6miles difference is a lot. 42% off.
Part of your problem is you keep using 90 instead of 70 degrees, which was the original problem. When I do it using the correct numbers and a calculator I come up with 15.8 miles. 2(3.14159)(
70/360)(13).
Check your numbers next time bub. So my estimate of 14 miles aint that far off, is it? And I didnt have to do any math involving greek letters. Takes just a couple of seconds of mental math. Sheesh, relax...you're making it way to hard on yourself. You're not going to whip out tangents and cosines when they ask you to figure a VDP or a descent for a crossing restriction, are you?