PPRuNe Forums - View Single Post - Distance Between Two Planes With Different Turn Radiuses
Old 21st Mar 2010, 22:39
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Badmachine
 
Join Date: Jul 2008
Location: Las Vegas, NV
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Thanks Capt. Pit Bull.

Your helpful equations seem to make sense. Was surprised at how little distance is generated by two high speed aircraft (traveling at 799f/s) and turning with a angle of bank (AoB) difference of 5 degrees between the two (assuming my calculations are correct).

By the way ...

Is there a way to calculate the separation distance, if each aircraft begins the type of turns discussed, but at different times? (for example, a turning delay of 5 seconds between each aircraft)

Traveling nearly a mile, the separation distance between two high speed aircraft is only 41 feet.

T = speed*time/circumference of turn.

Aircraft A: 20 degrees AoB: (r: 54,795); [(799)5/344,287]*360 = 4.17

Aircraft B: 25 degrees AoB: (r: 42,771); [(799)5/268,738]*360 = 5.35

Aircraft A:

Xa (20 degrees AoB)= 54,795 - (54,795 * Cos (4.17)) = 145
Ya (20 degrees AoB) = 54,795 * Sin 4.17 = 3985

Aircraft B:

Xb (25 degrees AoB)= 42,771 - (42,771 * Cos (5.35)) = 186
Yb (25 degrees AoB) = 42,771 * Sin 5.35 = 3988

Xseperation = Xa - Xb
Yseperation = Ya - Yb

Xseperation = 145 - 186 = -41
Yseperation = 3,985 - 3,988 = -3

Seperation = square root of ((Xseperation^2) + (Yseperation^2))

(-41)^2 + (-3)^2 = 1690^1/2 = 41
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