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Question

A taxiway designed for subsonic aircraft has the following characteristics :

(i) Wheel base = 16 m

(ii) Tread of main landing gear= 6.5

(iii) Turning speed = 45 kmph

(iv) Coefficient of friction between tyre and pavement = 0.15

The absolute minimum turning radius will be _______ m.
  1. 120

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Solution

The correct option is A 120
(i)Turning radius, R = V2125f=452125×0.15=108m

(ii) From Horonjeff's equation, R = 0.388W2T2S

Here, W = 16 m

T = 22.5 m

S=6+6.52=9.25m

R=0.388×16222.529.25=49.644m

(iii) Absolute minimum turning radius for subsonic aircraft regardless of any speed = 120 m. Selecting maximum among three cases discussed above, so turning radius = 120 m

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