What should be the climb gradient, if during take off an obstacle of 1000 feet height, at a distance of 2000 metres from the end of TODRH, needs to be cleared by the required statutory height?
Refer to figure.
1. The statutory obstacle clearance is 35 ft.
2. The required change in height is 1000 ft, because the helicopter will already be at 35 ft at the end of TODRH. This will give the necessary clearance.
3. The climb gradient is:
- Climb Gradient = (Change in Height x 100) / Distance travelled
- Climb Gradient = (1000 ft x 0.305 x 100) / 2000 m = approx. 15%.
Note: 1 foot equals to 0.305 metres.
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