In every POH, there is 50ft-Obstacle Clear Distance and I wonder where that 50ft is off from.
I thought 3 types of reference point.
- 50ft from Departing Point (where airplane releases brake)
- 50ft from right below airplane (like..... 50 AGL)
- 50ft from the obstacle infront of RWY
Reason I ask this is that RWY is not exact flat, as it has some slope angle, even though angle can be less than 0.1Degree, there must be some altitude difference between Departing point and End of Departure RWY. Therefore I thought, "then... where is the point?"
I tried to find on book and google, but couldn't find.
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