off lengths in a sentence

1. Nearby, sawed-off lengths of cactus are stacked like firewood.
2. Because of the terrain to the east the maximum take-off lengths on the runway vary depending on the direction : it is only from the east compared to from the west.
3. It is part of a ?4m plan which will also include resurfacing of the runway during summer 2008 and the extension programme that will commence in spring 2008 and is due to be completed by December 2009 . It has emerged that the actual runway take-off length was underestimated by 160 metres in the ?.5 million feasibility study.
4. It's difficult to find off lengths in a sentence.