11. In some areas there are vertical faces of over with very steep slopes at the base. 12. The Crested Wren's fuselage was a plywood-skinned hexagonal structure, its vertical faces longer than the others. 13. The upstream vertical face arch radius is. 14. Silled windows set into the vertical face . 15. "I drove into a deep culvert, hit a vertical face square on and stopped suddenly, " he added. 16. One is described as being five-sided, but with three of the sides forming one almost flat, vertical face . 17. The design includes a turfed incline which slopes downward to a sharply vertical face , typically a masonry retaining wall. 18. In the columnar structure, the units are similar to prisms and are bounded by flat or slightly rounded vertical faces . 19. A spectacular road, known as Chapman's Peak Drive, hugs the near-vertical face of the mountain from Hout Bay to Noordhoek. 20. The group decided to abseil down the vertical face ( the great rock barrier ) to the base of the mountain.