Isolated Masonry Piers 1. You may use hollow core concrete masonry units (concrete blocks) to build isolated masonry piers if the units are at least (â¥) 8 inches thick and not longer than (â¤) 3 times the unit thickness.
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From Wikipedia, the free encyclopedia. The Boeing Chinook is a tandem rotor helicopter operated by the Royal Air Force (RAF). A series of variants based on the United States Army 's Boeing CH-47 Chinook, the RAF Chinook fleet is the largest outside the United States.n March 1967 an order was placed for fifteen Chinook HC Mk1s, standing for Helicopter, Cargo Mark 1, for the Royal Air Force to replace the Bristol Belvedere. This original MK1 variant was to be based on the CH-47B but the order was cancelled in a review of defence spending in November 1967.