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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Small RC helicopters fly on average from 7-10 minutes. Medium sized helicopters fly from 9-12 minutes. Giant helicopters fly from 12-15 minutes. We carry spare batteries for most of our RC helicopters which can greatly increase your flying time.