Earlier today, a series of puzzles related to engineering challenges were posed, and here are their ingenious solutions.
Cranberry Sorting Innovation
In a facility tasked with sorting cranberries, a challenge arises in distinguishing between good and bad berries. The former is firm enough to bounce, while the latter are not.
Solution: An angled board is employed so that firm cranberries bounce off onto a conveyor belt for collection, whereas the soft, unsellable ones fall down into a disposal container.
Understanding Child-Resistant Caps
Child-resistant bottle caps in the U.S. are designed to be effective against 85% of children under five years of age. The question arises as to why this percentage isn’t higher, considering the safety of young children.
Solution: A 100% effectiveness rate would likely make the caps difficult to open for adults with weak or arthritic hands, potentially prompting them to leave bottles open. The 85% standard is a compromise to prevent increases in risk from unsecured containers.
Unexpected Effects on the Golden Gate Bridge
In 2020, modifications were made to the pedestrian handrail of the Golden Gate Bridge to improve its wind resistance. The previous handrail structure was replaced with narrower, vertical slats.
Solution: This change resulted in increased wind levels on the bridge, annoying cyclists, and under specific wind conditions, caused the bridge to emit a loud whistling sound, acting like a massive harmonica.
Groundbreaking Aircraft Testing
During the early 1950s, several aircraft experienced catastrophic mid-flight failures due to structural pressure issues. British manufacturer de Havilland devised a safe method to test the Comet’s airframe.
Solution: The engineers submerged the aircraft in a large water tank. Pressurising the cabin with water allowed them to safely test structural limits without the risk of an explosive air release that would have obliterated potential evidence.
These solutions illustrate the innovative thinking integral to engineering and safety design, adapted from the book “How to Keep a Plane in the Sky” by Alex Davies. The book highlights intriguing stories from the world of test engineering, crucial to the reliability of modern technology.
Reporting based on coverage first published by theguardian.com.