Relation of Weight for Best Gliding Speed
Hi there, my first post! Little background, I'm a pilot studying some flight theory, and came across a question which I honestly cannot answer. The problem goes like this: The pilot wants to increase the range of an aircraft in a gliding flight. If the "optimum" flight speed is 100kt for a weight of 500kgf, and the aircraft is weighing 845kgf, what's the speed it should descend? The answer given to me was 130kt, but I cannot find the relation in these numbers. Any help is kindly appreciated! Thanks in advance.