🔍 Key Concepts

• Load radius and how it changes when a crane boom is lengthened • How moment (load × distance) affects crane stability and safe working load • Why crane load charts show different capacities for different boom lengths and radii

💭 Think About

• When you lengthen the boom, what happens to the horizontal distance from the crane’s center of rotation to the load (the load radius)? • If the radius gets larger, does the crane experience more or less overturning moment for the same load weight? • Given more or less overturning moment, would the safe working load (lifting capacity) have to go up, down, or stay the same to keep the crane stable?

✅ Before You Answer

• Check how safe working load changes on a typical pedestal crane load chart as boom length and radius increase • Be clear whether you’re thinking about the same radius or an increased radius when the boom is lengthened • Verify that your choice matches basic stability and tipping moment logic: longer lever arm = what effect on allowable load?