At first glance, a helicopter with two offset, intermeshing rotors looks like it’s breaking the laws of geometry. The blades sweep through each other’s airspace at high speed—so why don’t they crash into each other? These aircraft are called synchropters (also “intermeshing rotor helicopters”). The design was pioneered by Anton Flettner in the 1930s and is still used today by companies like Kaman. Here’s the trick 👇 1️⃣ The masts are tilted outward Each rotor mast leans away from the centerline. This creates two slanted “rotor discs” that overlap in space but never in the same height plane. Even though the blades look like they’re crossing, their physical paths are vertically separated. 2️⃣ Each blade’s motion is phase-locked The two rotor systems are connected through a synchronizing gearbox. Think of it like two gears meshing: if one rotor rotates, it forces the other to rotate with the exact same timing. ➡️ Result: the blades are always 90° out of phase, so their positions rela...