Airbus Helicopters H225 vs Beechcraft King Air 360 Er vs Bell 525 Relentless vs Piper M600 Sls

The Airbus H225 and Bell 525 Relentless are large, twin‑engine helicopters aimed at offshore, SAR, and executive lift, while the Beechcraft King Air 360ER and Piper M600 SLS are fixed‑wing turboprops geared toward business and utility travel. For range, the King Air 360ER generally leads among these, designed for extended endurance and long legs in the several‑thousand‑nautical‑mile class depending on payload and reserves. The Piper M600 SLS is shorter‑range, typically around the low‑thousand‑nautical‑mile class, optimized for owner‑pilot simplicity and speed rather than maximum endurance. The H225’s helicopter range is usually in the few‑hundred‑nautical‑mile class with typical mission payloads, while the Bell 525 targets similar medium‑range helicopter missions, often somewhat higher than many legacy helicopters but still well below fixed‑wing turboprops. For passenger capacity, the H225 is the largest, commonly configured around 16–19 passengers (higher in dense layouts). The Bell 525 is smaller, typically around 12–16 depending on configuration. The King Air 360ER usually seats about 8–11, and the M600 SLS typically 4–6.