Bell 525 Relentless vs Cessna 208b Grand Caravan Ex vs Leonardo Aw189 vs Robinson R66

The Bell 525 Relentless and Leonardo AW189 are large, twin‑engine helicopters in the “super‑medium/medium” class aimed at offshore and corporate missions. They generally offer the longest reach of the rotorcraft here, with typical ranges in the roughly 450–550 nautical mile class (mission and reserves dependent), and cabin layouts commonly around 16–19 passengers in high‑density configurations (often fewer in executive layouts). The Robinson R66 is a light, single‑engine helicopter optimized for cost and simplicity rather than heavy lift. It typically carries about 4 passengers plus a pilot and has a shorter practical range, commonly around 300–350 nautical miles. The Cessna 208B Grand Caravan EX is not a helicopter but a single‑engine turboprop fixed‑wing utility aircraft. It usually seats about 9–14 passengers depending on configuration and, as a fixed‑wing platform, tends to deliver longer stage lengths and better cruise efficiency than the helicopters, often around 800–900 nautical miles with typical reserves and payload assumptions.