Bell 525 Relentless vs Enstrom 480b vs Piaggio Avanti Evo vs Robinson R66

The Bell 525 Relentless is a super‑medium, twin‑engine helicopter aimed at offshore and corporate missions. It generally offers the longest range of the helicopters in this set (roughly in the 500–600 nm class, configuration dependent) and the highest typical passenger load, commonly around 12–16 seats depending on layout. The Enstrom 480B is a light, single‑engine piston helicopter primarily used for training, utility, and personal flying; its range is comparatively modest (often a few hundred nautical miles) and capacity is typically five seats including the pilot. The Robinson R66 is a light, single‑engine turbine helicopter positioned above the 480B for speed and payload; it usually seats five and offers a similar or slightly greater practical range than many piston lights (often around the mid‑300 nm class). The Piaggio Avanti EVO is not a helicopter but a twin‑turboprop, pressurized fixed‑wing aircraft; it typically carries 7–9 passengers (plus crew) and delivers by far the greatest range here (commonly well over 1,000 nm), making it the standout for longer point‑to‑point travel.