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Bell 212 / 412 Huey II

Bell · Utility/Transport · USA · Cold War (1970–1991)

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The Bell 212 / 412 Huey II is the twin-engine evolution of the Bell UH-1 'Huey' family, developed by Bell Helicopter (now Bell Textron) for civil and military operators. The Bell 212 entered service in 1970 as the twin-engine successor to the UH-1H Huey. The Bell 412 followed in 1981, swapping the original two-blade rotor for a four-blade composite design. The 'Huey II' designation covers a Bell upgrade programme that converts existing UH-1H airframes to twin-engine 212 / 412 standard for international operators. As of 2026, the type remains in active service with the U.S. Marine Corps (UH-1Y Venom), foreign militaries, and civil operators worldwide.

Dimensions run to 57 ft (17.4 m) in length with a 48-ft (14.7 m) main rotor diameter. Empty weight is around 6,200 lb and maximum take-off weight is 11,200 lb. Power comes from two Pratt & Whitney Canada PT6T-3B Twin-Pac turboshafts producing roughly 1,800 shp combined on the Bell 212, or PT6T-3D / PT6T-9 engines on Bell 412 variants. Top speed is around 161 mph, range is 273 nmi, and service ceiling is 17,000 ft. The cabin accommodates 14 passengers plus 2 crew, or up to 5,000 lb of internal cargo plus an external sling load. The Bell 212 retains the two-blade main rotor of the UH-1H; the Bell 412's four-blade composite rotor cuts vibration and improves payload performance.

The platform's core mission is medium utility transport. Specific roles include: (1) offshore oil-rig support; (2) emergency medical services and air ambulance work; (3) military utility and transport with foreign operators; (4) law enforcement and government duties — the Royal Canadian Mounted Police, the U.S. Department of Homeland Security, and other agencies fly the type; and (5) search and rescue. Twin-engine reliability, Huey-family heritage, and reasonable operating costs explain its broad adoption.

Continuous deployment dates from 1970 for the Bell 212 and 1981 for the Bell 412. Major military operators include the U.S. Marine Corps with the UH-1Y Venom (a deeply revised Bell 412 derivative flown by Force Recon and Marine Aviation Squadrons) and the Canadian Forces with the CH-146 Griffon. Other militaries flying the type include the United Kingdom Royal Air Force (Bell 412 utility), Mexico, Indonesia, South Korea, and Bahrain. The Huey II conversion has rebuilt 250+ UH-1H airframes to twin-engine 212 / 412 standard for international customers. Family-wide output across Bell 212, Bell 412, UH-1Y, and Huey II exceeds 5,000 airframes produced or modified, with production continuing at Bell's plants in Texas and Mirabel, Quebec, Canada.

For Kids — a shorter, friendlier version

The Bell 212 is a twin-engine version of the famous UH-1 Huey helicopter. The original UH-1 Huey from the 1950s had only one engine. The 212, introduced in 1971, added a second engine for better power and safety. Bell also made a 4-blade rotor version called the Bell 412.

The Bell 212 has two Pratt and Whitney Canada PT6T-3 engines together making 1,800 horsepower. It can fly at 130 mph, faster than most cars on a highway, and carry up to 14 passengers or a few thousand pounds of cargo. The 212 looks just like the older UH-1 Huey from outside, but the two engines on top give it more power and a safety backup if one engine quits.

The Bell 412, introduced in 1981, has a 4-blade rotor instead of the 212's classic 2-blade rotor. The 4-blade rotor is quieter and smoother. Civilian operators love the 412 for offshore oil rig flights, search and rescue, and police work.

Bell has built over 1,200 Bell 212/412 helicopters. They have served with militaries (Greece, Canada, Argentina, others), oil companies, news stations, police departments, and emergency rescue teams across the world. The 412 EPI version is still being built in 2026.

Fun Facts

The Bell 212 is the twin-engine version of the classic UH-1 Huey.
Bell 212/412 helicopters have flown for over 50 years in many countries.
The 4-blade Bell 412 is quieter than the older 2-blade 212.
Over 1,200 Bell 212/412 helicopters have been built since 1971.
Bell 412s often fly to and from oil rigs out at sea.
Canada uses the CH-146 Griffon, a military Bell 412 variant.
The Italian-built AB-212 is a license version made by Agusta.

Kids’ Questions

Why two engines?

Two engines give more power, allowing the helicopter to lift heavier loads. Two engines also provide safety: if one quits, the helicopter can still fly home on the other one. Most modern helicopters have two engines for these reasons, while older designs like the original UH-1 Huey had only one.

How is it different from a UH-1 Huey?

The original UH-1 Huey has only one engine. The Bell 212 has two engines on top, side by side. The 212 looks similar from the outside but is a bit longer to fit the extra engine. The 212 also has more powerful engines combined than the single Huey engine, giving it more lift and a backup if one engine fails.

What is the 412?

The Bell 412 is an updated 212. The main change is the rotor: 4 blades instead of 2. Four blades make the helicopter quieter, smoother, and a bit faster. The 412 also has modern electronics. Most civilian users today fly 412s instead of 212s, while militaries use both.

Variants

Bell 212 (Twin Huey, 1970): Original 1970 production variant. Two-blade main rotor (same as UH-1H), PT6T-3 Twin Pac engines. 900+ produced. Civil and international military service.
Bell 412 (1981): 1981 follow-on with four-blade composite main rotor and uprated PT6T-3D engines. Better payload, lower vibration. 1,000+ produced. The principal commercial production variant.
Bell 412EP / Bell 412EPI / Bell 412EPX: Successive Bell 412 sub-variants from the 1980s onward with engine and avionics upgrades. The Bell 412EPX remains in production today. 700+ produced across the sub-variants.
UH-1Y Venom (USMC): U.S. Marine Corps military variant derived from the Bell 412 base. 160 delivered. Flown by Marine Light Attack Helicopter Squadrons (HMLA) in mixed-pair configuration with the AH-1Z Viper. See the dedicated UH-1Y Venom entry.
CH-146 Griffon (Canadian Forces): Canadian Forces Bell 412 derivative. 85 delivered between 1995 and 1998. Flown across Canadian Forces utility, transport, and SAR roles.
Huey II (UH-1H modernisation): Bell upgrade that rebuilds existing UH-1H airframes to twin-engine 212 / 412 standard, offering a cheaper alternative to new-build helicopters. 250+ UH-1H airframes have been converted to Huey II standard for international operators.

Notable Operators

U.S. Marine Corps (UH-1Y Venom): 160 UH-1Y Venom in U.S. Marine Corps service across 7 Marine Light Attack Helicopter Squadrons: HMLA-167, HMLA-169, HMLA-267, HMLA-269, HMLA-367, HMLA-469, and HMLA-773 (Reserve). Flown in mixed-pair configuration with the AH-1Z Viper attack helicopter.
Canadian Forces (CH-146 Griffon): 85 CH-146 Griffon in Canadian Forces service. Used for utility, transport, and search-and-rescue operations across Canada.
Foreign / international operators (30+ nations): The Bell 212 / 412 line is flown by 30+ foreign militaries, including the United Kingdom Royal Air Force (Bell 412 utility), Mexico, Indonesia, South Korea, Bahrain, Japan, Italy, and Spain.
Commercial / civil operators (global): Hundreds of civil operators worldwide. Roles include offshore oil-rig support in the Gulf of Mexico and North Sea, EMS and air ambulance, search and rescue, and other commercial work. The Bell 412 line is one of the most widely deployed Western medium helicopters in civil service.

Frequently Asked Questions

How does Bell 212 differ from UH-1H Huey?

The Bell 212 is the twin-engine evolution. The UH-1H Huey runs a single T53 turboshaft, weighs around 5,000 lb empty, and uses a two-blade main rotor. The Bell 212 pairs two PT6T-3 Twin Pac engines (1,800 shp combined) with updated systems while keeping the same two-blade rotor. Twin-engine layout adds redundancy and improves hot-and-high performance — both critical for civil work and many military and paramilitary missions. The Bell 212 was introduced in 1970, while UH-1H operators have steadily transitioned to Bell 212 / 412 / Huey II standards in the decades since.

How does Bell 412 differ from Bell 212?

The Bell 412 (1981) introduces a four-blade composite main rotor in place of the Bell 212's two-blade rotor, along with updated systems. The four-blade rotor delivers better lift and payload, lower vibration, and improved high-altitude and hot-day performance. The Bell 412 is the current production variant, and most civil operators have transitioned from Bell 212 to Bell 412 and its sub-variants over time. Both trace their airframe heritage back to the UH-1 Huey family.

What is Huey II?

Huey II is a Bell upgrade programme that rebuilds existing UH-1H airframes to twin-engine PT6T-3 standard, effectively bringing older single-engine Hueys up to Bell 212 / 412 performance. It offers a cheaper alternative to buying new helicopters, and many international operators have used Huey II to extend the service life of their UH-1H fleets while gaining a second engine. 250+ UH-1H airframes have been converted to Huey II standard. Customers include several Latin American and Asian nations.

What is the Bell 412 commercial market?

It is large. Hundreds of civil operators worldwide use the Bell 412 for: (1) offshore oil-rig support in the Gulf of Mexico, the North Sea, and elsewhere; (2) EMS and air ambulance; (3) search and rescue; (4) law enforcement; and (5) other commercial work. The Bell 412 competes with the AgustaWestland AW139, the Sikorsky S-76, and the Eurocopter / Airbus AS365 / EC155 family. Proven Huey heritage, reasonable operating costs, and an extensive support network keep it popular with operators where reliability is paramount.

What is UH-1Y Venom's relationship to Bell 412?

The UH-1Y Venom is the heavily revised U.S. Marine Corps variant of the Bell 412 line. USMC-specific changes include a glass cockpit, expanded electronic-warfare protection, integrated weapons (.50 cal door guns, 70mm Hydra 70 rocket pods), and updated mission systems tailored to the assault role. The UH-1Y flies in 'mixed pair' formation with the AH-1Z Viper attack helicopter, and the two share around 85% common components — a configuration unique to U.S. Marine Corps operations.

How many Bell 212 / 412 have been produced?

Family-wide output exceeds 5,000 airframes across Bell 212, Bell 412, UH-1Y, and Huey II conversions. The breakdown: 900+ Bell 212 (1970–1990s), 1,700+ Bell 412 (1981–present), 160 UH-1Y Venom (U.S. Marine Corps), 85 CH-146 Griffon (Canadian Forces), and 250+ Huey II rebuilds, plus export variants. That figure is roughly one-third of total UH-1 Huey family production — around 16,000 across all UH-1 / Bell 204 / Bell 205 / Bell 212 / Bell 412 / UH-1Y variants since 1959 — making the Huey family one of the most-produced helicopter lineages in history.

Sources

Bell Textron — Bell 412 commercial
Wikipedia — Bell 212 — Source extract used for grounding; CC BY-SA attribution.