Jet Engines Get a Timely Innovation

Fuel savings rank highest for me, but there are substantial CO2 emission and noise reductions. Good news all around for environmentalists, passengers, and airlines.

From Wired.com:

Pratt & Whitney has spent the better part of two decades developing the geared turbofan engine that burns 12 to 15 percent less fuel than other jet engines and cuts carbon dioxide emissions by 1,500 tons per plane per year. It's being called one of the most exciting developments commercial aviation has seen in years...

Current jet engines have fans that suck air into the combustion chamber, where it is compressed, mixed with fuel, and ignited. Then it's blown through a turbine, generating thrust. It works, but it's inefficient because the fan is connected to the engine and turns at the same speed as the turbine. Fans work best at low speed, while turbines work best at high speed.

Pratt & Whitney solved that problem with a gearbox that lets the fan and turbine spin independently. The fan is larger and it spins at one-third the speed of the turbine, creating a quieter, more powerful engine the company says requires less fuel, emits less C02 and costs 30 percent less to maintain. Pratt & Whitney has been torture-testing the engines, and its engineers have simulated more than 40,000 takeoffs and landings.

Congrats to the Pratt & Whitney team. May they have immense profits.