
First there were hybrid cars that have recently become very popular, technology and efficiency continues to improve, but could this technology every apply to aviation? It has been an idea that has popped into my head recently. In times when the FAA and EPA are looking for alternatives to 100LL AvGas to remove lead from fuels once and for all, to the constant worry by environmentalists of airplanes effects on global warming and our atmosphere, the need for more fuel efficient airplanes has been growing.
From Boeing (with funding from NASA), on the heels of the 'Solar Impulse' solar powered flight lasting 24 hours, increased fuel economy of the upcoming Boeing 787, comes the Boeing SUGAR Volt. (The SUGAR stands for 'Subsonic, Ultra Green Airplane Research'.) The Boeing's subsonic team, consisting of Boeing, General Electric and Georgia Tech personnel, have created the SUGAR Volt concept. According to Boeing, the team "found that one concept known as SUGAR Volt - which includes an electric battery gas turbine hybrid propulsion system - can reduce fuel burn by more than 70 percent and total energy use by 55 percent. This fuel burn reduction and the "greening" of the electrical power grid can greatly reduce emissions of life cycle carbon dioxide and nitrous oxide. Hybrid electric propulsion also has the potential to shorten takeoff distance and reduce noise."
In addition to the efficiency of the design, the noise reductions quoted by the designers come in around 70% as well, no doubt providing welcome relief for neighbors of large, busy airports.
To those wondering how it would work, just think basically of the Prius, the conventional jet-engines would power and charge the bank of batteries that supply an electric powered propulsion system. To help reduce fuel-consumption, the engine would consist of one of the highest bypass ratios (BPR) to date. See here for a scientific explanation of the bypass ratio. The higher the BPR, the more fuel-efficient the engine. Current jet engines fall around 5:1 - 7:1, with the newest, most fuel efficient engines coming in around 10:1 and 11:1 on the Airbus A380 and Boeing 787 respectively. The goal for the SUGAR Volt will be in excess of 20:1.
Imagine, air travel to be quieter, more efficient, and much more environmentally friendly. Remember, fuel costs based off the dramatic rise in oil in 2009 led to extremely large losses for the airlines. This resulted in fuel surcharges and other fees. With fuel efficiency increasing by 70% if this technology comes to fruition, the cost savings to the airlines would be immense, not to mention additional decreases in the world's reliance on oil.
Don't expect to see these anytime soon however, Boeing is aiming for having planes like the SUGAR Volt available for commercial use around 2035, so 25 years down the road; however, there is finally some spectacular innovation occurring that will change the face of aviation once again.