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LOOP News 7 MAR 08: TACKLING EMISSION HEAD ONIT’S not often that jets get news attention for positive ecological impact, but the there was some last month. The in-development Cessna Citation Columbus due for 2014 will get power from the newest range of Pratt & Whitney turbofans, which are undercutting current international emissions targets by up to 50% and show the industry progressing in leaps and bounds to minimise its environmental footprint. The PW800 series of turbofans were chosen by Cessna because, among other things, they are 50% down on emissions levels for NOx and 35% down for CO2, both expected to become increasingly important measures for acceptability in air travel. The 8830lb PW810 the Columbus will use is also far quieter than forthcoming standards too, all of which helps jet operators hold their head high at dinner parties. The secret to the PW800 range’s impressive numbers is the firm’s patented Talon combustion technology which was designed from inception be low emission, low noise, and more efficient than predecessors. Sound levels are projected to be 50% down on 1997 levels. Talon is an acronym for Technology for Advanced Low NOx, and focuses development on the combustor chamber liners and quench zone beyond, moderating cooling air within the turbofan more accurately than before to minimize unnecessary power-sapping cooling and directing it where it is most needed. Taking unneeded air out of the cooling system means more gets into the combustion process so is more efficient, while a faster quench stage means the burnt gases are at high temperatures for shorter so cutting NOx emissions. NOx is a key component in the incidence of acid rain and smog. Meanwhile the Columbus 850 program gathers pace. The $27m intercontinental-range jet will be Cessna’s biggest yet and takes rivals from Bombardier and Dassault head on. The 12-seater is projected to have 0.85 maximum cruising speed and a 4000 mile range. It will be the 10th model in the Cessna jet range. |                    | ||||||
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