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Originally posted by TDawgRex
reply to post by granpabobby
There is a sticker on HUMMV's engines basically stating that this engine is exempt from emissions control. They are also on everything the US Army rolls. I'm sure that the USAF and USN have similiar relaxed standards.
- from here
Standards limiting the emissions of smoke, unburned hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx) from turbojet and turbofan aircraft engines are contained in Annex 16 Volume II (Second Edition, July 1993, plus amendments) [Reference 2] to the Convention on International Civil Aviation. The Annex also contains approved test and measurement procedures.
Originally posted by ahnggk
The fact that the B-52 while their old engines smoke a lot, they are more aerodynamically efficient than most modern jet airliners today using cleaner engines that's why the B-52 can cover the same distance, and probably burn the same amount of fuel.