| toms shoes classics 10/25(日) 01:02:17 No.20151025010217|
It is also interesting to note how times change, particularly in areas like environmental performance. Although Boeing designers were obviously aware of the noise issues that came with the low bypass ratio jet engines of the day, the surprising yardstick for improvement as mentioned in the article were piston powered airliners of the day, as well as the raucous 707 and 720Bs. the community noise level problem Boeing holds out real hope, says Anderton. nautical mile from the end of the runway, the 727 is expected to be making about 109 db., compared with about 110 for a Douglas DC 7C, 112 for a Douglas DC 6B, or 125 for the Boeing 707 120 using water power injection power.