AirTran 717 HIGH POWER Static Takeoff #2 @ ATL Seat 27A on 8/3/14 HQ
High Power "Static" Takeoff #2 Before the flight, I asked the captain if he would perform a high power "static" takeoff (holding the breaks, throttling up, then ...
+gil zur Believe it or not, you hear a lot more thrust in the707, because those engines do have internal combustion. I'll never forget that takeoff, either. It was the first time I'd ever experienced anything like it, and I got a huge thrill out of it. I can imagine it being even more of a thrill aboard the 717, because the plane is much smaller, and you feel more in the back. I would have loved to be aboard that plane during the takeoff.
+Josh Gamble The screaming is the Blade Pass Frequency. The buzzing comes from propagating shockwaves in the intake due to the supersonic tips. That of which is only per full revolution of the fan.
newer turbofans like the dreamliner engines dont have a buzzsaw noise like the older turbofans did due to their new advanced design and various other things. jet engines typically scream when under power cause all the parts are turning, the tips of the fan blades typically go supersonic thats what the buzzsaw noise you hear is. turbo's that go on internal combustion engines scream as they spool up also, as a turbo is essentially a jet engine without a combustion chamber. Hope this helps
+Josh Gamble The fan blades typically exceed Mach 1 upon application of takeoff thrust. One of the results of this is the 'buzzing' or 'groaning' sound heard on takeoff.