nighthawk2174 Posted September 10, 2019 Posted September 10, 2019 Something I've noticed is that the airbrake will deploy above M1.2, then retract when below that speed and will be unable to be opened again till below M.8. Is this correct behavior?
Buschwick Posted September 10, 2019 Posted September 10, 2019 Might having something to do with the transonic region as it's stressful with parts of the plane being supersonic while others are not. Some parts of the plane can actually be at Mach 1.2 while the plane itself is just hitting Mach 1. And on the low side of the region the plane can be at Mach .8 while air over the wings is Mach 1. [sIGPIC][/sIGPIC]
pacastro Posted September 10, 2019 Posted September 10, 2019 (edited) I think it may have to do with the airbrake limit speed being in knots (airspeed) and not Mach number.. so the Mach number limit depends on your altitude, if you are high enough you can be at M1.2 and also below the speed brake airspeed limit (between 400 to 500 knots IIRC), and if you then descend you can reach an altitude where M0.8 has an airspeed above safe speed brake deployment and you won't be able to open them. Edited September 10, 2019 by pacastro
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