Mach Crit B747

[YHZ Pilot]

Hi Everyone,

Does anyone know where a shock wave first appears on the 747?

[shimmydamper]

I believe on the hump

[hawk37]

It may well be on the fuselage as shimmy states, but if your asking about the wing, normally appears first at the thickest point of the wing.

[YHZ Pilot]

The first place the shock wave appears on the entire a/c. Doesn't necessarly have to be on the wing.

[777fly]

As any 744 pilot knows, M crit is achieved, at normal cruise speed, at a point on the upper fuselage approx 2 metres aft of the Captain's seat. This is exactly above the flight crew rest area and is recognised as a constant tearing noise. Only the truely jet-lagged can sleep soundly at this position.

[YHZ Pilot]

Thanks for the replies!