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US Supersonic Transport (SST) Program 1960-1971

blackkite

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uk 75

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This chart of Concorde liveries came from a children's book in the 1960s. Except for MEA and Sabena the liveries would have been used for Boeing and Lockheed SSTs. Sadly no such chart exists for them.
 

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Archibald

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I often wonder if an analog FBW similar to Concorde could have "tamed" SCAT-15F vicious low speed and stall characteristics... or would it take a digital Apollo guidance computer ?
 

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blackkite

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ibteravia-aout-1966-9.jpg
A - Bunker vehicles. B - Telescopic boarding gangways. C - Generating sets. D - Truck for the drinking water service or for the evacuation of waste water. E - Food and drink supply trucks. F - Luggage trolleys. G - Floor air conditioning installation. H - Reactor start-up group. I - Conveyor belt for luggage.
On board a supersonic airplane, two kinds of air intake systems are generally used; in one of the systems the compression occurs on the outside, in the other inside the inlet channel with external compression, the normal shock wave which produces the compression of the air and, therefore, its slowing down at subsonic speed is perpendicular to the wall of the intake duct and originates just at the entrance to the sleeve; in the mixed compression inlet system, the normal shock wave forms only far enough downstream, so inside the sleeve itself. In the first case, the air enters
the sleeve when it is already at subsonic speed and a subsonic diffuser is enough to bring it to the optimum speed. In the second case, two consecutive diffusers must be provided; a convergent diffuser for the subsonic flow, another divergent for the subsonic flow from the first.
 

blackkite

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Another factor plays an important role in the design of a supersonic aircraft air inlet. If the inlet system is calculated to obtain the optimum recovery of the dynamic pressure (as is the case, for example, in the air inlet with external compression) and the air enters the diffuser with a subsonic speed, the instability of the flow can cause impulses thereof: the air masses admitted into the diffuser are alternately accelerated and slowed down at a frequency of 3 to 5 Hz; the phenomenon referred to as “inlet unstart” greatly reduces the efficiency of the diffuser and causes intense structural and dynamic effects on the cell and on the reactor, which can lead to pumping of the compressor.
In order to combat this tendency to pulsation, the Lockheed L-2000-7 is provided with a variable section entry sleeve whose central corner moves continuously during normal flight in order to follow variations in internal aerodynamic conditions; these are modified, for example, by the operation of the post-combustion or by variations in the speed of the aircraft. In this way, the optimum supersonic compression and the normal shock wave are maintained at all times within the limits determined in advance. External disturbances caused by atmospheric conditions, aircraft maneuvering or shock waves from other supersonic airplanes must also be taken into account. As a result, care must be taken to ensure that the air intake system is perfect as well as that of the main flight controls, which implies attaching equal importance to its maintenance and reliability in operation.

The air intake system chosen by Lockheed is a mixed compression system with automatic start; the drawings below show the internal configuration during take-off and in supersonic cruising flight. The entry corner is rectangular in cut but its shape can be modified to adapt the entry section to operational conditions. In addition, various air inlets arranged along the outer walls make it possible to maintain the air intake at a sufficient level and to stabilize the flow in the event of disturbances. The wedge adjustment mechanism is operated by two independent hydraulic circuits. In the sleeve are placed sensors which measure the pressure in the channel and allow to determine the position of the compression waves; their signals control the opening and closing of the secondary flow valves and auxiliary air intakes.

The main material used for the manufacture of the air intake system is titanium; the wedge adjustment mechanism is also made of machine-worked titanium parts. In the construction and finishing of the inner walls of the channel, care must be taken that the surfaces do not present any undulations or irregularities which could give rise to turbulence. Regarding maintenance, it is important to protect the leading edges of the handles, which are relatively thin, from damage.
 

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hesham

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From, Faster Than Sound The Story of Supersonic Flight,

please notice Convair design.
 

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blackkite

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blackkite

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blackkite

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Source : Aireview magazine and JAL.
 

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