Vinni3,
A "delta wing" is triangular.
Look at the F-102, or the French Mirages, or the Avro Vulcan, or the Valkyrie.
Those are delta wings.
The wing of the SR-71 is much closer to the "ogee" wing of Concorde.
Edit: sorry, you're not really wrong... the wing as such is pretty well triangular.
The major difference lies in the 'chines', the flat horizontal extensions of the forward fuselage, and outboard of the engine nacelles.
Their effect is the same as that of a "double delta", and similar to that of the "ogee" wing shape of Concorde.
coobg002,
I'll try to give you a reasoned answer... but later. Dinner's been called!
CJ
Last edited by ChristiaanJ; 8th Nov 2010 at 20:21.