Bundle comprising two pairs of tanks, and an airborne launcher including such a bundle

1. An airborne launcher, including a bundle of tanks, the bundle having an axis and comprising two pairs of same-volume cylindrical tanks, each pair comprising two tanks containing a same-density propellant suitable for flowing at the same volume flow rate, said four tanks being fastened directly to one another via reinforcing hoops in such a manner that the center of gravity of each of said pairs remains continuously on the axis of said bundle while said propellants are flowing; and

wherein the bundle includes fastener means secured to two of said tanks enabling a wing of said launcher to be fastened directly thereto.

2. An airborne launcher according to claim 1 , wherein said reinforcing hoops form integral portions of said tanks.

3. An airborne launcher according to claim 1 , wherein at least some of said reinforcing hoops include fastener means for an engine and for a payload.

4. An airborne launcher according to claim 1 , wherein a section of a top stage of the airborne launcher in which said bundle is to be found is of a cross-section that is square with corners that are rounded.

5. An airborne launcher according to claim 1 , wherein:

the two pairs of tanks are arranged as four tanks disposed in a two-by-two array; and

the two tanks of each pair containing the same-density propellant are arranged in diagonal opposition within the two-by-two array.

6. An airborne launcher according to claim 1 , wherein:

the two pairs of tanks are arranged as four tanks disposed in a two-by-two array, at least one reinforcing hoop disposed circumferentially around each tank; and

fittings are attached between adjacent reinforcing hoops of adjacent tanks.