CBU-55
Design
Design
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The device had compartment with propane, and another compartment with [explosive](/wiki/Explosive "Explosive"), designed to spread and ignite fuel.

The CBU\-55 had two variations. The CBU\-55/B consisted of 3 BLU\-73A/B [fuel\-air explosive](/wiki/Fuel-air_explosive "Fuel-air explosive") sub\-munitions in a SUU\-49/B Tactical Munitions Dispenser, and the CBU\-55A/B had 3 BLU\-73A/B sub\-munitions in a SUU\-49A/B dispenser). The SUU\-49/B dispenser could be carried only by helicopters or low\-speed aircraft, whereas the SUU\-49A/B was redesigned with a strongback and folding tailfins, so that they could also be delivered by high\-speed aircraft as well.


What is the function of the strongback in the SUU-49A/B dispenser?