Jsem si říkal proč Falcon Heavy, když ta plachetnice bude vážit minimum... a on to není jediný náklad, LightSail je jenom taková bokovka.
Hlavní náplň této mise pojmenované ­"STP­-2 MISSION­" je úplně něco jiného.

edit: už jsem to našel, podle specifikace jenom 5 Kg :­)

The Department of Defense ­(DoD­) Space Test Program­-2 ­(STP­-2­) mission, managed by the U.S. Air Force Space and Missile Systems Center ­(SMC­), is targeting launch on June 24, 2019, with the launch window opening at 11:30 p.m. ET. Lifting off from Launch Complex 39A at the Kennedy Space Center in Florida, this mission will deliver 24 satellites to space on the DoD­'s first ever SpaceX Falcon Heavy launch vehicle. The STP­-2 mission will be among the most challenging launches

in SpaceX history with four separate upper­-stage engine burns, three separate deployment orbits, a finalpropulsive passivation maneuver and a total mission duration of over six hours. In addition, the U.S. Air Force plans to reuse side boosters from the Arabsat­-6A Falcon Heavy launch, recovered after a return to launch site landing, making it the first reused Falcon Heavy ever flown for the U.S. Air Force.