NASA's Next Solar Sail Is About to Go to Space

Tom Swift Jr and the Cosmic Astronauts: http://www.tomswift.info/homepage/cosmic.html

> A critical part of a solar sail spacecraft is its booms. Booms support the sail material; the lighter and stronger they are, the more effective the spacecraft will be. Though solar sails are much lighter than other spacecraft, the weight of the booms is still a hindrance.

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> “Booms have tended to be either heavy and metallic or made of lightweight composite with a bulky design – neither of which work well for today’s small spacecraft.” / Keats Wilkie, ACS3 principal investigator, NASA

I'd expect that the lack of weight and also the limited force the solar wind applies to the sail would result in minimal structural strength requirements for the boom. Am I missing something?