Lost Coast Rocket by Joel Horn

Rockets are in Ken’s DNA. At an early age, he develops a friendship with Akira, a boy who shares his passion for astronautics. While both are child prodigies, Akira does well in private school but Ken rebels against structured education. The unlikely duo draws together a small group of rocketeers.
A tragic event at eight years of age haunts Ken through his growing-up years and shapes his destiny. As fate would have it, the girl at the center of the traumatic experience joins Ken’s rocket club, unaware of their shared history.
As the group reaches their teen years, their rocket designs start pushing legal boundaries, culminating in an event that puts them in the crosshairs of an FBI investigator. To protect his friends and seek refuge from his past, Ken devises an escape plan that confounds the authorities and the world.