B-3 is a Czech-origin fixed-wing military/ISR drone listed in the CNAS Drone Database, but the public record available in the supplied data is very limited. It is most relevant to defense researchers, institutional evaluators, and readers comparing fixed-wing surveillance-class UAVs rather than everyday drone buyers. What makes it notable is not a rich public spec sheet, but the fact that it appears as a named platform in a recognized drone reference source while many details remain unconfirmed.