Is Vandread: Gekitou-hen hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2002 · 1 episodes · PG-13 - Teens 13 or older
Adventure, Comedy, Ecchi, Mecha, Sci-Fi, Space
Vandread Gekitouhen (Vandread Turbulence), similiar to Vandread Taidouhen, is an OVA summary of Vandread the Second Stage plus several extra scenes (Source: AniDB)
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