Modern examples include the Sukhoi Su-33, while pioneer examples include the Voisin-Farman I. Outboard tail: split in two, with each half mounted on a short boom just behind and outboard of a wing tip. It comprises outboard horizontal stabilisers (OHS) and may or may not include additional boom-mounted vertical stabilisers (fins). In this position, the tail surfaces interact constructively with the wingtip vortices to significantly reduce drag.