The saucer does not have warp drive. Period. It can maintain a warp field if the ship separates at warp, but the saucer cannot generate its own warp field. Want proof? Look at the Master Systems Display along the back wall of engineering. No warp core, no imbeded nacelles, warp field coils, or any indication of a warp drive system I doesn't have it. Wasn't intended to have it and all production materials, tech. Manuals, ship plans, cut-away posters, blue prints offically released by Paramount and made by those involved with the creation of the show and coming up with the fictional technology supports this. Any time the saucer is at warp it was but there by the Stardrive Section, never of its own ability.Why a years old thread was resurrected to discuss this beyond me.