The slave ship Viper left the African coast carrying enslaved Africans toward Grenada. About 530 people had been taken aboard.

Vessel: Viper; flag: Great Britain; rig: Ship; estimated standardized tonnage: 258. People recorded in connection with the voyage: Captain: Matthews, Joseph; Investor: Matthews, Joseph; Investor: Case, George; Investor: Gregson, John; Investor: Gregson, James; Captain: Apsinall, James; Investor: Apsinall, James; Investor: Gregson William (Jr); Investor: Wilson, Edward; Investor: Falkmer, Edward. The voyage began at Liverpool on 5 April 1787. Principal recorded place where captives were acquired: Cape Coast Castle (Gold Coast). Principal recorded disembarkation place: Grenada, place unspecified. Recorded outcome: Voyage completed as intended.