Editing Project HARP (section)

==== High Altitude Research Facility ====
The 16-inch HARP gun in Barbados held the largest gun record globally, with a barrel length of 119&nbsp;ft (36{{frac|1|4}}&nbsp;m) and weighing 200 tons. It consisted of two 16-inch U.S. Navy gun barrels welded together and smooth-bored to 16.4-inch diameter. It was capable of firing at a muzzle velocity of 2,164&nbsp;m/s (7,100&nbsp;ft/s) with a maximum acceleration at launch of 15,000 g. It launched a 181-kg shot with an 84-kg payload that could reach an altitude of 181&nbsp;km (595,000&nbsp;ft).<ref name=":8" /> For propellants, the 16-inch gun used either the solvent type WM/M.225 or the solventless M8M.225, both manufactured by Canadian Arsenals Limited. During testing, a camera station set up on the islands of [[Barbados]], [[Saint Vincent and the Grenadines|Saint Vincent]], and [[Grenada]] were used to photograph the [[trimethylaluminium]] trails released from the projectile during launch, which provided data on upper atmosphere wind velocities for different altitudes.<ref>{{cite report|url=https://escholarship.mcgill.ca/concern/reports/2514nk70j?locale=en|title=Report of the March 1965 test firing series Project HARP|last=Luckert|first=H.J.|date=July 1965|publisher=McGill University|id=SRI-H-R-9}}</ref>