"Senator" conducted trials in June 1918 to test the feasibility of a flying off platform aft, with the intent of launching an aircraft with the ship proceeding full speed astern; however, the amount of spray rendered this proposal unworkable.Later (c. 1927–28) both "Stronghold" and "Thanet" were fitted with a cordite catapult for launching aircraft from their fo'c's'le (the forward gun was removed); they were used to test the Larynx, an early experimental type of cruise missile.