Ron van Maanen says that there were fireships in 1665 fitted with "bangmakers"

Ron van Maanen lists a fireship Walvis that served in 1665 for the Admiralty of Zeeland. The ship had dimensions 91ft x 21-1/2ft x 11ft. The Walvis carried two guns and had a crew of 12 men. Interestingly, Ron says that the Walvis was fitted with "bangmakers". That is the only reference to "bangmakers" that I could find in his largest document. I need to look at Frank Fox's book, A Distant Storm, to see if he mentions "bangmakers".