The Dutch warships in reserve prior to 1652

We believe that the 36 ships funded by an act of the States General in 1651 were all purpose-built warships. At least a few were new construction, such as the Admiralty of Amsterdam ships Vrede, Vrijheid, Jaasveld, and Overijssel (presumably). The others that we know of, in service with the Admiralty of the Noorderkwartier, were warship that were apparently "in reserve", and could be reactivated. The 36 ships may well have consumed the entire inventory of ships in reserve, as there seem to have been none available to add in 1652. Those were all merchant ships hired by the Directors and the admiralties. The ships in service in early 1652, prior to the hiring of the 50 Directors' ships and the 100 ships to be hired by the admiralties consisted of the following:

41 ships (not 40) ships in service since the peace treaty in 1648
36 "cruisers" funded in 1651
10 ships for a relief squadron sent to Brazil, 
     which had returned by June 1652.

We also know that while all, or almost all of the 50 Directors' ships were immediately hired, only about 38 ships were hired by the admiralties, out of the 100 ships funded. The reason is at least in part that there was a shortage of suitable ships in home waters.