As you might be able to tell, I am currently consumed by learning about the Battle of Portland (the Three Days Battle). I thought it might be interesting to list my best estimates for the four Dutch flagships at the Battle of Portland. Sadly, this has some estimates and calculations, although it also includes the best information available from archival sources (Nationaal Archief in the Hague).
Note that the dimensions for the Brederode are calculated. Researchers such as Jan Glete and Ab Hoving have known for a long time that the usual dimensions for the Brederode are actually in Maas feet, not Amsterdam feet. Roughly, you can multiply a Maas foot by 12/11 to get the dimensions in Amsterdam feet. I only found this out about a year ago, when I got the "famous" 26 February 1652 Rotterdam Admiralty list.
| Name | Brederode | Witte Lam | Hollandia | Monnikendam |
| Captain/Admiral | Tromp | De Ruyter | Jan Evertsen | Pieter Florissen |
| Admiralty | Rotterdam | Vlissingen Directors | Zeeland | Noorderkwartier |
| Guns | 58 | 40 | 38 | 36 |
| Crew | 270 | 140 | 160 | 138 |
| English Burden | 654 tons | 395 tons | 379 tons | 368 tons |
| Navigational draft | 17ft | 13ft | 14ft | 13ft |
| Length x Beam x Depth | 144ft x 35ft x 14ft-8in | 127ft x 27-1/4ft x 12.5ft | 120ft x 29ft x 12.5ft | 120ft x 28.5ft x 11ft |
| Gun list | 4-36pdr, 12-24pdr, 8-18pdr, 20-12pdr, 10-6pdr, 4-4pdr | 2-24pdr, 4-18pdr, 14-12pdr, 10-8pdr, 6-6pdr, 4-4pdr | 4-4pdr, 16-12pdr, 12-8pdr, 6-4pdr | 4-18pdr, 10-12pdr, 8-8pdr, 10-6pdr, 4-4pdr |
