I've put together a spreadsheet of all the classes I could find that served between 1936 and 1948. The information on Bulgaria was patchy (and not always consistent between sources), and I'm gathering more detailed data on each ship and when I get to Bulgaria (probably sometime next year at this rate), I'll refine it, but what I've got so far is:
- Five auxiliary patrol vessels (likely civilian yachts or trawlers with relatively small guns plonked on them during wartime)
- Four S2 type MTBs, built in Germany, which began service with Bulgaria in 1939, 47.8 tons with a 20mm cannon and 2 21-inch torpedoes. Bulgaria originally planned to build more of this class domestically, but it didn't eventuate.
- Two Belmorec class Motor launches, built in the USA and commissioned in 1918, 77 tons with a three-inch gun.
- Four ex-US SC class submarine chasers, built in the USA during WW1, 77 tons with a three-inch gun.
- Six Drski class torpedo boats, built in France before WW1, 97.5 tons with two 20mm cannon and two 17.7 inch torpedoes.
In the context of HoI, none of those vessels comes close to getting into the game. If I've missed any you're aware of, I'd be very interested to know
.
Edit: For a good web source, try
http://www.navypedia.org/ships/bulgaria/bu_index.htm - so far my data are only based on the Conways All the World's Fighting Ships books and I haven't gone through Navypedia, but Navypedia covers the smaller vessels more thoroughly (mostly), so you might find more here.