John!
I think that we should expand the subject to complete era of sailing navy of Oman/Muscat/Zanzibar, ie ca 1650-1872,
as there aare really no any comprehensive works on the subject. Omany Navy was from the begining very important
naval power in Indian Ocean. In 1880s there were still 2 armed dhaws served as a navy.
Omani Navy was negleced at the begining of XVIII century and in 1756 owned only
two ships and couple of gallivats
By the 1770s compised 4 ships of 40 guns , 25 locally built ketches and gallivats of eight to fourteen guns each and
a larhge nunspecivied number of dhows and trankies
In 1786 it was reported that the Imam owned 3 large ships
- Rahmani (She was a frigate already extant 1775)
- Ka'ba-Ras
- Nasiri
one small ship
8 man-of -war
8 dhows
In 1804 merchant fleet (probably warships also included) was composed of 15 ships of 400-700t , 3 brigs and 50 large dingies