It's been a while since I investigated this for my use. I have the 4th edition of Victor Shane's "DDDB - Drag Device Data Base: Using Parachutes, Sea Anchors and Drogues to Cope with Heavy Weather" which I got from Captain's Nautical. There might be a newer version, but I see that http://www.dddb.com/
appears dead so maybe not. The three copies on AbeBooks Official Site - New & Used Books, New & Used Textbooks, Rare & Out of Print Books
are all 3rd editions.
I'm not concerned about a sea anchor for offshore use, but I wanted to have something to deploy in an emergency to substantially slow my windblown progress in a channel or strait (the most common bodies of water in the PNW, often with a dangerous "Rapids" at one end!). As you might imagine, a traditional anchor would be virtually useless in many of these bodies of water .
I carry a 28' round nylon parachute on a swivel. I don't have a trip line - I'm willing to accept the trade-offs and just buy another one if I ever have to deploy it (carried it for 10 years, haven't used it yet).