I found I could not calculate ship speed without this data, I also have the jewel case DVD so I am missing any hardcopy of the manual.
I am using
SH4 1.5 with TMO 1.52 and SCAF 1.5 for that version, a forum search showed no ship length data for this combination - but some1 posted a version where they tagged on the length to the ship names - so I did the same for this setup.
I made it for personal use but I figure some1 might find it handy so here it is
- USE AT OWN RISK! -
Copy the names.cfg file to Data/Roster directory making a BACKUP of the existing names.cfg
http://rapidshare.com/files/171706761/names.cfg.html
http://www.filefactory.com/file/76618d/n/names_cfg
http://www.megaupload.com/?d=S4SNYAIM
Like I say it was for personal use so if theres any inaccuracies etc just change them yourself

Oh the cfg stuff was in meters so I changed it to feet but rounded off the decimal points I haven't really tested it yet but I hit the cruiser and the junks ok so I guess some of the numbers are ok. Open office was used to suck apart the original file - I can't guarantee it put it back together again ok.
EDIT: changed download to (L: xx ft) to match the rfb names cfg a few posts below and to better squeeze in next to long ship names.