Here's a main link that you can go to that has several links to other blueprint sites. You can find everything from cars, boats, planes, military stuff etc..
I'll post more links as I find em.
http://ofp.gamezone.cz/_hosted/brsseb/links.htm
another great site with all kinds of reference. I think the same link can be found from the other site, but still it's a great one. You can find anatomy reference of every kind.
http://www.planetquake.com/polycount...ef_links.shtml