I am a well-known fan of Crow, having used theme for over twenty years now. Matt (the owner/president) has a big binder where he keeps the design data fr every experimntal aircrfat that he has done - all the RV’s are in there, as well as many others. We have 5-points in the RV-3, -8, the new Rocket, and Loki (the little jet). I had resisted putting the five-points in the RV-6 becasue I didn;t want to go to the worj of fabricating a crotch-strap anchor, but Matt now makes a “6-point” where the crotch strap attachment goes to the seat belt anchors. This “Y” goes fromt eh crotch strap and under the cushions (under your thighs basicaly) and keeps you from submarining. He told me this is a very common design in race cars (their primary business). Great little company, eager to work with customers on customization.