6 daN = about 13 lb force, reasonably significant and if you scale up to Vd with Q, you get a theoretical force of aver 45 lb (not that I was going to try that, the thing has to be pointed straight at the ground to reach Vd, which is bad for the soul and certainly not the time to be mucking about with doors).
Big difference between what I was flying and a Cessna, which is that I had hinges at the top and the Cessna has hinges at the front so even if the Cessna door comes open, it isn't going to go far.
G