Blue Shorts said:
A 5 foot drop to flat is a lot of force... especially with a 200 pound rider on it. If you regularly do 5 foot drops to flat, the bike will break eventually... probably as you're JRA
The best you can hope to land on a drop to flat is with both wheels touching at the same time, or the back touching slightly before the front.
Check with Intense. I will be extremely surprised if they tell you that it's OK to do that to a 5.5.
As repeated in this thread, it all depends on how you land. My 819 rims are still straight, even after riding the bike on the same stuff where I ride DH bikes - it's all about being smooth, which also comes from many years of racing BMX bikes (after my early years of jumping off school roofs).
No, you don't want to land both wheels at the same time when landing to flat - rear first. Also as mentioned, in some situations, speed helps (it reduces the effective downward drop).
I don't care what Intense says. I got my 5.5 when they first came out in 2003, and I've never had a problem. And I won't go whining to them if I break it at this point - that frame has served me well. I'll break the bars first, though, which is why I do replace bars more frequently as a preventative measure.
Also as mentioned, I don't understand why someone would making dropping 6' to flat as their goal. Going to flat isn't really fun. Even thought I'll do it, I think it's kind of a lame goal, in my opinion. Try something else, like riding one-handed or even one-handed wheelies (which I've become even better at after spending the last 4 months with my left arm in a cast). No, none of my friends have never accused me of being sane.