On Fri, 15 Mar 2002 12:50:08 -0800 Andy Ross <[EMAIL PROTECTED]> wrote:
>And even so, it's not the *position* of the gear tip that is the >problem, it is the *direction* of the compression vector. An 20 >degree difference from vertical (not a terribly uncommon AoA for a jet >touchdown, or bank angle for a stiff crosswind landing) can results in >a translation of sin(20) (about 34%) of the gear length. The >difference in spring force between a gear compressed by 34% and one >that isn't compressed is very large. Try using a cosine if you are talking about spring compression. An aircraft with a straight strut extending straight down from the wing, with the aircraft at twenty degrees alpha would compress the strut about 4.25 inches instead of 4 inches (when using pure Z compression). We're talking about just a few percent even at twenty degrees. The backward _movement_ of the contact point for a gear that compresses 3 and the aircraft at a twenty degree pitch would be one inch - a small inaccuracy. Where are you getting your figures? Jon Jon _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
