livendive 8 #1 August 13, 2004 Could someone who's built their own linesets in the past please translate this document into plain English? I can't tell if the trim specs are above baseline (A-line length) or above the preceeding value, e.g. the difference between A-B, B-C, and C-D. The brake line lengths are specified as X inches longer than the D's, but I don't get the brake setting specs. Why would we measure them above A rather than above the knot? Blues, Dave"I AM A PROFESSIONAL EXTREME ATHLETE!" (drink Mountain Dew) Quote Share this post Link to post Share on other sites
FrogNog 1 #2 August 13, 2004 Having never ever seen a line trim spec, and not looking at the one you posted, I can say that I hope they are not measuring line trims "relative to the previous line group", because that would cause additive error, which is bad. -=-=-=-=- Pull. Quote Share this post Link to post Share on other sites
darkwing 5 #3 August 14, 2004 it seems unambiguous to me, for example on the Diablo 88 the C lines are 145 mm longer than the B lines. -- Jeff My Skydiving History Quote Share this post Link to post Share on other sites
riggerrob 643 #4 August 14, 2004 Hee! Hee! Hee! Welcome to the weird and wonderful world of measuring canopies. Every manufacturer uses their own method to measure lines. By the same token, only a handful of canopy manufacturers use the PIA method to measure canopy span and chord. The rest of them use a bewildering array of methods that they cannot/refuse to explain to mere mortal field riggers. Some manufacturers measure from a (baseline) A line (i.e. Performance Designs) while others measure cumulatively (i.e. Para-Flite). Figuring out which method a particular manufacturer uses requires staring at the chart for a long time, plus a few errors and some magic dust! Hee! Hee! Hee! I am contemplating giving a lecture on how to re-line a canopy at the 2005 PIA Symposium, during which I will touch on these anomalies. Quote Share this post Link to post Share on other sites
nitrochute 2 #5 August 15, 2004 line trims are measured above the preceeding value.as for cumulative error,thats why manufacturers have tolerances(paraflite used to be + or - 1/2'' on trim front to back and +or-1/8inch side to side).while front to back will affect performance somewhat, the side to side can put aturn in a canopy ,which is worse. Quote Share this post Link to post Share on other sites
