I have known that the pulleylines that slingshot uses on its kites shrink with use. I can confirm that the amsteel that Eclipse uses on its kites, also shrinks with age. I've measured the length of the pulleylines on some Eclipse kites. The ones that are labeled fuzz have most likely shrunk, of a length yet to be determined. I did find that a well used 9M Kima shrank more than 13-17 cm. I suspect that as the pulleyline shrinks on an Eclipse kite, the bar pressure will go up. The change is gradual, so is probably difficult to notice. If others wish to share the length of your pulleylines in this thread, please specify kite model, size, and year.
2007 6M Nano = 243 cm (fuzz) (appended 3/22/2010)
2008 4M Nano = 188 cm
2008 6M Nano = 231 cm
2008 8M Thruster = 149 cm (fuzz)
2009 4M Kima = 105 cm
2009 6M Thruster = 128 cm (fuzz)
2009 9M Nano = 236 cm
2009 9M Kima = 313 cm (fuzz) too short! ; currently trying 322 cm (appended 5/3/2013)
2010 10M Thruster = 165 cm (fuzz) (appended 3/22/2010)
If you want to bring your Eclipse kite back to stock, you can flip the pulleyline (to reverse the wear area), then attach a pigtail on the steering lines (larkshead the pulleyline to the pigtail), of corresponding length to bring the pulleyline length back up near stock length. You can lay the kite on its back and pull the front lines with one hand and rear lines with the other and look at the tension of the pulleyline. You want the tension in all the bridle lines to be similar, and not have the pulleyline be too taunt. Be sure to check for symmetry, as I've found differences.
Edit 5/9/2013: It is better to put the pigtail on the front flying line side, rather than the steering line side (putting the pigtail on the steering side will limit depower and negatively affect relaunch).
Edit 5/10/2013: I've found the best way to tune the kite is to fly without the pulleyline, to find the optimal trim between front and rear lines. Next add the trimline. If the pulleyline is too short, you'll get backstall and high bar pressure. It the pulleyline is too long, the steering speed will be slower.
If a kite manufacturer reads this, please publish the bridle lines for your kites, either in your manual, or on your website. Flysurfer has been making bridled kites longer than anyone, and has always published the bridle lines for their kites (for models 10 years or newer). Bridle lines that go through pulleys will shrink, bringing the kite out of tune.
Last edited by sflinux
on Fri May 10, 2013 4:09 pm, edited 10 times in total.