Inflatables have a vastly superior lifespan cf ram airs
Carlos_C wrote: ↑
Fri Mar 27, 2020 9:53 am
In my experience foil kites would start showing signs of age at 100 hours. LEI kites are still going strong at over 200 hours.
After several weeks of use, ram air bridles typically stretch and deform, further compromising aerodynamic performance: http://www.kiteforum.com/viewtopic.php? ... 58&start=0
Kamikuza wrote:Have you done a mixer test and checked your SPL length? SPL = spare parts line = the bright yellow lines that go through the pulleys... they can shrink A LOT and bork up the handling…
joffaburger wrote:Moved to a foil kite 5 years ago (flysurfer pulse 10m)... I found after 6-9 months that the RAM started performing very poorly especially in gusty conditions I assume this was due to bridle stretching, I did manage to trim the bridle regularly to what I thought was intended spec however as already stated these are complicated bridles with many attachment points and I'm not sure if I did a perfect job! In the end I couldn't get the kite to feel anywhere near how it performed during the first 3 - 6 months of it's life. I think the kite and the bridles became quickly blown out...The kite was expensive and an attempt to resell the kite at half its purchase price failed...
plummet wrote:Hey bro's. I'd like to make my speed 3 less stally. Apart from resetting the mixer what else do you recommend?
Is it simply a matter of lengthening the rearlines or shortening the front?
Should I lengthen the Z line abit?
I am assuming a few things:
1) You have reset the mixer to 0
2) You have compensated for Back line shrinkage by shortening your front lines using the Black Line above the adjuster. Front and Back lines should be the same length when the Adjuster is fully open and the bar is pulled all the way down to the chicken loop. Best to tie up the end of the lines to a tree or other solid stationary object to test this.
So. If the kite is still to backstally, try lengthening C. B will adjust itself harmonically by itself. This will sacrifice a bit of stability, but will give you less backstall. Lengthing Z will just make the kite turn slower and will also reduce the Low end of the kite.
For the complete discussion on the diabolical problems associated with "resetting the mixer,” ”compensating for line shrinkage,” “adjusting the adjuster,” “adjusting lines "C", "B", & “Z,” & trying to stop ram airs from back stalling, check out: http://www.kiteforum.com/viewtopic.php? ... 91#p778491
Contrary to the propaganda of ram lovers, ram airs have inferior lifespans compared to inflatables. The initial cost of ram airs is ~ 2-3x that of inflatables and their relatively greater depreciation over 2-3 years means you LOSE a lot more $. Also, a major determinant of lifespan is obsolescence. In 2-3 years, today's kites will be superseded and won't be worth much. In addition, bridled ram airs lose performance quickly because of bridle stretching (see "bridle stretching" above).
REPAIRS & COMPLEXITY
Ram airs are shockingly complex. They have over 1000 parts, many of which require regular tweaking e.g. http://www.kiteforum.com/viewtopic.php?f=1&t=2374470
Ram air repairs are a LOT more expensive eg http://www.kiteforum.com/viewtopic.php?t=4612
Trained PARACHUTE repairers are often needed for big rips. Bills >$1000 are common, eg http://www.kiteforum.com/viewtopic.php?f=1&t=2348790
Ram air companies sometimes refuse to honour warranties, e.g. the case above where the kite was <1 year old. A large part of the reason for Flysurfer and other ram air kites "exploding" is their rapid deterioration caused by salt water and UV radiation.
And the lies.
Of ram airs ignore.