John Barresi Posted January 27, 2018 Report Share Posted January 27, 2018 Just weighing spars this morning, thought you all might enjoy the data... Bear in mind, Rev rods tend to have a lot more variance from spar to spar (hand wrapped) and I didn’t weigh multiples of the same so this should serve as a flexible reference only. Note: “NEW” indicates the latest model spars with green stripes on either side of the label, the other references indicate silver (semi-recent) or gold (original) labels. Diamond OG 10.07 gr Diamond NEW 10.07 gr Black Race OG 11.93 gr Black Race NEW 12.00 gr 2 wrap OLD gold (no data) 2 wrap OLD silver (no data) 2 wrap NEW 10.74 gr 3 wrap OLD gold 15.96 gr 3 wrap OLD silver 18.67 3 wrap NEW 12.73 gr 4 wrap OLD gold (no data) 4 wrap OLD gold (no data) 4 wrap NEW (no data) SPL white coat 14.38 gr 2P Skyshark 7.97 gr P90 Skyshark 10.34 gr P100 Skyshark 13.11 gr P200 Skyshark 15.20 gr P300 Skyshark 16.69 gr P400 Skyshark 17.41 gr Dynamic D8 12.92 gr Dynamic D12 13.06 gr Dynamic D15 16.01 gr Dynamic D18 18.38 gr 1 Quote Link to comment Share on other sites More sharing options...
Flintfootfilly Posted January 27, 2018 Report Share Posted January 27, 2018 Thanks! Been meaning to weigh mine for a while. Sent from my [device_name] using http://KiteLife mobile app 1 Quote Link to comment Share on other sites More sharing options...
John Barresi Posted January 27, 2018 Author Report Share Posted January 27, 2018 Note, weight is only one factor... When selecting quad spars for me and my team, we look at: 1 - stiffness, actual resistance to bending 2 - recoil, spar memory / back to straight 3 - resilience, resistance to flexed breakage 4 - weight if I had to prioritize, I’d lean toward factors 1 and 2, weight isn’t as big a factor if (a) the kite is designed well and (b) it’s tuned correctly... A good “engine” can move a lot of weight. 1 Quote Link to comment Share on other sites More sharing options...
SparkieRob Posted January 27, 2018 Report Share Posted January 27, 2018 I'll see if I can fill the blanks later. Assuming, in ferruled spar? Sent from a Galaxy 8 Far Far Down Under. 1 Quote Link to comment Share on other sites More sharing options...
John Barresi Posted January 28, 2018 Author Report Share Posted January 28, 2018 Non-ferruled, 31”. 👍🏻 Choice of ferrule material varies greatly, not worth trying to track that in these numbers I think. Quote Link to comment Share on other sites More sharing options...
Russ Wilson Posted January 30, 2018 Report Share Posted January 30, 2018 Very interesting information - wondering if anyone has set standards for measuring the other 3 factors mentioned? In principle, stiffness could probably be quantified by cantilevering the rod, hanging a standardized weight from the end, and then measuring deflection. Not sure how to measure recoil, but I inadvertently tested my diamond frame for resilience a few weeks ago. Unfortunately, that was a destructive test 2 Quote Link to comment Share on other sites More sharing options...
Wayne Dowler Posted January 30, 2018 Report Share Posted January 30, 2018 I'm pretty much in JB's corner here - I'm not so worried about weight as I am kite. To me it is all about what produces the "feel" that I like, not hung up on the weight. My Zen is a veritable tank, weighing in very hefty. My SUL feels like a feather - guess which I want to fly more? The Zen has a bunch more sail area and the frame I'm using is very efficient in using wind. Gimme the feels!!! 2 Quote Link to comment Share on other sites More sharing options...
John Barresi Posted January 30, 2018 Author Report Share Posted January 30, 2018 The recoil (spring) factor is one that NONE of the manufacturers I’ve spoken with seem to be able to translate on a technical end - Rev’s original diamond and race rods for example, are among the best in this category but I can’t seem to find (or request) it elsewhere.To that end however, we’ve been prototyping the Djinn on nothing but P100-P400 and the new Sync bridle doesn’t require the same sort of recoil (different loading / support) so it’s almost moot for me now, to a point.Sent from my iPhone using KiteLife mobile app Quote Link to comment Share on other sites More sharing options...
Russ Wilson Posted January 30, 2018 Report Share Posted January 30, 2018 Now that I have a few extraneous diamond rods laying around, I may try to work up some kind of recoil test using them (won't hurt my feelings if they snap). Seems like a rotary encoder and lever arm might be able to measure recoil - just need to make sure the data acquisition is fast enough to capture the spring back. Hmmmmmmm.... Glad to hear you are using SkyShark on the Djinn - that's where my money is going these days too. Looking forward to the first order of Djinn's 1 Quote Link to comment Share on other sites More sharing options...
SegelFlieger Posted January 30, 2018 Report Share Posted January 30, 2018 Here is a blog I posted a while back regarding dynamic testing of spars along with weights and deflection information: 1 Quote Link to comment Share on other sites More sharing options...
Russ Wilson Posted January 30, 2018 Report Share Posted January 30, 2018 Sweet - thanks for pointing me to your writeup. Quote Link to comment Share on other sites More sharing options...
mrfaosfx Posted June 4, 2018 Report Share Posted June 4, 2018 On 1/27/2018 at 4:21 PM, John Barresi said: Note, weight is only one factor... When selecting quad spars for me and my team, we look at: 1 - stiffness, actual resistance to bending 2 - recoil, spar memory / back to straight 3 - resilience, resistance to flexed breakage 4 - weight if I had to prioritize, I’d lean toward factors 1 and 2, weight isn’t as big a factor if (a) the kite is designed well and (b) it’s tuned correctly... A good “engine” can move a lot of weight. so very true ... I built a yellow Vickie out of 4oz ripstop and had someone actually tell me ... well, the kite is going to be too heavy for the wind and I told him "is weight really a factor when you're out flying this kite in 25mph winds??" we both laughed. 1 Quote Link to comment Share on other sites More sharing options...
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