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Frame Stress From High Winds


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Poll: Rev Arcana Poll Version 1.0 alpha (42 member(s) have cast votes)

Which parts of the Rev 1.5's frame are most apt to be riven asunder by the raw elemental fury of high winds?

  1. The vertical spars. (24 votes [55.81%])

    Percentage of vote: 55.81%

  2. The leading edge spars. (11 votes [25.58%])

    Percentage of vote: 25.58%

  3. liek who carez LOL (8 votes [18.60%])

    Percentage of vote: 18.60%

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#81 stroke survivor

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Posted 07 March 2011 - 10:50 AM

More practice!!!!!!:kid_devlish:

wayne from portland
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#82 hyzakite

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Posted 07 March 2011 - 01:03 PM

I have a nice, accurate digital scale that covers this range of weights. Now, if anyone would like to send me a set of each, I would certainly be glad to weigh them and let you know... Posted Image





Pete, I mailed them out this morning overnight express for accurate weighing, it's getting to be that time of the year so upon returning them, don't get them confused with pussy willows. Posted Image

#83 Felix Mottram

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Posted 07 March 2011 - 01:15 PM

Hey, how about me ? Just kidding Pete. Why does "Felix" want the weights of the race rods? Is it just because he sees a difference in their performance, or is it a weight thing?


I am merely curious about any weight difference between Race and Green Race rods as I do find an apparent 'visible' and tactile difference in the flex when the frames are flown in similar sails in close proximity as was the case yesterday. I switched frames in the kite that I was flying and sensed that the LE stayed straighter with the green rods. Now this may not be so good for directional stability and the probably small keel effect of the upright spars but somehow the quicker snap back to an 'apparently' not stressed frame/sail combo felt better.

Slack sails and bendy spars just do not feel good to me but I am not keen on heavier spars! <grins>

Fighter kites with bamboo spars are sheer magic, of course, as it is possible, for those that know how, to adjust the flex of the bamboo on either side of the kite in order to ensure that it will fly in a straight line...

Felix

#84 hyzakite

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Posted 07 March 2011 - 02:28 PM

I have some green rods at 14 grams some at 16 grams, most of my black race rods run around 14 grams, I have some 2-wrap rods at 12 grams and some as high as 16 grams, those are all without ferrals, the lightest frame I have for 5 rods is a 2-wrap frame with a total weight of 72 grams. So I'm thinking the weight of rods depends on who's running the machine and the time of day, or day of the week type stuff.

#85 Reef Runner

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Posted 07 March 2011 - 03:37 PM

I have some green rods at 14 grams some at 16 grams, most of my black race rods run around 14 grams, I have some 2-wrap rods at 12 grams and some as high as 16 grams, those are all without ferrals, the lightest frame I have for 5 rods is a 2-wrap frame with a total weight of 72 grams. So I'm thinking the weight of rods depends on who's running the machine and the time of day, or day of the week type stuff.


That's exactly the point that I was trying to get across, in my earlier post >>> " P R O C E S S ~ V A R I A T I O N "
~~~~~~~~~~~~~~~~
Couldn't Revolution supply you with the actual weight, of the different rod types? Weighing one individual set of rods, really isn't very accurate, as I am sure there is a bit of variation, within individual rods, as well as from rod to rod. The best case scenario, would be for someone, with access to lots and lots of rods, to weight at least a 25, or 50, or even 100 rods, all at one time, and then do the math to come up with a realistic average weight per rod. Then you need to do the same thing with the ferrules, which are used in the center sections, so that two of those weights, could be added to 5 of the rod weights, to come up with an accurate weight for a set (whatever set you may be interested in)..............

Seems like some information, that the quality control area, at Revolution Kites, should have privy to, (or Ben), if that isn't proprietary information...........

Just a suggestion.............
Posted Image
~~~~~~~~~~~~~~~~

So what's going on here? Is the manufacturer actually making the correct product, as the specs call for ? I know for a fact, that 14 to 16 grams difference (2 grams or 14.3% variation) in one product, and 12 to 16 grams difference (4 grams or 33.3% variation), would NOT be acceptable, in most manufacturing situations. So what's the point in having specs, and labeling rods, with this kind of variation ? I'm just curious if anyone really knows, what we are getting? Surely, someone has got to have their eye on the "ball", here, or at least be aware of what is being manufactured.

I'm not trying to be critical, here, but assuming that "hyzakite's" weights are correct, something is bad wrong, (IMHO) !! Posted Image

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#86 RevWizard

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Posted 07 March 2011 - 06:41 PM

For me, being one of the most experience REV fliers out there, it really does not matter to me if the rod varies 2 grams either side of 14 grams.
Can I notice the difference in how the REV flies? No!

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#87 --Pete

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Posted 07 March 2011 - 09:14 PM

I'm beginning to suspect that for "flyability" it would be the flex-under-load that makes the most difference (within a given rod category). Let me play with my 3-wrap and 4-wrap rods and come up with a "standard" for distance and weight that deflects rods of different classes without over-stressing them. I'll get back tomorrow with some ideas and photos.
--Pete
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#88 Reef Runner

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Posted 08 March 2011 - 07:31 AM

For me, being one of the most experience REV fliers out there, it really does not matter to me if the rod varies 2 grams either side of 14 grams.
Can I notice the difference in how the REV flies? No!


Hi John,
I couldn't agree with you more, and I surely can't claim, any where near the experience, that you have. I was really just commenting on the level of variation, which I really don't understand, nor do I think it should exist, to that extent, anyway. But, as long as no one has a problem, I suppose, you get what you get !! It still doesn't seem right, though !! Posted Image Posted Image

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#89 Felix Mottram

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Posted 08 March 2011 - 07:56 AM

For me, being one of the most experience REV fliers out there, it really does not matter to me if the rod varies 2 grams either side of 14 grams.
Can I notice the difference in how the REV flies? No!


Hi John,

As I said, I was curious about the relative weight whether it has an impact or not. The different flex characteristics are much more important and can, in my experience, be clearly 'felt' and seen in the curvature of the LE.

I would note also that experienced fliers may have the ability to compensate for all sorts of 'differences' in configurations of lines and spars. <grins>

Felix

#90 katrina

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Posted 31 March 2011 - 10:53 AM

I have some green rods at 14 grams some at 16 grams, most of my black race rods run around 14 grams

I had to go weigh my black race rods after reading this. They are 13 g each, using a digital scale which measures to the nearest gram. All four together weigh 52 grams, which supports the individual measurements.

2 wraps: 14.6 g (averaged; weighed all 8 and divided), mostly 14g individually, but one 15, and 2 were 16 (no, not the centers!) And here I'd thought my 2 wraps were lighter than the race. Not so.
3 wraps: 18.3 averaged.

I also weighed complete sets, and found that sets of 2 wraps and black race rods weigh the same! 77g. The race center is 4 g heavier than the 2 wrap ctr, which makes up the difference. A set of 3 wraps weighs 103g. Now I know the whole point was to compare green to black race, but I'm sorry I don't have greens.

Just pretend all my statements are prefaced with IIRC, AFAIK, IMHO, and end with "Just my $.02," okay?
(And stop asking for cookies, all you new darkside converts! It was all just a ruse to get you here!)

Posted ImagePosted ImagePosted ImagePosted Image


#91 Felix Mottram

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Posted 31 March 2011 - 11:22 AM

I had to go weigh my black race rods after reading this. They are 13 g each, using a digital scale which measures to the nearest gram. All four together weigh 52 grams, which supports the individual measurements.

2 wraps: 14.6 g (averaged; weighed all 8 and divided), mostly 14g individually, but one 15, and 2 were 16 (no, not the centers!) And here I'd thought my 2 wraps were lighter than the race. Not so.
3 wraps: 18.3 averaged.

I also weighed complete sets, and found that sets of 2 wraps and black race rods weigh the same! 77g. The race center is 4 g heavier than the 2 wrap ctr, which makes up the difference. A set of 3 wraps weighs 103g. Now I know the whole point was to compare green to black race, but I'm sorry I don't have greens.


Thanks for the information anyway. Maybe someone will come by soon with the weight of a set of green rods. As I said, it seems to me that the flex of the rods is important! [EDIT actually the weight of green rods is pointed out up-thread as being variable as with other rods so 'flex' is the concern...]

Felix

#92 Felix Mottram

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Posted 04 April 2011 - 11:26 AM

I'm beginning to suspect that for "flyability" it would be the flex-under-load that makes the most difference (within a given rod category). Let me play with my 3-wrap and 4-wrap rods and come up with a "standard" for distance and weight that deflects rods of different classes without over-stressing them. I'll get back tomorrow with some ideas and photos.


Hi Pete,

Did you post your results? I seem to have missed them...

Thanks

Felix

#93 --Pete

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Posted 04 April 2011 - 01:20 PM

I only have 3- and 4-wrap sets (plus an elderly Rev I set; dunno how age affects rods) so I hadn't gone beyond designing a repeatable/specifiable test for flex under load.

I can run some tests, and post the distance between supports, a suitable load weight, and a method of measurement.

Sorry for not getting with this, but I've been fairly seriously distracted: I'm going in for surgery in a couple of weeks to remove a small cancer from a kidney. Doctors say it is easy surgery, generally successful, and short recovery (with no chemo or radiation needed), so I am treating it mostly as a nuisance. However, the number of required pre-op conferences, meetings, consultations and tests are quite time-consuming. I expect to make it to Grand Haven on May 20-22, so you can see that I'm not worried.
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#94 fungus

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Posted 04 April 2011 - 11:12 PM

Hi Pete
good luck with the surgery

Hi All
a very interesting thread, i'm a simpleton ie exp frame is too bendy SLE is too stiff, anything else i trust REV,
SUL - 2 wrap , STD - 3 wrap, VENT 4 wrap or black race, i want to be able to grab a kite from the bag and fly

fungusPosted Image


wHind cHecks Har4 wHimps

#95 ahofer

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Posted 05 April 2011 - 02:11 AM

Best wishes for a speedy recovery, Pete.
When I was young, my bologna had a first name. Now my bodywash has an "Objective".

#96 Felix Mottram

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Posted 05 April 2011 - 05:27 AM

I only have 3- and 4-wrap sets (plus an elderly Rev I set; dunno how age affects rods) so I hadn't gone beyond designing a repeatable/specifiable test for flex under load.

I can run some tests, and post the distance between supports, a suitable load weight, and a method of measurement.

Sorry for not getting with this, but I've been fairly seriously distracted: I'm going in for surgery in a couple of weeks to remove a small cancer from a kidney. Doctors say it is easy surgery, generally successful, and short recovery (with no chemo or radiation needed), so I am treating it mostly as a nuisance. However, the number of required pre-op conferences, meetings, consultations and tests are quite time-consuming. I expect to make it to Grand Haven on May 20-22, so you can see that I'm not worried.


Best wishes for a speedy recovery.

Felix

#97 stroke survivor

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Posted 05 April 2011 - 08:27 AM

My wishes go with you!! Posted Image

wayne from portland
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