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New Sail Rattle

Posted: Tue, Jul 26 2011, 01:23 PM
by Elix
I don't have a lot of hands-on or on-site Rev experience, but I have seen more than a few Rev videos. Based on that, I'm here to ask IKE for advice. I've had my kite out 4 times now (for a total of about 3 hours of 5-15 mph flight) and I feel like it rattles too much in forward flight. I'm aware that if you have no pressure on the reverse lines, the sail can flutter. In my case it feels like anything above 50% forward speed gives me the raspberries. Do I really need to tighten a 2 week old sail? Is there a ground-based procedure I can do that will show if my sail is too loose, and in which directions?

Linking to a video for reference where I'm attempting to find the right balance between forward speed and silence. Volume is light, so turn it up. I figure dive-stop rattle might be inescapable, but there are plenty of other times in the video where you can hear chatter.
http://www.youtube.com/watch?v=ooIKfrs2gM4

Re: New Sail Rattle

Posted: Tue, Jul 26 2011, 02:08 PM
by Darkspark
A couple things you can check.
Make sure the bridal lines are coming off the endcaps cleanly, with no wraps. And make sure the center connection (bridal to sail /leading edge) hasn't come loose.
When you put your endcaps on, there should be enough stretch in the bungies to pull them just past the spar with out working too hard. If they go way past it is possible they need a bit of tightening. Too tight is bad , so don't over do it.
It is hard to tell in the video, but it doesn't seem to have a bunch of excess rattling. particularly for the lighter winds.
Would have to see it in person to be sure though.

Re: New Sail Rattle

Posted: Tue, Jul 26 2011, 03:13 PM
by Mike
Hi Chris,
what knot are you flying on your handles?
If the bridle check that Mikey mentioned above is OK, my guess is that the kite is ok.

Re: New Sail Rattle

Posted: Tue, Jul 26 2011, 04:04 PM
by Elix
Farthest knot out on top lines. Farthest in on bottom lines.

Re: New Sail Rattle

Posted: Tue, Jul 26 2011, 06:36 PM
by Mike
Hmmm, that sounds good then. Unless you're choking up on the handles so far that your index finger is on top of the handle :)
I had a Blast that was constructed wrong or something and had a lot of flutter on the trailing edge. So much, that it actually ripped. Rev fixed it for free. I've never heard of anyone else having that problem though.
Maybe you'll run into another Rev when you're at the beach in NC and you can compare.

Re: New Sail Rattle

Posted: Wed, Jul 27 2011, 10:27 PM
by cadguy
Something else to check: are your lines all equal length? More specifically, are the tops the same length as the bottoms.
Your top lines may have streatched more than the bottom lines. Resulting in slack brake (bottom) lines. Been there, heard it.
Solution: swap the top lines to the bottom and bottom lines to the top.

David

Re: New Sail Rattle

Posted: Thu, Jul 28 2011, 01:34 PM
by Mike
Ooh, good call David!

Re: New Sail Rattle

Posted: Thu, Jul 28 2011, 03:09 PM
by goestoeleven
Or . . . since this is a new kite, maybe they are still the same length (or at least close). You could try moving in a few knots on the top (or out a couple on the bottom), since you are "all the way out" at the top, and "all the way in" at the bottom. That would take out a little of any "extra" length on the tops if they are stretched.