I know that i need to get a wind meter but went flying today and it was 'very' windy, my power lines were screaming.
any kiting veterans have a clue what sort of wind speed would cause this with a 4.5m kite? :puzzled:kitemaker4 - 8-11-2007 at 02:01 PM
You can have the lines sing on any size kite foil or single line if the winds are right.
Susanaction jackson - 8-11-2007 at 02:07 PM
14.6 mph from the southeast w/t 68% humidity temps in the mid 60"s?.......ajGulfSandEater - 8-11-2007 at 02:13 PM
Quote:
Originally posted by action jackson
14.6 mph from the southeast w/t 68% humidity temps in the mid 60"s?.......aj
LOL...smart-arse! NPWfever - 8-11-2007 at 02:21 PM
I am just speculating but I would assume that it is when you are at maximum power for the wind speed. Kind of like a hobie cat's rudders will hum when
you are at max power. I have no idea what wind speed it would be but it is a cool experience as the sound is appealing and i love the vibration in the
handles. And I am working on a simple analog annemometor. It involves a windsock with a counterweight but i need an annemometor to calibrate it. So if
anyone in Colorado has an annemometor that would like to help me out that would be great. Also the windsock is not mine, and it is not a prototype, it
is still just an idea.
Edit: I don't know what happened to the line, but it is supposed to go from the tip of the sock, to the pulley, to the weight.
action jackson - 8-11-2007 at 02:29 PM
Quote:
Originally posted by GulfSandEater
Quote:
Originally posted by action jackson
14.6 mph from the southeast w/t 68% humidity temps in the mid 60"s?.......aj
I prefer Genius A n u s!
LOL...smart-arse!
Bladerunner - 8-11-2007 at 05:31 PM
For me. If the lines are singing it's perfect for swinging !
I feel that when the lines sing I am into the perfect power zone. Not over powered.
It has also seemed that some lines ( Q-line ) sing earlier and louder. I have kept the Q lines on my 7 even though they slow it up because I LOVE the
sonds they make.Pablo - 8-11-2007 at 07:46 PM
I'm with Snowbird, the fun starts when the lines start singing.
I'd hazard a guess that the average lines/4.5m kite would start to sing somewhere around 20mph winds. Possibly 16-18.Pdxnebula - 8-11-2007 at 08:54 PM
My ProFoil1.5mē, & the smaller 72" Quad thundefoil has had singing lines before, on thin 80lb lines in 20-25mph winds, love the sounds
they make... But with NO harness, Im sure mine dont sing like they could with one, & able to hold the power much longer & in higher steady
winds...jellis - 9-11-2007 at 12:38 AM
The problem with the singing lines is that they are twisted a bit and could be flattened by tork then they start to vibrate in the wind causing drag.
Quadrifoil did make Q-line that was perfictly round and did not flatten when tork was applied. so the idea was that this line would not vibrate and
caused less drag.
jellisBeamerBob - 9-11-2007 at 06:32 AM
I know that general motors started putting a helical raised area on vertical radio antennas to stop them from oscillating at highway speeds. The old
perfectly round ones would start to vibrate above about 45mph. The one on my new car has the helix and sits still in the wind.
If a strap is used to hold cargo on the highway, and the strap is in the wind, it will vibrate if the edge is into the wind. If you put a half twist
in the strap, the curve cancels out the vibration and it sits still.
Given these two examples, I would think that a slight twist in a flat line would make it not vibrate. Are we talking a whistling sound like the wind
would make on power lines or some other phenomenon I haven't seen yet?Mikey17 - 9-11-2007 at 12:00 PM
Quote:
Originally posted by snowbird
For me. If the lines are singing it's perfect for swinging !
I agree because judging by the jumps i was getting I was well powered! a bit daunting for a relative beginner but it allowed me to break in the new
bar and harness Pdxnebula - 12-11-2007 at 08:16 AM
Mine still dont sing that often,"Maybe because Im not strapped into a harness"??? God knows I wouldnt want to be strapped in & my lines
SINGING with a 9.0mēkite!!!jellis - 12-11-2007 at 09:43 AM
I disagree the with the idea that a helical raised area or a twisted ribbon is less drag than a round one. I never noticed my antenna oscillating in
the wind except when it was coated with ice and had an irregular shape. When your lines sing is there a certain tune you hear? If so please buggy
with AJ.
jellisBeamerBob - 12-11-2007 at 11:19 AM
Look back at my post and you will see I didn't say anything about drag. Yes the helix would increase drag because it increases frontal area. My
comment was that the helix prevents the radio antennae from oscillating. Therefore a flat line with a twist in it should help prevent a vibrating
oscillation.
To prove my point, check the straps that hold a load on a flatbed tractor trailer sometime. The strap that is flat with an edge into the wind will
oscillate, while the one with a half twist will almost sit still.
