Kite velocity

> 10 years ago
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Ganja
Ganja
WA
42 posts
WA, 42 posts
25 Aug 2009 8:11pm
How fast is a kite flying let's say in a loop? Does anyone know?
braaad
braaad
QLD
82 posts
QLD, 82 posts
25 Aug 2009 10:32pm
Kite Velocity during loop = Wind Speed x The length of a piece of string
Kitehard
Kitehard
WA
2782 posts
WA, 2782 posts
25 Aug 2009 8:37pm
Hi Ganja,

It would depend on the wind strength, atmospheric conditions, size, make and model of the kite if you wanted to get really accurate but I would hazard a guess and say just a little slower than the forward speed you were riding at when you initiated the loop.

The average rider rides at about 30-40km/h so I'd be guessing around 35 km/hr for an average rider and then varies accordingly with the above considerations.

I'd be happy to be corrected if I am way off the mark.

Cheers,

KH
sir ROWDY
sir ROWDY
WA
5378 posts
WA, 5378 posts
25 Aug 2009 9:51pm
the average rider actually rides at about 20km/h or less.
dunk
dunk
WA
88 posts
WA, 88 posts
25 Aug 2009 10:00pm
Yo Rowdy - Yo mama rides at 20kph or less...

Shoot me down bro...

sir ROWDY
sir ROWDY
WA
5378 posts
WA, 5378 posts
25 Aug 2009 10:14pm
I WOULD ride yo mama at 20kph or more if she was small enough to mount......
dunk
dunk
WA
88 posts
WA, 88 posts
25 Aug 2009 10:22pm
You go girlfriend - loop it fast then send it high...

That'll help you climb on
Ganja
Ganja
WA
42 posts
WA, 42 posts
26 Aug 2009 2:50pm
Hey guys, wou know that I was talking of the kite speed not the rider's speed, right?
I was just looking at the Reynold's number formula yesterday and as you need the airfoil's speed for it I was just wondering...

I was guessing that it should be at least 80 km/h, but that was just out of primary school thinking, I mean if you'd assume that the kite moves from one side of the wind window to the other side within 3 secs and you have an arc length of 84m (with 27m lines) then it would be 100,8km/h.
So in a loop I would be even faster, wouldn't it?
Please tell me if I'm completely wrong (which is pretty possible as I'm not so much into that maths and physics stuff especially since I'm out of school)

Oh and don't get me wrong, I'd prefer to do empirical test de facto, but unfortunately I've got another week to go here in Bavaria until I get back to hopefully windy Australia(;
whatthe
whatthe
WA
186 posts
WA, 186 posts
26 Aug 2009 3:12pm
Based on your reasonable calculation, 100km/h would be a bit high because the kite won't fly a full 180 degrees across the window, maybe only 160 degrees.
You can probably throw a criketball/baseball about 60-80 km/h and this seems like a similar speed to me. So I reckon anywhere around that number would be close to the maximum speed of the kite.

Depending on what you are trying to calculate, I don't think it will really matter if you use a number between 30km/h and 90 km/h. This is for two reasons, 1) the kite will not travel at a constant speed in the loop, it may only max out at, say, 80 km/h for a tenth of a second. So the average speed is much harder to determine. 2) You mention Reynolds number which tells me you are interested in the friction and whether the flow is laminar or turbulent. The type of flow and amount of friction is relative to the logarithm of Reynolds number, so an estimate of 30 or 90 km/h will probably give similar results for a thumb-in-air approximation.
Ganja
Ganja
WA
42 posts
WA, 42 posts
26 Aug 2009 3:23pm
Hey cool thanks!
That was really helpful information!
whatthe
whatthe
WA
186 posts
WA, 186 posts
26 Aug 2009 3:55pm
No worries
So, what are you trying to calculate other than Reynolds number?
NSW, 4382 posts
26 Aug 2009 6:45pm
Just from observation, about 60-75kph would be about on the money, has to be more than 20-35, otherwise you would end up in pendulum plonks wouldn't you?

Cya and

Goodwinds

Steve
dutchy1985
dutchy1985
213 posts
213 posts
26 Aug 2009 11:12pm
won't the outside tip be going wayyyy faster than the inside tip?
Kitehard
Kitehard
WA
2782 posts
WA, 2782 posts
27 Aug 2009 12:05am
What everyone seems to be forgetting is that the kite is in a tight turn which means the inside wingtip is stalling ie, producing a lot of drag to turn the kite. Your calculations should reflect this.

Also, the kites max speed will be fastest only for a short time of actually accelerating the rider to a downwind direction, then resistance to wind decreases ans so does apparent wind.

So are we talking maximum speed or average speed? I think there'll be a big difference between the two.

Interesting topic in a pocket protector and lab coat kind of way

KH
tightlines
tightlines
WA
3510 posts
WA, 3510 posts
27 Aug 2009 2:39am

How long is a piece of string ???????
Wow it's scary (esp when blown up) what you find when you google images for a piece of string.
Factory
Factory
WA
266 posts
WA, 266 posts
27 Aug 2009 8:30am
^^^hahahahaha NO WAY DUDE!...umm dudette!
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