edt wrote: ↑Wed Jan 15, 2020 1:33 am
a sphere is around .5 something like that but a cylinder is somewhere around 1.2 something like that, correct me if I'm wrong. also typical cruising speed of a kiter is 20 knots so you want to compare 20 knots to 33 knots something like that. I just now from personal experience I start feeling the drag on the lines when you get above 50 meters.
Good catch, you’re right.
https://www.engineeringtoolbox.com/drag ... d_627.html
Wires and Cables Cd = 1.0 - 1.3
Drag = 0.5 x Drag Coefficient x Area x Density x Velocity²
Drag Coefficent of a Wire = 1.2
Kite Line Diameter = 0.0015 m
Line Area = (200m x 4) x 0.0015 = 1.2 m²
Air Density = 1.225 kg/m³
Velocity = X m/s
At 9.7Kts, 5m/s
Line Drag = 22.05N = Weight of 2.25kg or 4.96lbs
So at 13.6Kts, 7m/s
Line Drag = 43.2N = Weight of 4.41kg or 9.72lbs
So at 15.5Kts, 8m/s
Line Drag = 56.45N = Weight of 5.75kg or 12.70lbs
So at 19.4Kts, 10m/s
Line Drag = 88N = Weight of 9kg or 20lbs
The rider pulls half the drag and the kite pulls half the drag, so if you could get to 20kts that would be a lot of added drag the kite would need to overcome. I’d assume when sining the kite, drag would quickly limit the velocity. At the sine peak, when velocity seen by the kite is a minimum, the drag may overcome lift needed and