Wind resistance
At Shapeheart, we love a good calculation.
So let's lay them out to explain how our patented magnet system is capable of lifting more than 8 kg and continues to withstand wind speed.
We also explain all of this in a video 👉
Formula
In turbulent flow, the force exerted by the wind on the sleeve is expressed as shown opposite.
Don't panic — we detail all the parameters below:
• r being the air density = 1.292 kg.m-3
• v being the speed in m.s-1
• S the surface area of the sleeve = 18 * 10 cm2
• Cx the drag coefficient = 1.1
• F being the force expressed in Newtons
For 8 kg = 80 N (N for Newton) of force from our magnetic system, the maximum theoretical speed is therefore obtained with the formula:.
Maximum theoretical speed
If we plot this curve, we get:
on the Y axis: speed
on the X axis: magnetic force in N
Which gives, for 80 N or 8 kg of force from the magnetic system, a speed of 285 km/h:
It should be noted that in practice, this speed is likely twice as high:
The phone never sits at 90° (vertically) relative to the wind, but rather at 45° — the motorcycle's structure breaks up and slows the airflow near the handlebar
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