Fan power required to suspend a flying squirrel mid-air in a vertical wind tunnel

I currently own three sugar gliders (a type of gliding possum similar to a flying squirrel) and am wondering about the logistics of making a vertical wind tunnel for them to fly around in (like the kind used for indoor skydiving in this OkGo music video).

Based on wikipedia, an adult sugar glider weighs ~140 g and when its wings are unfurled into a rectangular shape (like a flying fuzzy pancake), their surface area is roughly 70 cm^2 (according to this paper). The round fan at the base of the wind tunnel would hopefully have a diameter between 0.5 to 1 meter to give the gliders enough room to fly around in.

I was wondering how to calculate what wind speed would be sufficient to create a net upward force on a rectangular surface roughly the same size and weight of a sugar glider (no need for fancy aerodynamics, just a ballpark). Roughly what fan size or speed would be needed to accomplish this? I'd love to try this out if it is doable. Cheers! :)

My attempt so far: To suspend a glider, Fnet = Fgravity + Fwind resistance Fgravity = mg = 0.140 g * 9.807 m/s^2 = +1.373 N

Fwind resistance = -1.373 N = 0.5(air density)(drag coefficient)(area) solve for velocity: velocity = sqrt[2.746/[(air density)(drag coefficient)(area)]] = sqrt[2.746/[(1.2 kg/m^3)(1.17)(0.0070 m^2)]] = 16.72 m/s (^ using this formula, the air density at sea level, approximate drag coefficient of a perpendicular square plate, and area of the glider wings mentioned earlier)

Looking at some household fans, it seems like 7 m/s is the higher end of fan speed. Is it possible to double up fan speed by stacking two fans? How could one realistically achieve ~17 m/s (if my math is right)?

Posted Dec 16, 2018, 11:13 PM UTC · edited

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