Could a Paper Airplane Survive Re-entry From Space?

Paper Airplanes in Space: Early Concepts

• 🚀 The idea of flying paper airplanes from the edge of space has been explored, with projects like the Paris project in 2010 using high-altitude balloons.
• 💡 Japanese scientists even considered deploying origami paper airplanes from the International Space Station, envisioning them as traceable scientific tools.

Simulating Atmospheric Re-entry Dynamics

• 🧠 A recent study by Kojiro Suzuki and Maximilien Berthet applied deep physics numerical modeling to simulate a paper airplane's atmospheric entry.
• 📄 The paper airplane's design, with a thicker, denser nose, contributes to stability, and its low ballistic coefficient allows for rapid deceleration.
• 🛰️ Simulations at ISS altitude (400 km) showed the paper airplane initially remained stable, orienting itself towards the tenuous atmospheric stream.
• ⏳ This stable re-entry phase was estimated to take about 4 days before the atmosphere became denser.

Experimental Re-entry Testing

• 💨 As atmospheric density increased, the computer model became unstable, leading to oscillations and uncontrolled spinning.
• 🔬 To test this further, researchers used a hypersonic wind tunnel (Mach 7) to simulate high-speed atmospheric entry conditions.
• 🔥 A model paper airplane experienced shock waves and browning/charring on its surface due to heat, indicating it likely wouldn't survive intact.

Potential for Enhanced Paper Airplanes

• ✈️ While a standard paper airplane may not survive, the study suggests that a spinning or tumbling motion could increase drag and potentially aid survival.
• 🛠️ Future iterations could involve using paper-like polymers or carbon fiber composites with ablative resins to create a heat-shielding paper airplane.
• 🤔 The ultimate question remains whether a tumbling paper airplane could transition to stable, horizontal flight after surviving the initial re-entry.