---
title: NASA paints wing pink to see invisible forces
url: https://www.elseif.net/nasa-paints-wing-pink-to-see-invisible-forces
published: 2026-10-13T20:07:11+00:00
language: en
section: Models
source: https://spidersweb.pl/2026/10/swiecace-skrzydlo-tunel-aerodynamiczny.html
organizations: NASA, Langley Research Center, Transonic Dynamics Tunnel, uPSP, R-134a
publisher: elseif
---

# NASA paints wing pink to see invisible forces

NASA painted a wing pink to visualize invisible forces. The experiment took place in a wind tunnel at the Langley Research Center in Virginia. The painted wing glows pink violet under special lighting. The paint changes brightness according to pressure on the surface. High pressure makes the paint darker while low pressure makes it brighter. Fast cameras recorded thousands of pressure changes that point sensors would miss. The entire wing surface became a pressure sensor. Traditional pressure measurements use many small holes and separate wires. Those sensors only capture data at discrete points. The new technique shows pressure distribution across the whole surface.

The test used a special pressure sensitive paint called uPSP. The paint emits light when illuminated and its intensity depends on oxygen reaching luminescent molecules in the coating. Higher pressure increases oxygen flow and reduces light intensity. Lower pressure increases brightness. This eliminates the need for hundreds of individual sensors and wiring. The experiment was conducted in the Transonic Dynamics Tunnel which can accelerate flow to about Mach 1.2. The tunnel can also use heavy gas R-134a to simulate full scale aircraft behavior on a smaller model. The paint is sensitive to oxygen and needed a special formulation for the low oxygen environment.

Ultraviolet lighting made the wing glow pink violet during the test. The technique allows researchers to study aeroelasticity which is the interaction between aerodynamic forces and structural deformation. Engineers want to build longer lighter wings that reduce drag and fuel consumption. Future aircraft may actively control airflow around the wing instead of relying only on flaps. The new method collects data up to ten thousand times faster than older approaches. Data resolution has improved by about a thousand times. Results can now be obtained after minutes instead of days or weeks.