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====Tunnels with vertical airflow==== [[File:Vertical wind tunnel at TsAGI.jpg|right|thumb|Vertical wind tunnel T-105 at [[TsAGI|Central Aerohydrodynamic Institute]], Moscow, built in 1941 for aircraft testing]] [[File:Spin Tunnel Model - GPN-2000-001916.jpg|thumb|Model aircraft in a vertical tunnel showing parachute used to help recovery from a spin.]] Vertical wind tunnels have a test section with air flowing upwards. Photography is used to record free-flight spin characteristics of aircraft models. Nets are installed above and below the test section to prevent the model from moving too high and to catch it when the air stops flowing.<ref>{{cite book|url=https://archive.org/details/nasa_techdoc_19670012052| title=Wind Tunnels and Their Instrumentation |author1=Gorlin, S. M.|author2=Slezinger, I. I|date=1966-01-01 |page=[https://archive.org/details/nasa_techdoc_19670012052/page/n49/mode/2up 44]}}</ref>
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