The flow around the jet plane flying at an altitude of 10 km is to be studied using a wind tunnel and a model that is built to a 1/15 scale. If the plane has an air speed of 800 km/h, what should be...

The flow around the jet plane flying at an altitude of 10 km is to be studied using a wind tunnel and a model that is built to a 1/15 scale. If the plane has an air speed of 800 km/h, what should be the speed of the air inside the tunnel? Is this reasonable?

If the drag on a 15-m-long airplane is to be determined when the plane is flying at 1200 km/h at an altitude of 10 km, find the speed of the air in a wind tunnel for a 1.5-m-long model if the air has a temperature of 20°C at standard atmospheric pressure.