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The speed of flow past the lower surface...

The speed of flow past the lower surface of a wing of an aeroplane is `50ms^(-1)`. What speed of flow over the upper surface will give a dynamic lift of `1000 pa`? Density of air `=1.3 kgm^(-3)`

Text Solution

Verified by Experts

Applying Bernoullis theorem of the lower and upper surface of a wing

`P_(1)+1/2rhv_(1)^(2)=P_(2)+1/2rhov_(2)^(2)`
or `P_(1)-P_(2)=1/2rho(v_(2)^(2)-v_(1)^(2))`
`implies1000=1/2xx1.30(v_(2)^(2)-50^(2)) [:' "lift" =P_(1)+P_(2)]`
or `v_(2)^(2)-25000=2000/1.3`
or `v_(2)=63.55m//s`
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