Old 10-02-2018, 07:21 AM
  #4  
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 12,522
Default

There is one inherent problem with sharp LE ... critical angle to airflow.

As Q mentions - there is a sharp change in its ability to sustain lift.

It is actually not correct to say a fast aircraft has a sharp LE ........ what is true is that such aircraft have a THIN wing .... the old EE Lightning is a prime example of this. BUT they still had ROUNDED LE for very good reason.

As the wing angle of attack changes - the LE presents a different attitude to the oncoming airflow. If its rounded - the airflow will remain good for a reasonable change of angle, but make that LE sharp - a small change in angle of attack and now you have a turbulent disrupted airflow.

The sharp entry would only benefit 'maybe' in perfectly straight level flight with no requirement to pitch up / down.

Its actually a phenomenon we see with flat plate wings when you don't sand a rounded LE.

Nigel
solentlife is online now  
 
Page generated in 0.06455 seconds with 8 queries