Winglet Question from a university exam...
Hi guys, I need some urgent help.
I have recently sat an Aerodynamics exam at university. I went to check my script today and I think that it has not been marked correctly. Here's the problem:
For the question: "Describe performance benefits of aircraft winglets"
1 of the things I answered was something like this: "Winglets reduce the size of trailing edge vortecies, hence reducing pressure drag"
Is this not right? I scored zero points for this.
Another 2 things I said were that depending on the size and angle relative to the wing, winglets can create an adheral or dihedral effect therefore improving or decreasing the stability of the a/c.
And also, that air which is bleeding off the wingtip could be used by a winglet to create extra lift and therefore increase efficiency.
Is everything that I said incorrect?