I'm super new to Solidworks and haven't been able to find any resources for this question.

I already imported an airfoil and converted the entity. 

The airfoil's chord length is only 1 inch, and I'm trying to increase it to 4.25 inches. I tried Smart Dimension, but it will not change the scale. (It says it will become overdefined and unable to solve.)

I can't selected "Scale Entities" because the option is light grey and unselectable. No side comment appears as to why, to explain why I can't select Scale Entities. I'm on a plane already, if that helps.

Please, someone, help. And thank you. #airfoil