On the other hand, gravity pulls the sail back toward the Sun.
      Using the values

             G  =  6.67 x 10^(-11)   N*kg^2/m^2

             M  =  2 x 10^(30)       kg            solar mass

             R  =  6.95 x 10^(8)     m             solar radius



   Q:   What is the force of gravity on the sail?


                          G * M * m
            F(grav)  =   -----------  
                            R^2


              
                     =    11.8  N      toward the Sun


   Q:   If we place the sail next to the Sun, and release it
           from rest ... what happens?


 
              Net force   =   0.28 N (outward)  -  11.8 N (inward)

                          =    -11.5 N  (inward)

     
           It seems that this sail won't fly away from the Sun.