Can any suggest the Best motor and Propeller combination for a electric powered glider

Hi,

I am currently doing a project for university, my criteria are 4m wingspan and 20 W/lb and max speed of 49 km/h, I have to make an electric glider within those limits. I have found a propeller that should work, the GWS-RS 12x8.

I have calculated a rough weight of 1.5 kg. I have a desired current per motor of 6A.

Can anyone help me find a motor that would be suitable for my plane?