The r-wing destroyer fighter was an experimental craft developed in the late stages of the rebellion. The idea was to develop a fighter that could assault a large capitol ship effectively. The r-wing has a large and powerful main gun that was capable of destroying large parts if not all of a capitol ship. However all this fire power was useless if you could not move it quickly. The designers tried to make the r-wing as fast as possible and were relatively successful since it matches the speed of the y-wing. You may think, well the Y-wing is pretty slow which is true but for the r-wing to reach these speeds is remarkable considering the amount of weight that is in the main gun. The r-wing is crewed by two, a pilot(bottom) and a gunner(top). The pilot flys the ship and controls the smaller weapons (ion cannons, and blasters), while the gunner is responsible for aiming and fireing the main gun. The r-wing did not take part in the battle over endor and the destruction of the 2nd Death Star because it was in its early test phase at that point. However it did take part in rounding up, and destroying the remnants of the empire after the battle of endor. Once a Star destroyer witnessed the fire power of the r-wing they would often opt for surrender rather than death.
With the creation of this ship also comes the announcement that I plan to create a star wars fighter for every unused letter of the alphabet. In other words for every letter besides A,b,v,x,and y.