Whip's Rangefinder for the GAW [SpaceEngineers]

/*
/// Whip's Rangefinder Script v1.1 - 9/20/15 ///
Made for the GAW Platform

*/

string mergeName ="Merge - Type A (GAW1)"; //vector head
string timerName = "Timer - Projectile Selecter (GAW1)"; //vector tail
string projectorName = "Projector - Reticle Aperture (Right)";
string rotorName = "Rotor - Reticle (Right) (GAW1)";

double projectorOffset;
double rotorOffset;

void Main()
{
    var projector = GridTerminalSystem.GetBlockWithName(projectorName) as IMyProjector;
    var rotor = GridTerminalSystem.GetBlockWithName(rotorName) as IMyMotorStator;
    var shipVectorTail = GridTerminalSystem.GetBlockWithName(timerName);
    var shipVectorHead = GridTerminalSystem.GetBlockWithName(mergeName);

    projectorOffset = (double)projector.ProjectionOffsetZ;
    rotorOffset = (double)rotor.Displacement + .045; //.045 is rotor offset factor

    double A = 5;
    double B = 5 + .5 * projectorOffset;
    double C = 5 - rotorOffset;
    double D = A-C; //XD double d's hehe... i need help

    if (D > 0)
    {
        double distance = A*B/D;
        Echo("Distance: " + distance.ToString());
    }else{
        Echo("Distance: Infinity");
    }

    Vector3D shipVectorHeadPos = new Vector3D(0, 0, 0);
    Vector3D shipVectorTailPos = new Vector3D(0, 0, 0);
    Vector3D shipVectorFinal = new Vector3D(0, 0, 0);

    shipVectorHeadPos = shipVectorHead.GetPosition();
    shipVectorTailPos = shipVectorTail.GetPosition();
    shipVectorFinal = shipVectorHeadPos - shipVectorTailPos;
        //cast distance onto this
    Echo("\nVector: " + shipVectorFinal.ToString());
    Echo("\n Projector Offset: " + projectorOffset.ToString());
    Echo("\n Rotor Offset: " + rotorOffset.ToString());

}