def cm_q(cm_i, l_t, mac):
    """ This calculates the damping in pitch coefficient        

    Assumptions:
    None

    Source:
    J.H. Blakelock, "Automatic Control of Aircraft and Missiles" 
    Wiley & Sons, Inc. New York, 1991, (pg 23)

    Inputs:
    cm_i                [dimensionless]
    l_t                 [meters]
    mac                 [meters]

    Outputs:
    cm_q                [dimensionless]

    Properties Used:
    N/A           
    """
    cm_q = 2. * 1.1 * cm_i * l_t / mac 
    
    return cm_q