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/**
 * @file bottle_drop_params.c
 * Bottle drop parameters
 *
 * @author Dominik Juchli <juchlid@ethz.ch>
 */

#include <nuttx/config.h>
#include <systemlib/param/param.h>

/**
 * Ground drag property
 *
 * This parameter encodes the ground drag coefficient and the corresponding
 * decrease in wind speed from the plane altitude to ground altitude.
 *
 * @unit unknown
 * @min 0.001
 * @max 0.1
 * @group Payload drop
 */
PARAM_DEFINE_FLOAT(BD_GPROPERTIES, 0.03f);

/**
 * Plane turn radius
 *
 * The planes known minimal turn radius - use a higher value
 * to make the plane maneuver more distant from the actual drop
 * position. This is to ensure the wings are level during the drop.
 *
 * @unit meter
 * @min 30.0
 * @max 500.0
 * @group Payload drop
 */
PARAM_DEFINE_FLOAT(BD_TURNRADIUS, 120.0f);

/**
 * Drop precision
 *
 * If the system is closer than this distance on passing over the
 * drop position, it will release the payload. This is a safeguard
 * to prevent a drop out of the required accuracy.
 *
 * @unit meter
 * @min 1.0
 * @max 80.0
 * @group Payload drop
 */
PARAM_DEFINE_FLOAT(BD_PRECISION, 30.0f);

/**
 * Payload drag coefficient of the dropped object
 *
 * The drag coefficient (cd) is the typical drag
 * constant for air. It is in general object specific,
 * but the closest primitive shape to the actual object
 * should give good results:
 * http://en.wikipedia.org/wiki/Drag_coefficient
 *
 * @unit meter
 * @min 0.08
 * @max 1.5
 * @group Payload drop
 */
PARAM_DEFINE_FLOAT(BD_OBJ_CD, 0.1f);

/**
 * Payload mass
 *
 * A typical small toy ball:
 *   0.025 kg
 *
 * OBC water bottle:
 *   0.6 kg
 *
 * @unit kilogram
 * @min 0.001
 * @max 5.0
 * @group Payload drop
 */
PARAM_DEFINE_FLOAT(BD_OBJ_MASS, 0.6f);

/**
 * Payload front surface area
 *
 * A typical small toy ball:
 *   (0.045 * 0.045) / 4.0 * pi = 0.001590 m^2
 *
 * OBC water bottle:
 *   (0.063 * 0.063) / 4.0 * pi = 0.003117 m^2
 *
 * @unit m^2
 * @min 0.001
 * @max 0.5
 * @group Payload drop
 */
PARAM_DEFINE_FLOAT(BD_OBJ_SURFACE, 0.00311724531f);