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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);
