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diff --git a/ao-tools/ao-fakeflight/ao-fakeflight.h b/ao-tools/ao-fakeflight/ao-fakeflight.h
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+/*
+ * Copyright © 2014 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_FAKEFLIGHT_H_
+#define _AO_FAKEFLIGHT_H_
+
+#define __xdata
+#include <stdint.h>
+#include <ao_ms5607.h>
+#include <math.h>
+#include <stdio.h>
+#include "cc.h"
+
+#define GAS_CONSTANT		287.05
+#define STEP			0.01
+#define GRAVITATIONAL_CONSTANT	6.67384e-11
+#define GRAVITY			9.807
+#define EARTH_MASS		5.9726e24
+#define EARTH_RADIUS		6375313
+
+enum flight_state {
+	state_ascent,
+	state_drogue,
+	state_main,
+	state_landed,
+	state_num
+};
+
+extern char *state_name[];
+
+struct model {
+	double	cd;
+	double	diameter;
+};
+
+struct motor {
+	double	fuel_mass;
+	double	average_thrust;
+	double	burn_time;
+	double	delay;
+};
+
+#define MAX_MOTORS	12
+
+struct rocket {
+	struct model	models[state_num];
+	double		empty_mass;
+	double		main_deploy;
+	struct motor	motors[MAX_MOTORS];
+};
+
+/* Flight state */
+
+struct flight {
+	double	time;
+	double	altitude;
+	double	speed;
+	double	accel;
+	enum flight_state	state;
+};
+
+/* ao-physics.c */
+
+/* Density of dry air in kg/m³ for a given pressure and temperature. */
+/* Density of dry air in kg/m³ for a given pressure and temperature. */
+double
+density_air(double pressure,		/* Pa */
+	    double temperature);	/* °C */
+
+/* Area of a circle */
+double
+area_circle(double diameter);
+
+/* Force due to drag (N) */
+double
+force_drag(double	speed,		/* m/s */
+	   double	rho,		/* kg/m³ */
+	   double	cd,		/* unitless */
+	   double	area);		/* m² */
+
+/* Force due to gravity (N) */
+double
+force_gravity(double	mass,		/* kg */
+	      double   	altitude);	/* m */
+
+/* ao-rocket.c */
+
+/* Mass (kg) of the airframe */
+double
+rocket_mass(struct flight *f, struct rocket *r);
+
+/* Force (N) due to thrust */
+double
+rocket_thrust(struct flight *f, struct rocket *r);
+
+/* Drag (N) due to air resistance */
+double
+rocket_drag(struct flight *f, struct rocket *r);
+
+/* Force (N) due to gravity */
+double
+rocket_gravity(struct flight *f, struct rocket *r);
+
+/* ao-fake-convert.c */
+void
+ao_ms5607_unconvert(double altitude,
+		    struct ao_ms5607_sample *ret);
+
+int16_t
+ao_accel_unconvert(double accel);
+
+void
+ao_show_header(FILE *f, struct rocket *r);
+
+/* ao-fake-log.c */
+
+void
+ao_log_flight(FILE *file, struct flight *f, struct rocket *r);
+
+void
+ao_log_sensor(FILE *file, struct flight *f, struct rocket *r);
+
+void
+ao_log_state(FILE *file, struct flight *f, struct rocket *r);
+
+#endif