As you might imagine, it depends on the drone and the crash. We absolutely recommend you bring a cleaning kit and lots of extra propellers, but the chances of snapping off a propeller arm or destroying your frame are slim. Your race track may be made of steel and concrete, which is a recipe for disaster, while grass, dirt, and bushes are less destructive. Then there's water, water is a nightmare for most drones. Most crashes in drone racing are collisions with gates or the wall if you really miss a turn. Also frequent are mid-air collisions with other racers. These types of crashes are usually just glances that send the drone into an uncontrolled spin, no real harm is done if you can recover, it's the ground and subsequent objects that are the issue. It's almost a guarantee that you will crash your racing drone. Your first priority is to shut things down and check out the battery. Lithium batteries like to burst into flames, make sure to have sand or dirt around to extinguish any flames, do not use water! The moment you collide with something, we recommend cutting the power, it is really bad on motors to try to spin if the propellers are stuck, and broken propellers become dangerous projectiles if pieces snap off. Don't get discouraged, crashes happen, the repairs suck, but they help you improve your flight skills.