It's impossible to say without reading the actual policy, but the typical exclusion is for racing, legal or illegal. Other performance driving activities are often excluded, as well, so even if you are not competitively racing you won't be covered for wrecks that occur while on the race track for high performance driver education and similar things. Insurance, particularly with enough coverage to fix broken airplanes, is also not popular amongst the people who illegally drag race at airports. Let's hope the airplane's insurance carrier is aggressive with its subrogation and drains the driver's bank accounts so he can't afford to buy enough gas for a repeat performance.