The word "jetpack" is really a misnomer when it comes to the device being developed by the Martin Aircraft Co. That's because the Martin Jetpack gets its lift from twin ducted fans — think of a miniature helicopter with enclosed blades. Martin Aircraft says its jetpack can fly at up to 74 kilometers per hour (46 mph) at heights of up to 3,000 feet (900 meters), for a maximum duration of between 30 and 45 minutes. Inside the helmet, a radio system will allow pilots to converse with air traffic control in the same way as pilots on planes. Martin Aircraft has a business plan to initially make jetpacks for first responders, which could be used for natural disasters, search and rescue missions, or even surf patrol. The Martin Jetpack has been approved by New Zealand's Civil Aviation Authority for experimental flights but not yet for commercial use. The authority said it's working closely with Martin Aircraft as the company develops the jetpack to ensure Martin meets all necessary safety and technical requirements.