August 12, 2013 7:45am EDT | Updated Best time to see Perseid meteor shower: now Using that statement as inspiration, self-described "tinker" John Gardi drew up a design of a system that uses air to blast cars through long tubes. Gardi's concept "is the closest I've seen anyone guess so far," Musk tweeted on July 15. (See the diagram on Gardi's Twitter page here.) Musk has shared some other news about the project lately, revealing that he probably won't have much time to develop the Hyperloop — at least not in the near future. "I have to focus on core Tesla business and SpaceX business, and that's more than enough," Musk said Tuesday, Aug. 7, during a conference call with Tesla investors, Gizmodo reported. During the call, Musk expressed hope that the worldwide community of engineers, inventors and tinkers can make something happen with the Hyperloop design he puts out there. But he didn't close off the possibility of helping out in the future. "If nothing happens for a few years, with that I mean maybe it could make sense to make the halfway path with Tesla involvement," Musk said, according to Gizmodo. "But [what] I would say is, you shouldn't be speculative." Get all the stories you need-to-know from the most powerful name in news delivered first thing every morning to your inbox Arrives