From Van's web site:

If you called Van's about 8:30 in the morning on May 29, and the phone rang and rang ... well, we have the best possible excuse. Most of the company was standing along the taxiway watching Van taxi the new RV-10 to runway 35. At about 8:40 the big six cylinder spooled up (quietly, with that big muffler) and the airplane was in the air in about 450 feet. Takeoff and climb out certainly looked like an RV!

See Van's RV-10 Page for more info and pictures.