Two experimental aircraft collided on the ground Saturday, at non-towered Arthur Dunn Airpark in Titusville, Fla. At about 8:30 a.m., one of the aircraft (a Velocity XL RG) landed, was attempting to land or was performing a low pass when it struck the other aircraft (an RV-8) as it taxied. Two occupants aboard the experimental Van's RV were killed. After the impact, the four-seat Velocity canard cartwheeled for roughly 300 feet before coming to rest, inverted. Witnesses came to the aid of that aircraft's two occupants, who suffered severe burns and were taken to Orlando Regional Medical Center. One of those occupants had also passed by the time of this writing. Both had suffered life-threatening injuries. Bystanders told reporters that the landing aircraft's approach seemed unusual, but many informed witnesses preferred not to comment. The airport was busy with aircraft arriving for an EAA pancake breakfast. The pilot of the Velocity may be the sole survivor.