I crashed my RV-4 kit on it's third flight, "my" first flight on this kit during a take-off. I had a very experienced 30+ year instructor take it up on its maiden +1 with some difficulties. He had me make some adjustments for the sensativity (expo). Anyway, it was proven to be airworthy so I can't say anything bad about this kit. My take? It was human error that caused the crash. Anyway, the damage seemed pretty bad at first. The wing cracked in half at the root so it was a g-loaded crash with the firewall also seperating. No damage to the fuselage. After doing initial repairs and looking at the plans, I have been able to re-attach the wing halfs successfully and am working on the NEW firewall. The plane should be complete in about a week. My question is, does the RV-4 need a significant amount of speed on take off? It appears I went into a tip stall (to the left) which probably would have been recoverable if I where more experienced. I feel I had a good takeoff run and the plane lifted itself up into the air, then things got bad. During the stall, the nose pitched up (probably due to my input) and to the left. I had applied full power and was just starting to recover until I ran out of sky. Perhaps some right rudder would have helped? The aircraft impacted soft grass level on the gear. The kit has installed flaps but I did not use them on this flight. Anybody have any general recommendations or info on this plane perhaps any experiences with flight characteristics? I'm having our clubs experienced pilot take her up again but was wondering if you all had any aditional good advice.

Thanks,