I built a SPAD Canard about 4 years ago and had maybe 500 flights with it, including one mid-air and 3-4 bad crashes. The engine never came off. I recently redesigned it to have a swept wing. You can see it at http://www.rcuniverse.com/forum/m_7388836/tm.htm . Even though it has landed up-side-down once and did a cart wheel another time, I have made no repairs to it yet, other than some bent pushrods. The photos were made after these crashes.