Whilst taking off from a farm strip, the pilot believed the aircraft would collide with a van moving along a road that bounded the strip, and climbed the aircraft at a low speed soon after getting airborne. The aircraft’s right wing dropped, struck the van and detached from the aircraft. The aircraft came to rest in a field on the other side of the road. There were no injuries.
The pilot used ground roll performance data to calculate the takeoff distance required (TODR), and determined that the distance available was sufficient. Using information about the total distance to clear a 50 ft obstacle would have indicated that the available distance was inadequate.