The report does not disclose how investigators knew that the pilot had failed to calculate the airplane's takeoff performance. (He had obtained a weather briefing, which, by the way, had suggested the possibility of some convective activity in the vicinity and might have contributed to the group seeming to be in a hurry to depart.) If he did consult the performance charts, he would have found that, even with a 200-pound overload, the airplane would be expected to leave a paved runway within 2,000 feet and to clear a 50-foot obstacle in not much more than 3,000. With 25 degrees of flap, both figures would have been reduced by about 800 feet. A grass runway offers more rolling resistance, but, despite the unexplained reference by the airplane's owners to four- to six-inch grass, the grass at Gaston's was "manicured" and about an inch tall (as is apparent from photographs of the runway in the NTSB's online docket) and would not increase these distances by more than 10 percent. Using handbook data, the NTSB investigators arrived at an expected flaps-up distance to clear a 50-foot obstacle of 3,190 feet — just about the length of the runway.