An investigation has been conducted in the Langley 20-foot free-spinning tunnel on a 1/78 scale model of the Cornelius XFG-1 glider, a tailless design having its wings swept forward 15º. It was previously found to possess erratic spin and recovery characteristics, and tests were made to determine modifications which would lead to normal steady spins with consistently good recoveries.
The results of the investigation indicated that modifications that did not appreciably alter the basic design did not appreciably improve the spin and recovery characteristics. In this instance it appears that the sweptforward wing is the cause of unsatisfactory spin and recovery characteristics.