Their airplanes did not have sufficient power to fly over the Sierra Madre Mountains nor did they perform well in the turbulence of its passes, and missions averaged only distance from their landing fields. The planes were nearly impossible to maintain because of a lack of parts and environmental conditions (laminated wooden propellers had to be dismounted after each flight and placed in humidors to keep their glue from disintegrating), and after just 30 days service only two were left. Both were no longer flight worthy and were condemned on 22 April. Congress in a deficiency bill voted the Aviation Section an emergency appropriation of $500,000 (twice its previous budget), and although four new Curtiss N-8s were shipped to Columbus, they were rejected by Foulois after six days of flight testing. Foulois recommended condemnation of the N-8s but they were instead shipped to San Diego, modified, and ultimately used as training aircraft.