A headwind can slow runners, while they may gain wind assistance from a tailwind. This is the still-air, headwind or tailwind scenario. It was found to have good hover stability against crosswind and tailwind. Aircraft usually have maximum tailwind and crosswind components which they cannot exceed. At the moment of touchdown, the assumed crosswind turned out to be a tailwind. A tailwind increases takeoff distance required and decreases the climb gradient. Determining the ground speed of an aircraft requires the calculation of the head or tailwind. SCiB batteries are used in the Schwinn Tailwind electric bike. The aircraft landed with a tailwind, just within its limit of . A tailwind will reduce the drag and the projectile/bullet drop. This often makes ultra long range shooting in head or tailwind conditions difficult. With a maximum-allowable tailwind of , Montgomery posted a time of 9.78 seconds. Branch said that the Raiders took advantage of the tailwind after the teams switched sides. Wittman developed the C-85 powered "Flying Carpet" in 1953, later renaming it to the "Tailwind". Drivers had to cope with a tailwind between turns eight and nine.