The average length of the reproductive cycle for females is 2â4 weeks. Females reach sexual maturity (puberty) between 8 and 18 months of age. There is a tremendous variability in the maturation age between breeds, and even within a breed of dog. The first stage of the reproductive cycle is proestrus, in which eggs in the ovaries begin to mature and estrogen levels begin to rise.
It usually takes a head-on impact into something fairly solid at 30mph or more to trigger a frontal airbag. A car could be involved in a roll-over crash at 100mph or more, where it could flip over several times, and if there was no significant single front impact detected, the airbags wouldn't trigger.
The ejection gun will pull between 12 and 15g on the pilot for about 0.15 seconds as they clear the tailfin. Then the rocket pack kicks in. At that point a small 1.5 metre (5 ft) drogue parachute is fired from a gun, stabilising the seat motion. If the ejection is at, say, 40,000 ft, the air is too thin for the chute to inflate - and it would risk tangling.