3 ms·
Not as much as you'd think - by design, JP7 has a low vapor pressure and doesn't ignite easily. To start the engines in the SR71, they used the very pyrophoric
by meepmorp 4y ago
Not as much as you'd think - by design, JP7 has a low vapor pressure and doesn't ignite easily. To start the engines in the SR71, they used the very pyrophoric triethylborane (spontaneously combusts at -20C).
- sbradford26 4y agoFun fact the SR71 was capable of in air refueling but it still required pyrophoric triethylborane to start afterburners which couldn't be resupplied in air. So total mission time was limited by that and not fuel.