Mark 1
>Further downstream the exhaust will diverge at about 7 degrees.
I don't know if this would hold up for 300m, but if it did the jet would be over 30m in diameter, so about 400 times the area at source and so 1/400th the velocity.
If, hypothetically the exhaust did *NOT* diverge, what would the calculation be to determine the distance where the velocity drops to zero ? Just approximately would be interesting enough for me.
I'm guessing that the air density / viscosity would be part of the calculation and probably the friction over the ground. What if we ignore the friction over the ground ? .. is it just a question of the velociity, viscosity, density all part of some kind of formula ?
Mike