-------- Original Message --------
 On January 27, 2018 3:27 AM, Tim <xxxxxx@little-possums.net> wrote:

>
> Also yes, 75 tonnes is very light.  800 dton ships in Traveller often
> have masses more like 7500 tonnes.  The main effect would be that peak
> deceleration would occur on the order of 30-40 km lower in the
> atmosphere.  That's somewhat unfortunate given that the current
> profile has the ship still moving with more than half its initial
> speed at those altitudes.  They will want a shallower angle of descent
> (or active deceleration with thrusters), lest substantial lithobraking
> occur.

With a mass of 7500000 kg (7500 metric tons) the end is a bit more tragic:

https://i.imgur.com/XrIil3K.png

Impact takes place 411.55 seconds after the deorbit impulse is applied with a velocity of 4513.93 m/s (about Mach 13). Kinetic energy is 7.64*10^13 J , ~18.26 kilotons.