Inclination of SSMEs

[santy86]

just a curiosity. How many degrees of inclination must the SSMEs have such that the STS will maintain equilibrium?

I mean inclination with respect to the longitudinal axis of the Orbiter (front-aft axis)

thanks,

santy

 

[Urwumpe]

The torque-neutral position is depending on the ET propellant levels.

 

[santy86]

yes of course, it depends on Gravity Center position. that's why they have gimbaling capability.

but even when the gimbal angle is 0° (at engine ignition) the SSMEs are not aligned with the longitudinal axis as I can see in many pics like this

http://mix.msfc.nasa.gov/IMAGES/HIGH/0200213.jpg

 

[Urwumpe]

Of course not, the CoG is below the shuttle all the time until shortly before cut-off.