# Moment of inertia of apollo 11 lunar module

I'm currently modeling the lunar landing in 2D.

When I set up the momentum balance: $\ddot{\theta} = \frac{dF_l}{J}$ where $d$ is the distance between the sidethruster and the center of mass. $F_l$ is the force from the side thruster and $J$ is the moment of inertia.

I don't really have a background in physics, and was wondering what a decent value for $J$ could be. At the moment it's at 100 000 and the distance is 4. But I'd like to be able to explain why I chose these values. Any input would be enormously helpful

• There is a huge command / lunar module mass properties document posted here: hq.nasa.gov/alsj/… I have not looked through it to see if it answers your question so posting as a comment. – Organic Marble Nov 2 '16 at 14:41