Ascent Stage Dry Mass Calculation Sheet Version 1.0

Name                      Weight  X Station  Y of CG  Z of CG
                                    of CG

                           (lb)     (ft)      (ft)     (ft)
Ascent Structure          582.00    15.00     0.00     0.00
Main Engines               68.00    17.00     0.00     0.00

  Total Fixed Mass        650.00    15.21     0.00     0.00

Moon Rocks                200.00    10.00     0.00     0.00
Astronauts                750.00    10.00     0.00     0.00

  Total Removable Mass    950.00    10.00     0.00     0.00

  Ascent Stage Total     1600.00    12.12     0.00     0.00

Release Notes:

This is the initial release of the Ascent Stage Mass Properties sheet. It has been put together to serve primarily as a seed for my spreadsheet. As such, all values contained in this sheet are to be treated as extremely preliminary. Unless otherwise noted, consider all quantities to have a very high degree of uncertainty. Please see the Ascent Stage Mass Properties Coordinate System page for a description of the coordinate system in which the Centers of Gravity and Moments of Inertia are represented.

1. Weights: The Ascent Stage has two classes of dry weight (or mass). The Fixed Mass includes things such as the structure, avionics, and engines. The engine mass is based upon using three Kaiser Marquardt R-40A engines. The rest of the mass was added to make the total agree with previously published data. The Removable Mass includes the astronauts and their spacesuits and any lunar samples to be returned to Earth, and is pretty well known. As the EVA backpacks are left on the moon, their mass is not included.

2. X CG location: The X coordinate of each component's center of gravity has been based upon a crude estimate of where the geometric center of each component will be located. The Ascent Stage total makes use of each of these locations.

3. Y and Z CG location: The Ascent Stage has been assumed to be radially symmetric. Consequently, the Y and Z coordinates of all center of gravity locations are zero.

4. Moments of Inertia: No moments of inertia have been given.

Planned enhancements to this page include:

• Increased and improved component weight definition
• Increased and improved component CG location definition
• Increased and improved component moment of inertia definition
• Addition of moments and cross products of inertia