Recent content by francisdrake

  1. francisdrake

    Request Artemis landers

    Short answer: Yes. Long answer: But only the lander itself, without the drop tanks. Attached is a scenario to launch the Alpaca on a FalconHeavy. Orbital node lines are aligned with the Moon on the scenario date. Proceed with a partial TLI burn until the 2nd stage runs dry, then separate the...
  2. francisdrake

    Request Artemis landers

    < This is what I get: > Yes. The Principle Moment of Inertia (PMI) are the main diagonal of the inertia tensor. Here: 2.91 ... ... around x-axis (left to right) ... 7.98 ... around y-axis (up) ... ... 8.11 around z-axis (forward) As this is probably the lander-mesh without...
  3. francisdrake

    Request Artemis landers

    Thanks guys! If the R-4D thrusters shall be used, the moments of inertia shall be reduced as well. These are the approximate values if the mesh is analyzed in Orbiter's Shipedit tool: PMI = 2.5 9 9
  4. francisdrake

    Request Artemis landers

    < newdyneticscfg1.zip > Was there a special reason why the engines were changed back from Hover to Main engines? This is a little confusing for a belly lander.
  5. francisdrake

    Request Artemis landers

    To me the new T-shaped struts look very good, much more realistic than the old bulky ones! ___ I found the RCS control to be a little sluggish. The vessel tends to over-rotate when the autopilots (prograde, retrograde) are used and 'dances' around the desired vector before settling down...
  6. francisdrake

    Request Artemis landers

    Maybe the truss should not be too flimsy. :) The hab with ~3.6 ton is hanging down from it, suspended by the force of the engines while firing. The engines will provide somewhat over half a Gee, so still ~2 tons to take into account. Could look like the ISS truss connection to the solar panels.
  7. francisdrake

    Request Artemis landers

    < But looking at images I think the side areas where the tanks is too thick > I think the struts are so thick, as the Dynetics model was made for 3D printing. This needs a minimum thickness of all parts for strength. As you say, modelling the original design will give a more tenuous...
  8. francisdrake

    Request Artemis landers

    Added an attachment point to the left side of the truss and put it on a FalconHeavy. The lander fits into the payload fairing (ok, the landings legs were poking out :) ). Onboard fuel only, no drop tanks. Had to complete the TLI burn with the landers engines. Could reach an elliptical Moon...
  9. francisdrake

    Request Artemis landers

    Some more speculations on size and mass: Came across a "human-lander.pdf" from Dynetics giving a few dimensions. The truss is there 9.4 m wide. In the current model this is 9.7 m across the struts. I think this close enough. With Dynetics the same Italian company is involved who builds the...
  10. francisdrake

    Request Artemis landers

    This is becoming a very nice addon! When I try to jettison the drop tanks, I get a CTD. I guess I am missing a cfg-file for the jettisoned tanks. May I suggest to put all meshes, cfg and scenarios into one zip-file? Thanks! :)
  11. francisdrake

    Request Artemis landers

    The propellant load stated above is for both tanks. The drop tanks run empty just before landing, when coming from a 100 km orbit.
  12. francisdrake

    Request Artemis landers

    Yes, if that is ok for you. This will also increase the width of the front hatch to 0.9 m, which is good when passing through wearing a space suit.
  13. francisdrake

    Request Artemis landers

    With the new meshes I was able to import them into my 3D modeller. Thanks! When looking at the docking port used for scaling, I think the model is a little bit too small. I used the "petal base diameter" as reference, as shown in the sketch below. It should be 1200 mm, but was 954 mm. The...
  14. francisdrake

    Request Artemis landers

    Ok, here is the next iteration on the figures. It seems the lander is smaller than I expected. On the photos of the mockup, the interior looks quite spacious, but when comparing the tanks to the hab, it does not look so big. I assumed here a hab diameter of 2.4 m. Is that correct? If the tanks...
  15. francisdrake

    Request Artemis landers

    Good question. I will try to come up with a calculation sheet over the weekend. Could you maybe give the main dimensions of the tanks from the model? Diameter and height of internal and drop tanks would be interesting.
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