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  MSFC 1:20 scale Apollo CSM/LEM model

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Author Topic:   MSFC 1:20 scale Apollo CSM/LEM model
Rocketman!
Member

Posts: 98
From: Redmond, Washington, USA
Registered: Dec 2007

posted 02-12-2018 02:31 PM     Click Here to See the Profile for Rocketman!   Click Here to Email Rocketman!     Edit/Delete Message   Reply w/Quote
One of my latest acquisitions is a 1:20 scale Apollo CSM/LEM model made by the Marshall Space Flight Center Graphic Engineering and Models Branch. It is an excellent model, very large and well built. It also ties back to the history of the Apollo program, and Apollo 13 in particular. A model like this one (or possibly this very model) was used during the post mission press conference for Apollo 13 held on April 21, 1970 in Houston. Jim Lovell made good use of the model while explaining how he and Fred Haise maneuvered the two joined spacecraft from the Lunar Module, as seen in this UPI photo published by Newsday.

There are two relatively minor issues with the model that I would like to remedy, and I am reaching out to the cS community for some assistance. For both of these issues, I would like to know if anyone else has a model like this one that can be used as a reference.

The first issue, which you can see in the photos above, is that my model is missing the landing footpads. I am planning on reproducing a set of replacement footpads, and with the help of Michael Key (keymichael1855) I will be attempting to design my first 3D printed parts. Hat tip to Fred Karst (GACSpaceguy) for connecting me with Michael. I would like my replacement parts to be as close to the original model's design as possible, as opposed to emulating the actual flown hardware. In other words, they would reflect some simplification and artistic license on the part of the MSFC modeler. I have found several period photos of this model, but none are clear enough or are of high enough resolution from which to get a good sense of the actual shape of the footpads or show how they had attached to the landing legs. Do any cS readers have good photos or plans, or an identical model that could be used as a reference for replacing the footpads?

The second issue is that the connection between the LEM ascent and descent stages is loose enough to produce a gap and causes the two stages to be misaligned. I cannot see a way to tighten up the gap between the stages without first fully separating them. And, therein lies the basic problem... the internal mechanism to release the stages is inoperative and I cannot separate them. The connections between all of the separable parts of the model are very well engineered, but it seems that this particular joint may have become worn out or broken. If anyone can provide photos or a schematic diagram for how the internal attach/detach mechanism works it may help me with my attempt at repair.

As a side note, the way in which this model was engineered is very impressive. Each of stage connections is built in such a way as to hide them in plain sight. To detach the CM from the Service Module, for example, the umbilical cable tunnel serves as a lever which, when pulled away from the SM, disengages an internal latch. Similarly, the LEM front hatch, when pressed, serves as the latch release to undock the ascent stage from the Command Module. The CM probe is even a good approximation to the real one. The LEM descent stage release (the one that currently doesn't work) is a button built into a raised section on the side of the octagonal structure. The MSFC model builders included a detailed photographic guide to assembly/disassembly on the bottom of the base (shown below).

All things considered, I feel very fortunate to have been able to obtain this model. It ranks among the top in my collection. I would appreciate any help that can be offered to get this model back in "flight ready" condition.

Lunokhod 2
Member

Posts: 73
From: France
Registered: Sep 2010

posted 02-13-2018 09:27 AM     Click Here to See the Profile for Lunokhod 2   Click Here to Email Lunokhod 2     Edit/Delete Message   Reply w/Quote
Since I already made the landing pads for various scales, I just uploaded on Shapeways the 1/20 version which you might be interested in.

Rocketman!
Member

Posts: 98
From: Redmond, Washington, USA
Registered: Dec 2007

posted 02-17-2018 04:13 PM     Click Here to See the Profile for Rocketman!   Click Here to Email Rocketman!     Edit/Delete Message   Reply w/Quote
Thank you, Vincent. Your footpads look like they might be close to matching the style of the rest of the LEM model. They may need only minor modifications to the leg attachments to fit.

I'd like to give this thread a while longer to see if anyone can provide clear photos of an identical model's footpads. Then I may follow up with you to see about making the modifications and having a set printed.

NASA Glenn
Member

Posts: 68
From: Cleveland OH
Registered: Feb 2007

posted 02-20-2018 10:52 AM     Click Here to See the Profile for NASA Glenn   Click Here to Email NASA Glenn     Edit/Delete Message   Reply w/Quote
NASA Glenn in Cleveland had this very model. I have forwarded some detail photos.

Rocketman!
Member

Posts: 98
From: Redmond, Washington, USA
Registered: Dec 2007

posted 02-20-2018 12:30 PM     Click Here to See the Profile for Rocketman!   Click Here to Email Rocketman!     Edit/Delete Message   Reply w/Quote
Thank you, Glenn! Those are outstanding shots. They will certainly help in the restoration. I've responded to your email with some additional questions.

Also, I now know there were at least three of these models made.

GACspaceguy
Member

Posts: 2260
From: Guyton, GA
Registered: Jan 2006

posted 02-20-2018 07:10 PM     Click Here to See the Profile for GACspaceguy   Click Here to Email GACspaceguy     Edit/Delete Message   Reply w/Quote
Can you share your new photos? Us model collectors love model pics.

Rocketman!
Member

Posts: 98
From: Redmond, Washington, USA
Registered: Dec 2007

posted 03-19-2018 05:30 PM     Click Here to See the Profile for Rocketman!   Click Here to Email Rocketman!     Edit/Delete Message   Reply w/Quote
Shared with permission from Glenn Murray (NASA Glenn) are some of the over sixty detailed photos he was so kind to provide me. According to Glenn, the model he photographed was displayed at the former visitor center at the NASA Glenn Research Center in Cleveland, Ohio, and may have since been moved to the Great Lakes Science Center when the visitor center was relocated.

Glenn recalls that the landing pads were stamped metal and attached to the legs with "some sort of solder." He went on to say that "the undersides of the pads were smooth [with] no fastener head evident."

With the new knowledge afforded by Glenn's images and description, I have a much better idea of how the original model's footpads looked. I don’t have a way to create stamped metal parts, and I would like to avoid permanently bonding the footpads to the model for preservation purposes. So, the original approach to use 3D printing suggested by Michael Key and Vincent Meens may still be the most promising way to go. How thin can stereolithography parts be made? Opinions/advice welcomed.

Glenn's photos also included some good views of the LEM ascent-to-decent stage linkage. From what I can see, the connections are identical to those of the other modules (SM-to-CM and CM-to-LEM ascent stage). The internal mechanism is still a mystery to me, but now that I can see the similarities I may be able to get some clues from the way the ascent-to-CM docking link is released by the ascent stage forward hatch button.

dsenechal
Member

Posts: 445
From:
Registered: Dec 2002

posted 03-19-2018 11:01 PM     Click Here to See the Profile for dsenechal   Click Here to Email dsenechal     Edit/Delete Message   Reply w/Quote
Here's a thought. Find a friendly machinist and have him/her make a negative and positive die. Might even check with a technical college and see if they would do it for you as a project. It's a relatively simple process made with a lathe. Then you can stamp as many footpads out of soft brass as you like with a basic hydraulic press.

It may cost a couple hundred dollars, but given your investment, I'd think you'd be happy with the outcome, and it would be similar, if not identical, to the originals. You could use a little silver solder to attach them, or JB Weld, and then paint to match the rest of the landing gear.

If you decide to go with a 3D printed version, though, I think Michael Key would do a bang-up job for you.

Retro Rocket
Member

Posts: 426
From: Santa Paula, Ca,. USA
Registered: Dec 2007

posted 03-20-2018 05:04 PM     Click Here to See the Profile for Retro Rocket   Click Here to Email Retro Rocket     Edit/Delete Message   Reply w/Quote
If things work out I'll be doing a 1/16th LM using Vincent's SW parts. I've had a few small stainless steel parts printed and they will be perfect for the hinges and other structural parts as they can have very small details and they are very cheap.

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