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  #1  
Old 12-31-2015, 04:46 PM
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Default Repairable Mars Lander Modification

In one of my previous threads I mentioned a possible thread on building a Mars Lander with serviceable "guts".

I have a Semroc Mars Lander of which I've completed the major sub-assemblies. I'm basing the modification on the ML procedural by Kenneth Jarosch's in the May/June 2008 issue of Sport Rocketry, but I'll probably be adding some of my own techniques. TBC
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Old 12-31-2015, 05:08 PM
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I did a repairable build several years ago. I'll see if I can find the thread.

Found it.

http://forums.rocketshoppe.com/show...ght=mars+lander



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Old 12-31-2015, 05:17 PM
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BTW, Martin Marietta is no more. Are you going to go with custom Lockheed Martin decals?

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Old 12-31-2015, 08:28 PM
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Excellent! I was wondering how to do the bottom shroud. Now I know--if you don't mind me using your idea.
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Old 12-31-2015, 08:36 PM
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Quote:
Originally Posted by jeffyjeep
Excellent! I was wondering how to do the bottom shroud. Now I know--if you don't mind me using your idea.

Absolutely! Use it and improve on it.
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  #6  
Old 01-01-2016, 12:51 PM
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Great thread! Now I gotta dig my ML, finish it and fly it.
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Old 01-01-2016, 03:56 PM
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I recall the thread now that it has been linked and I read it again. This time I bookmarked it for my next Mars Lander build.
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  #8  
Old 01-01-2016, 09:05 PM
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Alignment will be important in this model, so I've penciled witness marks onto the bottom disk and the body tube.

I then make pencil marks on the bottom disk to mark the outer edges of the landing gear housings, transfer the marks up the sides of the base, and into the edge of the base cavity.

I then slit a 1/2" wide strip of 3/16" thick basswood ("The Vixen" was able to get the bleeding stopped) and scrape a slight convex profile into one side of it with the Corian slab sovered with 220.

To help prevent the 3/16" basswood from splitting during it's end use, I slit a strip of .040" styrene and glue it onto the flat surface of the basswood strip with thick CA and clap it in place with clothespins. I use CA VERY rarely in rocket construction. I'm using it in this case only because of the dissimilar materials.

TBC
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  #9  
Old 01-02-2016, 12:10 AM
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Now to use the plastic-backed basswood.

Using a piece of 1/2" angle aluminum as a fence, I cut the strip into (8) 1/2" blocks with a razor saw.

I then use the Corian sanding slab to make the bottom end very flat and I then scrape a bevel into the bottom edge to clear the fillet inside base ring.

Using mid-cure epoxy (15 minute) I mount the (8) blocks using the pencil lines as guides.

Time for a Scotch and an IPA. Good night. TBC
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Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

NAR# 94042
SAM# 0078
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  #10  
Old 01-02-2016, 10:58 AM
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Now for some fitting.

After fitting the ascent assembly to the BT100 and center the LL through the passages I pencil a witness mark for alignment.

I then epoxy the ascent shroud assembly to the BT100 from the inside. TBC
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4 out of 3 people struggle with math.

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SAM# 0078
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