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Old 04-08-2009, 07:04 PM
rocketguy101's Avatar
rocketguy101 rocketguy101 is offline
frustrated aero
Join Date: Sep 2006
Location: Duncan, OK
Posts: 763
Default 1/100 Saturn 1B (Centuri or Estes)

I am currently building a Centuri 1/100 Saturn V as covered in this thread -- anyway, as I sit and look at S-IV/SM/CM stack sitting there, it just screams at me "clone a Saturn 1B!!!"

Boy there isn't much to go on--I found some plans for the Centuri version on JimZ
Centuri Saturn 1B KS-10
and the Estes version on YORP
Estes 1/100 Saturn 1B #2048

Both sets of plans are a little vague about the tubes. Centuri lists nominal dimensions in the instructions, where Estes lists some part numbers (not the "BT" series). I stumbled across a great reference on YORS called "Estes Body Tube/Kit Reference v3.1". This PDF file cross references the BT style pn to the new Estes pn system, plus every kit's tubes are listed, and if the BT tube wasn't listed, a substitute pn using the tube nominal OD is listed--fantastic!!! All y'all may have already known about this, but it was a neat find for me.

Perusing both sets of plans and the BTRef document, I come up with the follow tube sizes:

<script type="text/javascript"> <!-- Tube OD Nom OD Length Close Fit Close Dia Estes(BTR) Fract (16ths) 2nd Stage Body Tube 2-5/8 2.625 7.563 BT-80 2.6 2.62 9.92 Exhaust Tube 1-3/16 1.188 8.500 T3024 (Quest) 1.18 1.16 2.56 Aft Body Tube 2-11/16 2.688 1.406 T80H-34 (BMS) 2.64 2.67 10.72 Fuel Tank Tube 11/16 0.688 8.000 ----- --- 0.705 11.28 LEM-SM Body Tube ---- BT-58 OD Nom = dimension listed in Centuri instructions OD = OD Nom in decimal format Close Fit/Dia = closest fit tube from Rocksim database Estes(BTR) = tube diameter from table in the Body Tube Reference v3.1 Fract (16ths) = the decimal portion of the BTR dimension multiplied by 16 (ex. 9.92/16 is close to 10/16 or 5/8 (.625)) //--> </script>

I have always assumed the fuel tank tubes were simply ST-7 or BT-20 tubes but using CAD confirmed they will not work.

Has anybody cloned this? The Semroc tubes for the planned Saturn V kit make it tantalizingly close to reality (at least for the S-IV/SM/CM stack).

I would love to have this sitting next to the Saturn V!

BTW, I apologize if some don't like the script code in this post, but I could not get the columns line up correctly--I tried using spaces, but they get parsed-out when I preview. I checked the FAQ, and this was the only method I saw to get unispaced text.
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David Stribling
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