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  #21  
Old 01-30-2011, 10:38 PM
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CPMcGraw CPMcGraw is offline
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Next is the sustainer engine mount. I'm using a BT-20L tube to form a stuffer tube. The subassembly is upside-down in this photo. At the top is a third centering ring. It is not glued in place yet, as the tube needs to be glued into the 5" BT-60 first (the coupler is involved).
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  #22  
Old 01-30-2011, 10:55 PM
El Cheapo El Cheapo is offline
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Are those ply it fiber centering rings?
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  #23  
Old 01-30-2011, 11:01 PM
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Quote:
Originally Posted by El Cheapo
Are those ply it fiber centering rings?


These rings are SEMROC's AR-2060 matteboard rings, laser-cut. The rings in the booster are their AR-5060's. All of the main parts used in this build are from SEMROC. The balsa used for the fins is from Lone Star Balsa in Texas (I bulk-order balsa as I also build RC airplanes).
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  #24  
Old 01-31-2011, 12:07 AM
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The lower sustainer subassembly is coming together, with the long mount now glued into the 5" BT-60. The AR-2060 at the 'top' has a "V" notch in it for passage of the Kevlar thread, but at this point is still not glued in place.
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  #25  
Old 01-31-2011, 12:25 AM
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At this point in the build, I need to mention that I made a couple of changes in the sustainer fins, relative to what is called out in the Mk IV plan file. First, I reduced the thickness to 3/32 from 1/8". Second, I increased the root-to-tip-peak measurement by 1/16", for a maximum width of 1.188". When loaded up with one of the engines in my simulations, these two simple changes improved the stability margin from 1.14 to 1.31 without being highly noticeable. I just wasn't comfortable with such a low static margin for a model this size.

This is a large model for 18mm and 24mm engines. It's really impressive when I put the stack together and get to see the full length on my workbench. Photos are forthcoming!
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  #26  
Old 01-31-2011, 12:39 AM
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OK, I'll tease you a bit...

Here's the full stack fitted together, but not glued, and without the sustainer fins. Notice the comparison between Sentinel-B and Night SHADO...

Those are 17" monitors in the background.
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  #27  
Old 01-31-2011, 03:30 PM
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Progress so far:
  • The Kevlar thread was double-looped around the top of the stuffer tube, and the upper centering ring glued in place.
  • The upper and lower sustainer tubes have been glued together (upper centering also glued inside upper tube).
  • The screw eye was inserted into the nose cone and glued in place.
  • The sustainer fins are now being attached.

This has been a much quicker and easier build than the Night SHADO. In my mind, I'm envisioning a 2" version...
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  #28  
Old 01-31-2011, 04:36 PM
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The sustainer fins are now attached, and all that remains is:
  • Cut vent holes in the booster tube.
  • Glue the booster mount in place.
  • Attach the launch lugs to the sustainer.
  • Prime & paint.
  • Decals.
  • Parachute and harness.
  • Engines.

The last one is proving to be the most difficult...
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  #29  
Old 01-31-2011, 05:34 PM
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Some decal images for the model.
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  #30  
Old 02-08-2011, 11:32 PM
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Default Progress Report...

The booster vents have been cut, and the booster mount has been glued in place. Last step in the construction is the placement of the lugs.
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