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Sub-assemblies

  1. Motor

    •  

      5/16", 1/4" hex key

    •  Epoxy
    •  High temperature grease
    •  Gorilla glue/polyurethane (PU) glue
    •  Room temperature vulcanizer (RTV)
    •  Adjustable spanner
    •  Rubber Mallet
    •  Boattail Allen Key**

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NOTE: This page will likely be later updated so that each major sub- assembly is a separate page

Sub-assemblies

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    1. Assemble the nozzle. Add o-rings and lubricate well.
    2. Follow the 'MIT Rocket Team Grain Cutting and Bonding Procedure' to bond the grains to the liner, using the nozzle assembly as a placement guide. Apply aeropoxy to the splice, if any.
    3. Bolt the nozzle assembly to the case, taking account of directionality.
    4. Slide the motor load into the case.
    5. Use RTV to attach the insulation disk to the forward closure. 
    6. Attach the pressure transducer to the forward closure.
    7. Add o-rings to the forward closure and lubricate generously. Slide the closure into the open end of the case.
    8. Bolt the forward retention ring to the case.


  2. Piston

    Materials

     
    •  

      PIston

    •  

      1/4 in torque wrench

    •  Integrated

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    • Firebolts
    •  Multimeter
    •  Teflon tape
    •  2 1/4 NPT

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    • plugs 
    •  Safety goggles
    •  Gloves

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    •  Weigh boats 
    •  Popsicle sticks
    •  Elbow joint
    •  Tee fitting
    •  Adjustable wrench
    •  Vice grip/pliers
    •  

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    • Small scale

    Procedures

    1. Using a 1/4 inch torque wrench, ensure that the bolts holding the piston together are very very tight. If the bolts are loose, the piston will lose pressure as it extends. (torque wrench adapter in piston box)

    2. Use multimeter to check continuity of Firebolt (should be about 1.0-1.4 ohms) and twist the wires to short it. Two people should visually confirm that it is shorted. Wrap the Firebolt with five wraps of Teflon tape. Use pliers to screw firebolt into the NPT plug.

    3. Everyone put on safety glasses. From now on, everyone within the vicinity of the pyrotechnics must wear safety glasses.

    4. Measure

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    1. and pour 0.2 g of black powder into

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    1. the other side of the

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    1. plug, holding over a weigh boat to catch any fallout. Seal the opening by wrapping over the head and opening three times with Teflon tape. Make sure Teflon tape is flush on the inside.

    2. Repeat steps b-d

    3. Compress the piston completely!

    4. Screw an elbow joint into a side female end of the tee after adding Teflon tape.

    5. Wrench the elbow and tee assembly into the inlet hole of the piston with 5 wraps of Teflon tape until extremely tight and turned upright.

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Screw a 1/4 NPT plug into a female end of a 1/4 NPT tee adapter.

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Seal the open female end of the tee fitting with another plug (filled with appropriate black powder).

 

    1. Put the 2 assembled plugs into two remained female ends of tee fitting

    2. Clock the tee fitting close to the body of the piston so the piston fits better into AV bay

    3. Test the piston by pulling up rod for 5 secs and seeing it it is sealed
    4. Log Firebolts

Nosecone Tip Procedure

Procedures

    1. put bolt through washers
    2. put thermocouples through washers
    3. twist both sides of wires (wrap around bolts and thermocouples around themselves
    4. stick into NC to the end, pull themocouples through small end. Shift around to place washers flat inside
    5. put nosecone tip in
    6. stick a long arm in and twist the bolt into hole

  1. Payload - NC

    Hermes II Payload - NC Assembly Procedures

  2. AV Tower

Payload - NC

AV Tower

Assembly Procedures for the Hermes II Avionics Tower

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  2. Soft Goods

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  2. Lower Electronics

     

MP Assembly

 Materials

  •  Hard goods box (6-32 bolts, 4 1/4-28 bolts, 4 1/4-28 bolts with washers, 3 chamfered 6-32 bolts, eyenut, cotter pin, 10-32 nuts, quicklinks)
  •  Integrated piston
  •  AV tower
  •  Recovery guard
  •  Payload stack
  •  Payload bulkhead
  •  NC coupler
  •  Antirotation rod
  •  Skinny god nut
  •  Integration stands
  •  Tender descenders and loops
  •  Connecting loops (3)
  •  Black Powder
  •  Gloves
  •  Popsicle sticks and weigh boats
  •  Goggles
  •  Paper funnel
  •  Scale
  •  Hex key set
  •  Needle nose pliers
  •  Adjustable wrench
  •  Clocking tool

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Procedures

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  1. Attach AV tower to payload bulkhead with 6-32 bolts. The elbow/ tee fitting assembly must be turned slightly inward in order to fit the AV Tower on top

  2. Attach integrated piston to payload bulkhead with ¼-28 bolts

  3. Wire piston to AV tower

  4. Attach recovery guard to piston using ¼-28 bolts and washers **orientation matters will update

  5. Attach payload stack to payload bulkhead

  6. Attach nosecone coupler using 3 chamfered 6-32 bolts, attach nosecone

  7. Integrate soft goods and tender descenders **Will update with line diagram 

    1. Another QL at end of MP Riser to Motor Section Riser (wide Black) and Main Riser (Blue Spectra)

    2. Main Bag Bridles and load-bearing riser to QL to a 1500 Swivel to drogue riser

    3. Drogue riser to QL to drogue lines

    4. Connection from bottom of drogue bag to Motor Riser

    5. Other end of Motor Riser to loop to swivel to loop to eyebolt

    6. For tender descenders from Main Bag TD loops to eyebolt:

      1. Wear goggles and gloves to measure appropriate black powder using weigh boats, scale, and popsicle sticks

      2. Hold TD loops in place

      3. Use funnel to fill TD with black powder

      4. Push the two pieces of TD together

      5. Repeat with second one

  8. Tighten all quick links with a wrench

  9. Screw antirotation rod into diaphragm with locknut

  10. Attach diaphragm. Screw on skinny god nut and place diaphragm on. Next screw the eye nut on and insert cotterpin. Finally, hold the god nut with small pliers and screw the eye nut tight. Fold down and gaff tape over the spikey bits of the cotterpin!

  11. Set up integration stands. Stand piston-diaphragm assembly and cup close to each other.Thread main bag with lines and tender descenders through cup, so tender descenders are close to the diaphragm. Pull tender descender wires through half-moon shaped hole and attach tender descenders to eye nut.

  12. Push cup (with main bag, TDs and lines) onto diaphragm and secure with 10-32 grub screws

  13. Attach swivel (on motor riser) to quick link on top of main bag

  14. Quick link drogue to drogue riser


  2. MP Assembly

    Hermes II Mission Package Assembly Procedures

Integration Order

Ideally, the piston, AV tower, and payload stack can be assembled in parallel and then each attached to the payload bulkhead. In parallel to this assemblage, the nosecone and mystery box can be integrated. Then the two groups would be integrated together with the soft goods and the fin can.

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MP Assembly Pictures

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