We were deciding between these two options, and the design review led us to choose the forward closure option only.

*insert explaintion from design review*

IMPORTANT: do mass calculation comparison: 

original:

  • 5’6” fiberglass motor body tube, outer diameter = 6.422”, thickness = .219”
  • fiberglass coupler and switch band

new:

  • aluminum fin transition
  • aluminum retention ring

 

Contacts:

Dayna Erdmann (head struc)

Matthew Campbell (former head struc)

Ethan Sit (motor)

Andrew Reilley (motor)

Jakob Coray (recovery)


Notes from 10/27
Needs to be CAD-ed:
Fin can transition
Retention Ring
Forward closure

Ethan’s Advice:
We need a body tube, it isn’t a good idea to use the motor case as the outer layer. Idea- extend the retention ring outwards to be the same outer diameter as the motor case and slide a body tube over all of it, shear pins go through retention ring and body tube.
U-boltconnectionfromforward closure for recovery

Important!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Andrew will be sending out an email today with all new dimensions- we are now having a 6” outer diameter rocket!!

 

Questions:

  • which folders to sync with rocket team svn? (all of them)
  • how to isolate mystery box components from recovery?
  • how does alongretentionring (single part, heavy) compare to a couplerandswitchband(extra section, lighter)?

 

Parts List:

  • fin can transition

    • RE: Ellen, Diane, Paige

    • function:

      • provide smooth transition from fin can to motor case for aerodynamic considerations

      • constrain fin can in place on motor case

    • key dimension:

      • cylinder: outer diameter = 6.422”, thickness = .219”, length?

    • manufacturing:

      • aluminum?

  • forward closure

    • RE: Ellen, Diane, Paige, Elena

    • function:

      • separate motor and mystery box sections

      • anchor camera and daq and protect them from heat from motor

      • how should camera and daq be connected?

    • key dimension:

      • inner diameter of motor case = 5.484”

  • retention ring

https://wikis.mit.edu/confluence/display/RocketTeam/Hermes+Webbing+Lengths 

    • RE: Paige, Bryan, Elena

    • function:

      • connect motor case to recovery body tube

      • constrain forward closure

      • allow access to camera and daq

    • key dimension:

      • inner diameter of motor case = 5.484”

      • thickness = at least .125” for recovery

      • length = bolt circle is 4”, recovery needs 6”, rest is TBD based on switch band dimensions

      • Should be 14

  • data acquisition

    • RE: Bryan, Elena

    • function:

      • collects pressure data from motor and acceleration data

    • key dimension: TBD based on payload

  • camera

    • RE: Bryan, Elena

    • function:

      • record parachute deployment

    • key dimension:

      • 2.836” x 1.305” x 0.758”

    • possible issues:

      • field of view

      • getting tangled with recovery (thin disk shield to prevent this)

      • Very approximate drawing-- will decide on system for attachment, better method of holding the camera, etc.

  • recovery attachment

    • RE: Suzanna

    • function:

      • U-bolt (or not??) attaching parachute to forward closure

    • key dimension:

      • which U-bolt are we using? are we using a U-bolt?

      • Should we use a I bolt

    • Thoughts:

      • Torque retention on safety wire? - charlie

      • Check characterization motors in lab for hole needed for ptap on forward closure

      • Heat on forward closure melts nyon on parachute? - andrew adams

      • Daq and two cameras (both up for redundancy) - daq needs to wired to the ptap

        • They might be attached to forward closure or maybe retention ring

      • Perhaps attaching parachute to a bulkhead so the heat/force/retention ring from forward closure doesn’t interfere

      • 8 bolts go around for motor case

      • Mass saving cuts (speed holes) in bulkhead

      • Which u-bolt? http://anvileps.com/data/documents/U-Bolts.pdf

 

older version(s):


 

 

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