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

• Jakob - probably should withstand 2,000 lbs of force

• https://www.mcmaster.com/u-bolts

  

older version(s):