Versions Compared

Old Version 45

changes.mady.by.user Unknown User (reilleya@mit.edu)

Saved on

compared with

New Version Current

changes.mady.by.user Unknown User (reilleya@mit.edu)

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Overview

Image RemovedImage Added

Ocean Water is the team's second composite propellant. It uses higher solids loading and fewer additives than our first formula to achieve improved performance.

...

Mechanical Properties

Main article here.

Mixings

Mixing Date
Serial Numbers
Site
Result
9-29-201798-PT #1, #217-110First two 98 mm grains mixed. Improper equivalent weight calculation lead to soft cure.
11-7-201798-PT #317-110Mixing to characterize EZ-Cast. Used old mixer.
11-12-201798-PT #417-110Used old mixer. Improvements to casting process. Slightly lower solids loading
11-14-201798-PT #5-717-110First mixing with new mixer. 3 characterization grain for characterization testing.
11-22-201798-PT #8-1017-1103 grains for characterization testing. Stopped using EZ-Cast (Failed Project).
11-28-201798-PT #11, #1217-110Used finalized casting procedures
12-6-2017OW-152 #1, #217-110First 6 inch grains. Densities were consistent with the 98mm grains used for characterization.
12-8-2017OW-152 #3-517-110Next 3 6 inch grains. 2 dogbones were also cast. Results pending.
12-20-2017OW-152 #6-8, OW-98-FIN117-110The "MegaMix"
1-30-2018OW-152 #9-1217-110Grains 1-4 for the Full Scale test motor. Each grain had a 1.7" core.
2-2-2018OW-152 #13-1617-110Grains 5-8 for the Full Scale test motor. Core diameters were 1.7" (2), 1.9" (1), and 2.25" (1)
3-??-2018OW-152 #17-2017-110Grains 1-4 for 8G motor test.
4-1-2018OW-152 #21-2417-110Grains 5-8 for 8G motor test.
5-17-2018OW-152 #25-2817-110Final mix of the school year, made four grains for a flight motor.

...

Identifier
Date
Site
Result
Characterization Static Fire #1November 25, 2017Crow IslandNozzle Failure
Characterization Static Fire #2November 25, 2017Crow IslandNozzle Failure
Characterization Static Fire #3November 25, 2017Crow IslandMotor success, pressure transducer failure
Characterization Static Fire #4November 25, 2017Crow IslandMotor successSuccess
Characterization Static Fire #5December 2, 2017Crow IslandMotor Success! Highest pressure to date: 695 psi
Characterization Static Fire #6December 2, 2017Crow IslandSuccess, excellent BATES curve
OW-152-4G #1Janurary 14, 2018Crow IslandFull Duration. First Try.Success
OW-152-4G #1#2Janurary 27, 2018Crow IslandSuccess
OW-98-FIN1 #1Janurary 27, 2018Crow IslandSuccess of a very angry motor
OW-152-8G #1Feburary 24, 2018Crow IslandFull Impulse. Thrust and Pressure higher than expected. Nozzle crackedNozzle cracked, but motor still delivered expected impulse. Thrust curve was not the correct shape.
OW-152-8G #2April 7, 2018Crow Island

Failure. Liner Burnthrough at T+3.

OW-152-4G #3July 21, 2018FARSuccess. First Flight Motor.

...