NASA Tournament Lab


NASA Waste Jettison Mechanism Challenge

NASA is seeking concepts for a jettison mechanism to eject non-recyclable material from a crewed spacecraft during transit to and from Mars.

This challenge is closed


This challenge is closed

Meet the Winners


“Circular economy” methods such as recycling and reuse have made significant advances (see the Waste to Base Challenge), but a limited amount of waste generated aboard a crewed spacecraft cannot be recycled. Non-recyclable waste could take up crucial space, and some waste products can pose risks to the spacecraft and crew. Effectively controlled jettison operations can mitigate risks to spacecraft and avoid creating hazards or contaminants, while protecting livable volume and increasing fuel efficiency for the spacecraft. NASA is seeking an efficient and reliable jettison concept that will keep astronauts and spacecraft safe as we venture farther into deep space on roundtrip missions to Mars.



Trash jettison operations are complex and could be risky. During the transit phases of a crewed Mars mission, there is no option for returning to Earth early, or sending up a repair team or spare parts.  This challenge is therefore complex and important for a successful crewed Mars mission. Examples of material generated during prolonged spaceflight include biological waste from astronauts, spent components, protective packaging, and damaged parts. The amount of non-recyclables produced per week during a crewed Mars mission is expected to have a volume of approximately 0.2m3 with a mass of 50kg for a crew of four. This is roughly the amount of trash that would fill a standard 55-gallon drum.

Standard 55 Gallon Drums


Purpose of the Challenge

The purpose of this challenge is to generate detailed jettison mechanism designs for ejecting non-recyclable material from a spacecraft during a crewed Mars mission. Winning design concepts may be considered for further development by NASA.


The Mission Profile

There are several different crewed mission profiles that will require jettison operations, with the longest being 3 years. Such a mission would be made up of 6-9 months in transit from Earth to Mars, around 18-24 months on or near the Martian surface, and 6-9 months for the return journey from Mars to Earth. An illustration of some of the potential mission profiles is given below but this jettison mechanism challenge refers specifically to the transit phases from Earth orbit to Mars orbit and the return. Surface operations on Mars are not included, but the solution must still be available for the return journey so consideration must be given to how the system will be stored and maintained during long surface operations. Jettisoned objects will orbit the Sun but, given the huge distances from Earth and vast volume of space, these are very unlikely to ever interfere with future space missions.


Some Potential Mars Mission Profiles

Even if technological developments allow significant improvements in recycling, reuse and repurposing, there will still be certain waste products that will need to be jettisoned. The exact composition of these will be determined by any recycling technology adopted, but could include urine salts, carbon residue, wet or dried fecal matter, waste food, used hygiene products, plastic packaging, protective foams, metals, and ceramics.


Trash Jettison Mechanism Design Criteria:

There are a number of key requirements that successful jettison mechanism solutions must deliver. These include:

  • The trash jettison mechanism, and any supporting systems, must be able to process minimum waste levels of 0.2m3 volume and 50kg per week. This will be made up largely of biological astronaut waste and packaging associated with consumables such as food, but periodically could include broken parts, worn out clothing, medical waste, packaging, and expired mission equipment.
  • The jettison mechanism must be integrated safely with the spacecraft and not interfere with other systems or activities.
  • The jettison mechanism must be simple to operate, minimize the crew time needed to operate the system, and minimize direct crew exposure to waste products.
  • The jettison mechanism must be highly reliable and robust since the mission depends on reducing spacecraft mass by offloading waste products. Designs should either prevent jams in the first place or have some technique that clears jams and blockages. Ease of repair and effective maintenance regimes will also be key as failure during the mission could be mission and life-threatening. Wherever possible, designs should use off-the-shelf components with a high Technology Readiness Level (TRL) that have already proven to be reliable, preferably within a space setting.
  • Designs must be able to operate in extremes of temperature (hot and cold) and cater for cyclical temperature swings that result from facing towards and away from the sun.
  • Additional hardware jettisoned with the trash (for example a container, fly-away piece, or wrapper to enclose the waste) must be minimized. The preference is for no additional hardware. Trash bags such as those already used by NASA are reasonable to assume. ​
Examples of NASA Trash Bags


  • The waste earmarked for jettison will not be suitable for recycling or reuse but, if necessary, can be processed to make storage and jettison easier or safer. For example, waste could be shredded, compacted, or crushed; however, if pre-jettison processing steps such as this are proposed, details should be included in the design.
  • The power budget available on the spacecraft for trash jettison is a maximum of 500W. Pre-jettison processing techniques must also operate within this 500W power budget while also ensuring crew and ship safety. Besides staying below this maximum power, designs should strive to reduce energy consumption as much as possible.
  • The jettison mechanism must eject the trash with sufficient velocity to clear the spacecraft so as to avoid the possibility of collision. If a variable or high energy jettison system is proposed, a strategy for handling the reaction force on the spacecraft must also be presented.
  • The preferred exit route for trash is either the small scientific/utility airlock or the larger crew EVA airlock that will both be fitted to the spacecraft. The final designs of the two airlocks have yet to be finalized, but for planning purposes the HAL Scientific and Orbiter EVA airlocks described below should be used as a guide. Technical specs for these airlocks can be found at the Resources Tab but key dimensions are given in the table below. Please note that while some design changes to the two airlocks can be considered as part of submissions, wholescale redesigns that markedly change the dimensions, shape, or function of the airlocks are not feasible.
Airlock Parameter:HAL Scientific AirlockOrbiter EVA Airlock
Interior Volume0.159m35.097m3
Interior Dimensions

Approximately cylindrical with:

Length - 0.610m

Diameter - 0.610m.

Approximately cylindrical with:

Height - 2.108m

Diameter - 1.6m

Hatch Size and Dimensions

Width - 0.528m

Height - 0.629m

Thickness - 0.0218m

Approximately circular with:

Diameter - 1.105m

Hatches connect to airlock walls, not endplates.

Mounting Plate

Width - 0.660m

Height - 0.865m

Mass 374.2kg when empty.

Typical Dimensions of a Scientific/Utility Airlock and an EVA Airlock


The HAL Scientific Airlock
The Orbiter EVA Airlock
  • The decision has yet to be made on whether to have the jettison mechanism as a ‘primary’ system permanently fitted for continual use or as a ‘secondary’ backup system that is only fitted if required. Solvers are free to consider one or both options, but other airlock operations should not be constrained by the jettison mechanism when it is not being used.
  • The final design of the spacecraft has not yet been determined, but the mass and volume allowance for any part of the system within the spacecraft must be practicable given the tight mass and volume limitations of crewed missions. The preference is for compact solutions. However, the jettison mechanism and trash to be ejected must fit in either the EVA or scientific/utility airlock, so these should be taken as the upper limits when considering volume.
  • Any designs that do not use the specified air locks must explain clearly how trash from inside the spacecraft will be moved to the exterior and jettisoned without causing hull integrity or safety issues.

Other Jettison Considerations:

  • Typical dimensions of trash bags and fecal waste containers can be found in the Resources tab. The jettison system must be able to accommodate these shapes, and ideally all irregular shapes.
  • Jettisoning of material will be required throughout the transit phases of the mission. Depending on the location of the spacecraft, the jettison activity will face different challenges. A single jettison concept must be able to deal with multiple scenarios and mission waste streams. See the Resources Tab for some current policy documentation and discussion on potential future space waste regulations.
  • Material cannot be simply dumped overboard without considering the potential future impact of jettisoned waste. Where possible, jettison mechanism designs should incorporate features for reducing the risk of space debris and the biological contamination of Mars.

Challenge Breakthrough

This is a tough challenge focused on delivery of a detailed technical concept, so the prize purse reflects this. While a prototype jettison mechanism is not required at this stage, submissions must have enough technical detail to show how the concept works and how it will integrate with a crewed platform. Winning submissions are likely to include detailed technical drawings and/or blueprints as a minimum. Some suggested information requirements are listed in the table at the Resource Tab. However, the minimum information required is given below:


Minimum Submission Information Requirements

As a minimum, submissions must include:

  • Mass estimate of the jettison mechanism and any supporting systems such as a shredder or crusher.
  • Mass estimate of any wrapper or extra bag or piece ejected with the trash, and the total wrapper/bag mass requirement for the entire mission.
  • Dimensions and volume of the jettison mechanism and any supporting systems.
  • Construction materials.
  • Power requirements.
  • Detailed description of the jettison mechanism and how it works.
  • Mechanism mounting/fitting instructions.
  • Stowage plan for when the trash jettison mechanism and any supporting systems are not in use.
  • A narrative on how the jettison mechanism will support the mission.
  • A description on how to use the jettison mechanism.


Additional Submission Information Requirements

The best submissions are also likely to include information such as:

  • Technology Readiness Level (TRL) of sub-components.
  • Reliability data and/or estimates for the jettison mechanism and sub-components.
  • Maintenance and repair schedules.
  • Operating temperature ranges.
  • Prototype cost estimates.
  • Crew interaction/interface and training requirements.
  • Detailed description on how designs will be integrated with the spacecraft.


Design variations and options based on a core concept can be included in a single submission, but separate submissions should be used where solvers wish to present radically different options.


Prizes and Incentives

There is a total of $30,000 available in cash prizes and the potential to work and collaborate with NASA. The top five shortlisted submissions will be invited to pitch their design online to a NASA panel in a 10-minute presentation followed by a 20-minute Q&A session. The three finalists will be given the opportunity to attend a virtual workshop with NASA to explore their concepts in more detail. Exceptional entries may be selected for further collaboration with the NASA team.



Winners Award


Open to submissions         01 Feb 2022

Submission deadline         12 Apr 2022 @ 5pm ET

Judging Complete               07 Jun 2022

Winners Announced          14 Jun 2022


How do I win?

To be eligible for an award, your proposal must, at minimum:

  • Satisfy the Judging Scorecard requirements
  • Thoughtfully address the Submission Form questions
  • Be scored higher than your competitors!


Judging Criteria

Section DescriptionOverall Weight
Feasibility and Implementation of concept.

The judges will score submissions on feasibility and implementation plans. While radical new concepts are encouraged, entries should be supported by clear evidence for why the proposal will work. The design must also be integrated effectively with the spacecraft and crew. Judges will be looking for a sound implementation plan that displays knowledge of relevant spacecraft systems and mission risks. Judges will also consider factors such as:

  • Whether all design criteria have been met.
  • Technical maturity.
  • Compatibility with airlocks.
  • Ease of use.
  • Impact on spacecraft layout, crew and day-to-day operations.
Reliability and robustness of design.The jettison mechanism must operate trouble-free for up to 3 years in extreme hot and cold temperatures and despite the potential presence of residual waste liquids and solids from previous ejections. Submissions should present reliability data or other evidence in support of this. Judges will award scores accordingly. Designs that also include ease of repair and maintenance as a feature will be considered favorably. Simple and robust designs will also be attractive to judges.20
Safety of jettison operations in all transit phases of the crewed mission.Waste will be generated continuously during the mission. The jettison mechanism must be safe not only during jettison operations but also during pre- and post-jettison periods. The judges will therefore assess whether designs can process and jettison trash safely and effectively throughout the transit to and from Mars. The jettisoned materials should not create a hazard for the spacecraft or future missions headed to or from Mars.20


Official Rules

Participation Eligibility:

The Prize is open to anyone age 18 or older participating as an individual or as a team. Individual competitors and teams may originate from any country, as long as United States federal sanctions do not prohibit participation (see: If you are a NASA employee, a Government contractor, or employed by a Government Contractor, your participation in this challenge may be restricted.

If a legal minor wishes to participate, they must have a parent/guardian/instructor sign up for the challenge, submit the entry, and potentially receive the award on the minor’s behalf. 

Submissions must originate from either the U.S. or a designated country (see definition of designated country at, OR have been substantially transformed in the US or designated country prior to prototype delivery pursuant to FAR 25.403(c). 

Submissions must be made in English. All challenge-related communication will be in English.

You are required to ensure that all releases or transfers of technical data to non-US persons comply with International Traffic in Arms Regulation (ITAR), 22 C.F.R. §§ 120.1 to 130.17. 

No specific qualifications or expertise are required. Prize organizers encourage outside individuals and non-expert teams to compete and propose new solutions. 

To be eligible to compete, you must comply with all the terms of the challenge as defined in the Challenge-Specific Agreement.

Registration and Submissions:

Submissions must be made online, via upload to the website, before 5pm ET, on the 12th of April 2022. No late submissions will be accepted.

This challenge allows multiple submissions per individual/team. Should you have multiple entries to submit to this challenge, they will be considered separately. Whether or not multiple entries from the same individual or team may be chosen for a prize is up to the discretion of the Challenge Sponsor. You are not required to submit multiple entries if that option is available.

Intellectual Property Rights:

As detailed in the Challenge-Specific Agreement – If Challenge Sponsor notifies Innovator that Submission is eligible for a Prize, Innovator will be considered qualified as a finalist (“Finalist”). To receive a Prize, Finalist must agree to grant The United States Government a nonexclusive, non-transferable, irrevocable, paid-up license to practice, or have practiced for or on its behalf, the subject invention throughout the world in accordance to FAR 52.227-11. Notwithstanding granting the Challenge Sponsor such license for any Intellectual Property demonstrated by the Submission, Finalist retains title (e.g., ownership) of such Intellectual Property.

Selection of Winners:

Based on the winning criteria, prizes will be awarded as per the Judging Criteria section above. In the case of a tie, the winner(s) will be selected based on further deliberation by the judges.

If there are less than three submissions that meet the Judging Criteria, the sponsor may decide to redistribute the non-awarded lower-level prizes to give higher amounts to the winners.

In the event that none of the submissions meet the Judging Criteria, the sponsor will award the following consolation prizes to the competitors that score the highest:

  • Consolation Prize 1: $1500.
  • Consolation Prize 2: $1000.

Awarding of the Prize:

The Individual Submitter or Team Captain is automatically designated as the Recipient of the prize monies. The Individual’s or Captain’s name must also match the Authorized Person on the receiving Bank Account. No changes are permitted to the prize Recipient after the Submission Deadline date. If you wish to change who would receive the prize monies, those changes must be completed prior to the Submission Deadline. View our Knowledge Base article here for how to change Team Captains.

Judging Panel:

The determination of the winners will be made by a group of judges selected by NASA, including subject matter experts both internal and external to NASA.


Additional Information

  • By participating in the challenge, each competitor agrees to adhere to the HeroX Intellectual Integrity Policy and promises to submit only their original idea. Any indication of "copying" amongst competitors is grounds for disqualification.
  • All applications will go through a process of due diligence; any application found to be misrepresentative, plagiarized, or presenting an idea that is not their own will be automatically disqualified.
  • All ineligible applicants will be automatically removed from the competition with no recourse or reimbursement.
  • No purchase or payment of any kind is necessary to enter or win the competition.
  • Void wherever restricted or prohibited by law.

Challenge Updates

In case you missed it....

June 24, 2022, 3:01 p.m. PDT by Despina Maliaka

Hi all,

If you were unable to attend yesterday's winners' webinar, it is now available for you to watch using the link below. Enjoy!

Meet the winners! Register for the Live Webinar.

June 20, 2022, 9:30 a.m. PDT by Shane Jenkins

Hi there Innovators! We are so excited to share the stories behind the winners of the NASA Waste Jettison Mechanism Challenge. Join us for a live discussion starting on Thursday June 23rd at 4pm ET. Your question could be answered by our talented winners or one of the challenge sponsors!


To register for this exciting experience, save your seat by clicking this link.

Announcing the NASA Waste Jettison Mechanism Challenge Winners

June 14, 2022, 11 a.m. PDT by Shane Jenkins

NASA has selected the following winners to share in the $30,000 of the NASA Waste Jettison Mechanism Challenge. Additionally, two more winners from the pool of 5 finalists have each been awarded $1,000 and named as a tie for 4th place, making the final prize purse $32,000. The winners are:

1st Place - $15,000

Tossed In Space: Scissor-Spring-Shot by Jason McCallister

2nd Place - $10,000

Simple solutions top complexity for simple tasks by Craig Payne

3rd Place - $5,000

(S-VEL Series) Secure Variable Energy Launcher by team The Hyper Group, consisting of Miko de Meijer, Ross Palatan and Bens Abraham.

4th Place (tied) - $1,000

CO2 Trash Launcher (CO2TL) "Cotl" by Jeff Morse

4th Place (tied) - $1,000

SLEM (Spring Loaded Ejection Mechanism) by team Aggie Aeros, consisting of Krishnan Vellore, Marcus Facundo, Abby Rajagopal, Harsheet Kumm, Jaeson Rivera, Nicholas DeVault, Om Waghela, Carol Geng, Aadarsh Sudanagunta, Tsung Hsiang Lin (Sean), Akshay Kokkula, Garrett Stevenson, Aniket Pal, and Victoria Chen


We would also like to recognize the following honorable mentions. While these teams will not be receiving a monetary prize, we would like to commend them for their excellent submissions:

  • General Purpose Linear Catapult (GPLC) by Joshua Mashewske
  • Things Thrower by Dmitrii Garin
  • Sling Sled by Robert Schlecht

For those who competitors were named as a challenge winner or honorable mention, please keep an eye on your email and HeroX inboxes as a HeroX representative will be reaching out to coordinate the necessary next steps. 

For all of those who participated, thank you for your time and inspiration. You have helped our team to progress our understanding of what is possible and we hope you bring your talent to more problems yet to come.

In the meantime, stick around over the next few days for some additional news related to the challenge that may just intrigue you

Let us all say “Congratulations” once again to our winners!

Thank You for your Submissions

April 12, 2022, 2:15 p.m. PDT by Shane Jenkins

Just like that, it’s over! Thank you to all of you who sent in submissions. We can’t wait to finally see what you’ve been working so hard on. 

Crowdsourcing would be nothing without the crowd — that’s you! Thank you for being an indispensable part of this process, and using your brainpower for the greater good.

Congratulations on completing your submission. This is not an easy process, and you deserve a pat on the back for your hard work and dedication. Thank you!

Eight Hours Left

April 12, 2022, 6 a.m. PDT by Shane Jenkins

You now have eight hours left to submit your NASA Waste Jettison Mechanism Challenge. Now’s the time to make final changes and send it off!

Please remember that the deadline is April 12, 2022 5:00pm Eastern Time (New York/USA). We don’t accept any late submissions, so do your best to get it in ahead of time.

We can’t wait to see what you’ve come up with! Best of luck.

Meet the Winners

Meet the Winners

We are pleased to share the winners of the NASA Waste Jettison Mechanism Challenge. You can learn about all of the teams participating below. 

1st Place

Tossed In Space: Scissor-Spring-Shot by Jason McCallister

The Scissor-Spring-Shot jettisons using potential energy from constant-force springs loaded by scissor jacks powered by a DC motor. The mechanism promotes safety, ease of use, and has the potential to be modified to accommodate different needs.


2nd Place

Simple solutions top complexity for simple tasks by Craig Payne

The HAL airlock resembles a section of pipeline, "Pigs" are used to clean pipes and so can a Pig launch waste into space. The Pig proposed for jettison purposed consists of a stationary, locking plate and a sliding ‘piston” shaped to fit inside the airlock behind the waste load, sliding on guides that have hard stops on the exit side. This mechanism hopes to maximize the usable volume within the airlock.


3rd Place

(S-VEL Series) Secure Variable Energy Launcher by team The Hyper Group, consisting of Miko de Meijer, Ross Palatan and Bens Abraham.

The S-VEL Series (Secure Variable Energy Launcher) is a multipurpose spring-powered launcher capable of launching objects of different size, mass and shape. The mechanism is engineered to accommodate virtually all kinds of shapes given that the projectile fits within the center of the launcher and it is also designed to enable easy deployment and stowing.


4th Place (tied)

CO2 Trash Launcher (CO2TL) "Cotl" by Jeff Morse

One of the byproducts of manned space exploration is CO2. The CO2 Trash Launcher (CO2TL)  proposes using this compressed gas for a controlled ejection mechanism. The mechanism would function as a piston-type cylinder, extending to jettison waste and retracting to return to a standby state, all controlled from within the spacecraft.


4th Place (tied)

SLEM (Spring Loaded Ejection Mechanism) by team Aggie Aeros, consisting of Krishnan Vellore, Marcus Facundo, Abby Rajagopal, Harsheet Kumm, Jaeson Rivera, Nicholas DeVault, Om Waghela, Carol Geng, Aadarsh Sudanagunta, Tsung Hsiang Lin (Sean), Akshay Kokkula, Garrett Stevenson, Aniket Pal, and Victoria Chen

The SLEM is a spring-powered, robust waste jettison device capable of handling both irregular waste bags and fecal containers. The mechanism is designed around having a high TRL in order to ensure that the device is both robust and reliable. The device was based around springs intentionally to ensure that the primary mechanism behind the device was a proven and robust technology. A major factor taken into consideration was the importance of a low-risk mechanism to the astronauts and the need for a lightweight payload mechanism to minimize potential costs.