Rocket Team Meeting
November 18, 2013
Level 1 Certification
- Launch went well!
- Version 2 fins worked a lot better; version 1 fins still wobbled
- We got a Level 2 certified!
Orbital Sciences Sponsorship
- Interested in advising/mentoring sponsorship role
- During IAP, offered to send group of senior engineers to talk through design with us à good time to get feedback on our engineering design from professionals and to meet people à contacts!
- Ian wants us to send updated schedule for Pyralis à what time useful for Orbital people to come
- Send technical documentation about what we’re doing so far à know which people would be most useful to send
- Comments on how much to share à Eric: shouldn’t share code, only results of cold
- Mark everything appropriately (everything is MIT Rocket Team)
- Only include what you want to eventually be published (don’t give raw data, give processed results)
- Send funding packet with technical documents à help with funding!
Sensors & Instrumentation
- Picked up pressure transducers
- Use a load cell to measure strain gauge
- Need a mounting/cage engine thing
- Need someone who can CAD the engine mount – Julia? Eric help show SolidWorks?
- Using smooth rods instead of threaded rods because the rocket still needs to “slide” à all the force transferred to load cell
- Tube casing over threaded rods? Pinning the rods?
- Using uni-strut
- Fully designed the cooling system
- Might need a pump to pump all the water back in?
- Starting once we have measurements and final CADs down
- Eric – propulsion code from Talaris is working & can use their hardware (for a couple months…) à stuff for cold flow should be set
- Something that we might need to get back soon is regulator for nitrous
- SSL has spare tank; will look around Draper for spare parts
- Working on obtaining gases – Connie = check for ECAT
- Got the mirror – tried it out last week with pictures of pressure gradients, etc
- Photographs should have been able to photograph a higher area à problem with mirror? Need to get into Edgerton to test their mirror if we want to order a more precise mirror
- Pressure-sensitive paint ongoing
Engine Geometry & Design
- Pressure-fed cycle à no turbo-pumps to get propellants into engine
- Problem with original design is need extreme amounts of power to keep boiling to maintain pressure system
- Bottle of inert gas (~4000 psi) + regulator (~600 psi) and inert gas pushes fuel and oxidizer down into engine
- Including check valves to prevent fuel and oxidizer to prevent from mixing à need to make own pressure vessels again
- Inert gas tank ~1 kg
- Build own pressure vessels à trade off safety for weight?
- Need to worry about materials certification – make sure metal that we get has been certified and tested for material properties
- Ethane and nitrous oxide super miscible à not just a tame explosion (potential to mix for a while)
- Should read 2 NASA documents – Glass-Fiber Pressure Vessel Reinforcement Guide & another Pressure Vessel Reinforcement paper…
- Don’t need these tanks for cold flow – will be using tanks from Airgas – but need trade-off over IAP if we should build this
- Nitrous oxide is picky à we should be careful
- Talk to Orbital?
- We have a castable ceramic for insulator!
- Was originally being designed for gases
- Solid igniter? Want it to be repeatable