• Doing it in the blast chamber:

• Eliminates trip, allows for smaller motors

• Problem: Blast chamber is bad at clearing out smoke

• Problems: super small (below ⅛”) exit diameters

• Measure pressure using a transducer

• Measure combustion temp using a thermal camera

• End burner design:

•  Way simpler for burn rate calcs

• Exponential function of burn rate and burn rate coefficient

• Easy to mix and cast in bulk with no mandrel

• Can do in excess of 8 points

• Challenge: Combustion is not in the whole tube, meaning a pressure transducer relief valve needs to be in the side

• Fear of overpressurizing the motor

• Tap for the ignition system as well

• Convergent section only meaning we aren’t optimized for thrust (no data)

• Hardware calculations:

• Design for 3000 psi yield

• Doing hand-calcs yields a mucho thick tube of 1.5” Id and 2” OD

• No need for flathead countersink screws now using 10-32 socket heads

• Throat sizing: smaller than ⅛ “ to choke flow, super sensitive

• Going from 200-1200

• Using openmotor, a diameter of 0.07” for angry goat causes a pressure build of up to 4000psi

• Test stand design - Aimee

• Separate the hardware into multiple levels of steel plates, fastened together with threaded steel rods (½”) 

• Lip thickness based on doubling motor thickness?

• Prevents heavy rotating because of the heavy rings keeping it in place.

• Pros: Easy to interchange motors, durable

• Cons: Lots of steel, concerns about it falling (tipping over). As long as it isn’t too asymmetric it’ll be fine

• Questions: It doesn’t seem reasonable to have that small of a nozzle, consider a series of opens to accelerate your flow. - Andrew K

• We may increase the size of our hardware or increase diameter for larger burn area - Justin

• Question: A lot of changes not to go to crow is unnecessary. The weather is good now and there aren’t many cons - Sam A.

• Graphite grains are larger, so drilling small holes in it may be impractical. -Andrew R.

• Very nonstandard geometry, you’re introducing lots of complexities - Sam

• This hardware wasn’t designed for the blast chamber, we could do some endburners in the blast chamber and do high pressure tests at crow island - Justin

• Question: Some effects aren’t size-independent, you should test in a bigger motor. Do a traditional bates design. Also an endburner will burn very slow - Andrew R.

• Make a 1000 psi motor at around an inch if you need to - Andrew

• Endburners aren’t easier to calculate because of temperature nonuniformities. If you can’t simulate that you won’t get good results. - Sam A

• Question: Get rid of these nuts? - AK

What needs to be in tension, what needs to be in compression?