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Motor Design Requirements Room temperature curing is preferred.
A case bonded
finocyl motor with an ID of 7.5
Motor Development Scheme The following phased gate approach will be used for motor development. 6" Motor Testing and evaluation First Burn: Motor should not CATO; performance should be within 30% of predicted. Extensive analysis will be performed to determine why actual performance did align with predicted. Thrust, chamber pressure, grain geometry and erosive burn will all be evaluated. Wholesale changes will be applied to the second test burn. Process and procedures will be accurate recorded, defined, and applied. Second Burn: This should be the dialed in burn. Changes derived from the first burn will be applied. Small changes will be allowed; but performance should be very close to predicted. Pre-production Burn: Performance deviation must be within 5% of predicted. Motor must perform as predicted. Motor design will be frozen at this point. No improvements will be allowed from this point forward. Processing, and procedures will be frozen at this point. 8" Motor Testing and evaluation First Burn: All motor design elements from the 6" testing will be applied to the 8" test. Any deviation from predicted performance will be attributed to scaling, and adjustments made. Only those deviations from the 6" test will be addressed, and applied. No other changes will be allowed. Pre-flight Motor: Performance must be as predicted. Deviations from predicted, will be tolerated provided the root cause can be identified. Flight Motors: Four 8" motors will be produced duplicating all the pre-flight motor. 12" Motor Testing and evaluation All data obtained from the 8" testing will be applied to the 12" motor. The 12" motor will be produced directly from data obtained from previous burns. Propellant Several propellant formulations are currently under investigation. AlumaFlame: Is the clear front runner at this time. AlumaFlame is TeamNumb's standard propellant. Alex McLaughlin came up with it years ago. Amarillo Blue: Initial BurnSim results show this propellant to have a higher than desired burn rate. Unknown Blue: This propellant used by Dave Leininger in Locomotive Breath looks great in flight, no data is available to perform an evaluation at this time. White Lightning (clone), and Wayside White seem to have potential but more data is needed. Any clones of Warp9, Kosdon Fast, or V-Max type propellants would be awesome, but will not be considered as they are deemed to aggressive,
Current Burnsim Design Four Booster Motors 8" Q-20644 (Code Name: The Fantastic Four)
One Sustainer Motor 12" S-54100 (Code Name: Hammer of the Gods)
Burnsim data files
What is BurnSim? BurnSim is a solid rocket steady-state ballistic simulation software package for the Windows platform. In a nutshell, input your motor, nozzle and propellant characteristics and BurnSim calculates the Kn through the burn and predicts estimated chamber pressure and motor performance. Once your motor design is in BurnSim, you can tweak the parameters such as nozzle diameter or grain core diameter and instantly see how the Kn, chamber pressure, and motor thrust is affected. BurnSim will also optimize your nozzle design.
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