Question. I have been working on getting a motor with 4 bates grains with the outside inhibited. Is there an advantage to doing it this way other than increasing burn time? Would it be better if I simply had 4 fully uninhibited grains with a core through the center and just had a larger nozzle? I know that it would be a very short burn but wouldnt it have more thrust?
Inhibited vs uninhibited pros and cons?
Posted 08 October 2018 - 04:00 AM
An inhibitor sleve doesn't need to be thick unless it is a very large motor with extended burn time.
Posted 10 October 2018 - 01:36 AM
With four fully uninhibited cored grains, I imagine you would get immense initial thrust then it would fade out.
You would need to have a casing that could handle that sort of pressure. You would have something that resembled more of a missile than a rocket.
I just start the conversation - someone else has to question them.
Posted 15 October 2018 - 03:36 PM
I experienced nozzle clogging and subsequent CATO with uninhibited grains. Not every time, mind you but often enough to abandon the research. I used to have a few AeroTech casings that I used my own grains and scratch built graphite nozzles in, I think that is where I would go if I were to do it again.
For pyro, I would make my own paper casings, press in a clay nozzle, make r-candy then shred it to small pieces, add an increment and press just like a BP motor.
I think I would use a skinny spindle with a a bell shaped nozzle, as close to a de Laval nozzle shape as possible. Yes, I understand that the shape will only apply maximum thrust for a short while but it will not decrease the raw thrust before or after the delta is formed.
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