specialactivitieSK
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Smokeless Rocket Propellant
Hi. I Will use by Amateur Rocket a rocket motor from NcDeGDN Smokelles Propellant core with Pyro Booster tablet (BP+Mg+Nc) on the top of the
propellant against Pulsation of the core.
Who can tell me, what diameter should have the nozzle. Thx.
Video of burning of the core with different holes : https://youtu.be/XYRUxTZJN1Q
    
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XeonTheMGPony
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I hope al those leafs are very wet, you got beyond lucky as hell no forest fire started! need a much larger exclusion area!, and perhaps sand bank.
Next need to test cores in a mock motor shell, as will behave very different.
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Microtek
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You could take a look here:
http://www.thrustgear.com/topics/Kn_Notes.htm
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Fulmen
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How could we possibly know? You haven't given us anything to work with.
We're not banging rocks together here. We know how to put a man back together.
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katyushaslab
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> NcDeGDN Smokelles Propellant core
I have absolutely no idea what you mean by this. I gather it includes nitrocellulose and something else? How is it made?
As for working out optimal core geometry, you should build what is called a "load cell" and start gathering data, plotting thrust curves with the fuel
grain installed in a motor with a nozzle, etc.
Also, it looks like these are ignited from one end? For maximum thrust you want to ignite the entire core pretty much all at once.
[Edited on 11-11-2021 by katyushaslab]
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Twospoons
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You need to build a strand burner so you can run tests to work out the burn rate coefficients for your propellant. From there its just math to work
out the dimensions of your propellant grain, core geometry and nozzle.
Without those burn rate coefficients, no-one can help you.
[Edited on 11-11-2021 by Twospoons]
Helicopter: "helico" -> spiral, "pter" -> with wings
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Laboratory of Liptakov
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The only advice is your own tests of different nozzle diameters. With the same engine body design.
If come KATO, the nozzle was small....
Development of primarily - secondary substances CHP (2015) Lithex (2022) Brightelite (2023)
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Microtek
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I would guess that NcDeGDN means nitrocellulose/diethyleneglycol dinitrate. It would benefit from some oxidizer, IMO.
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