No way nozzle-less works with sugar fuel?
I just made an instructional video for making sugar fuel in the microwave (but its too long so I think I'll just take pictures and make a new thread), I might test this...
anyone have info on Nozzle-Less rockets?
Moderator: Mike Everman
Burn test video of my recristallized ( http://www.jamesyawn.com/ ) sugar propellant:
BurnTest-AVI(2,42MB)
The burn speed is about 3,3mm/sec. :-)
BurnTest-AVI(2,42MB)
The burn speed is about 3,3mm/sec. :-)
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Zippiot
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Threw together a bunch of nozzle-less big bottle rockets and to my surprize...they worked....
Not as well as the nozzled ones but they still flew. Gotta refine my microwave fuel a bit but its lookin good!
Not as well as the nozzled ones but they still flew. Gotta refine my microwave fuel a bit but its lookin good!
Sailing Student- How do I know if my life jacket is tight enough?
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!
Another nozzleless rocket motor test flight:
Diameter D:30mm; L=180mm; core diameter: d=6mm L(core)=160mm
Propellant: KNO3/Su 60/40 Recristallized - 200gramms
Video (1,68MB)
Diameter D:30mm; L=180mm; core diameter: d=6mm L(core)=160mm
Propellant: KNO3/Su 60/40 Recristallized - 200gramms
Video (1,68MB)
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Zippiot
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Looks to my untrained eye that it doesnt want to go straight...
Works fine with the microwave propellant but there seems to be a minimum length, I'll look more into it.
Works fine with the microwave propellant but there seems to be a minimum length, I'll look more into it.
Sailing Student- How do I know if my life jacket is tight enough?
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!
Me- Can you breathe?
Sailing Student- Yes
Me- Then its too loose!
That's right. The construction is just for test, like firework:Zippiot wrote:Looks to my untrained eye that it doesnt want to go straight...
I calculate my nozzleless rocket motors with Richard Nakka's SRM. The important parameter is Kn(min) and Kn(max). Kn(min) determine D/L ratio and Kn(max) determine core diameter. The nozzleless motor i calculate like nozzled: throat diameter = core diameter (initial) and erosion to fit throat diameter = motor diameter (final)....etc.
(sorry for my bad english)
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Irvine.J
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Cool test guys
That was cool! You rocket guys seem crazy to me, but I just gotta respect you, even the little ones are impressive and inspiring, keep up the good work.
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