Grains are truly hard like a rock.
I use method in which first I dissolve Kno3 and table sugar in water. Then
keep to boil and do a continue stir. When I feel it's almost nonstick and
ready to scoop I remove it from a skillet and start filling grains in
casings made for making grains actually a stand and already added
inhibitors in a casings.I use plunger to push propellant to avoid any
bubbles. After filling, let it dry for and then they are ready to insert in
a motor. At this time I've maintain the temperature so I do not maintain
temperature. At first I dissolve both at around 250'C and at last I keep it
on 150'C.
On 09-Jan-2018 7:48 pm, "James Yawn" <jyawn@xxxxxxxx> wrote:
Sunny: Sugar propellants produce a lot of ash, but when a motor burns OK,
almost all of it goes out the nozzle. That's the white smoke. A little
may remain in the motor, but it is in liquid form, and is not thought to
cause problems with large nozzles, such as yours. So that is not my first
guess as to the problem.
Did the grain burn after the motor burst? Sometimes they are extinguished,
sometimes they make a fireball.
Maybe I asked this, but don't recall... Is your propellant hard and solid?
It should feel like a rock. If it's crumbly, then you might have
disintegrating grains. Could you describe your process for making grains
again? Ingredients? Temperature? Technique? that might offer some clues.
Jimmy
On 1/9/2018 9:08 AM, Sunny Gavali-Bhosale wrote:
Sorry, I didn't get any grain particles. Just got casing with nozzle in OK
conditions about 70m to 80m away from test side.
I've read table sugar burst too hotter than other sugars. you may assume
sorbitol, dextrose. So this may be the reason that its producing too much
pressure inside than other motors produce.
My propellant lefts some ash after the burn.so, I guessed that might be
creating mess at nozzle throat to overpressurization.
On 09-Jan-2018 7:24 pm, "James Yawn" <jyawn@xxxxxxxx> wrote:
Sunny: I don't understand this question:
On 1/8/2018 11:47 PM, Sunny Gavali-Bhosale wrote:
Does propellant residue results in PVC motors?
Do you mean does the residue result in CATO?
