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About r1dermon

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  • Birthday 07/02/1985

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  • Interests
    model rocketry, experimental rocketry, high power rocketry, r/c, fishing, boating, excersizing...
  • Favorite Area of Science
    chemistry..tough though...
  1. as i haven't posted in several months, just an intro. i work in the field of pyrotechnics as both a hobbyist, and a professional. in my occupation, one of the main compounds i come into contact with is flash powder. just a standard binary KClO4:Al flash powder with no adulterants. as probably the majority of you know, this is a pretty dangerous substance if great care is not taken when mixing, storing...etc...so naturally, the industry has introduced a new flash powder product which is supposed to be "safer". of course, "safer" is in the eye of the beholder, and honestly, upon confine
  2. to my best knowledge, thermodynamic stability is a gauge of how readily a compound will reduce to form a product...(correct me if im wrong) kinetic stability on the other hand is a gauge of how much input kinetic energy is required in order to initiate a reaction...(correct me if im wrong) with this in mind, a standard pyrotechnic composition would be extremely thermodynamically unstable, meaning, it reacts vigorously to form products upon reaction...however, since most pyrotechnic compositions require an outside energy source to be initiated, i presume, pyrotechnic compositions would
  3. traditional black powder is often described as containing potassium nitrate as it's primary oxidizer. however, in blasting, there's a different formula which utilizes sodium nitrate. in my experience, sodium nitrate doesn't produce quite as "fast" a propellant as KNO3. one of the major differences is that sodium nitrate is much more hygroscopic, and is easily fouled by humidity. here's my question. in my field (fireworks), sodium nitrate is regarded as inferior. the only reason it's preferred in blasting, is because it does an acceptable job, but for around half the price. im wonderi
  4. In my side career, im graced with the opportunity to create some spectacular visual effects. One of these is a fireball. Generally speaking, we can use cremora or naphthalene in powder form, resting on a bed of black powder, and initiated via electronic match from a distance. This produces a decent flame ball. One of the crowd favorites is the petroleum flame ball. The same process is undergone, however the black powder is isolated in an inert container. This produces a very intense effect. Vast quantities of heat are given off, and the ball of flame exhibits a very cool rolling effect. My que
  5. normally, in the industry in which i work (fireworks manufacturing), we're using a mixture of Al, antimony, a very small percentage of sulfur, and a large portion of KClO4 for our salute composition. recently, someone posted a video online about something named "blue" aluminum. as many of you probably know, flash powder is incredibly dangerous to mix and to be around in general...and in the quantities we mix (up to 40lbs through a screen at a time), the results of an accidental reaction due to static or friction, or what have you, would be absolutely catastrophic. well, this "blue" aluminu
  6. basically, im trying to determine the force applied to the ground over the area of the bottom of the mortar tube. im not sure if it would be easier to figure for N, or Ns. so lets say an 8" shell weighs in at 7lbs even, and at apogee, gets 800ft above the ground and takes 5 seconds to attain that height. given the information, how would i calculate the net force applied to the mortar? like i say, im pretty "in the dark" so-to-speak, in regards to physics.
  7. hey all, by no means am i a physics major, or professional, but i know a little bit...with that in mind, i was posed a question by a fellow fireworks enthusiast over the weekend. so here goes. basically we're trying to calculate the recoil force of an aerial shell upon launch. there's a second part of the question that might be a little too complex given the information we have, but i'll get to that in a bit. ok, so lets say the shell weighs 100g, and attains a height of 200ft. given that information, what is needed to calculate the force of the shell in motion, as well as the mortar
  8. i have some accelerometers that i've tested at sonic speeds (less than 1500fps), which record the Cd as the pressure spikes during the flight. assuming a hypersonic vehicle could be built (it's beyond my capabilities), i have no doubt my electronics could record atmospheric pressure changes, as well as changes in the weight/drag of my rocket in relation to the atmosphere at mach 5, 6, 7...etc...the fastest rocket i feel i could make without failure would be mach 2ish. mach 3 would be pushing it, but hypersonic is out of the question for now. (for me anyway).
  9. like has been stated, this is a very complex question (about the building), without knowing the circumstances. when there's an EXTREME low pressure system hovering right outside of an enclosed house, the house will attain a higher pressure...release that pressure and poof your house implodes...the pressure can be released in any number of ways as well, a tornado throwing a car through the front wall...all the windows simultaneously giving out, the roof getting ripped off by a tornado...etc...once it implodes and breaks apart, it becomes little pieces of debris, and can be tossed around like br
  10. anyone at all? my thought process is that sugar should act as a binder, and as a decent fuel, it shouldn't detract too much impulse, the detergent water is the solvent, so the sugar should harden up the motor once all the detergent water is out of the mixture...and since smokeless powder is a plastic, there should be no problem with dissolving the KNO3 normally found in regular "black powder". any thoughts?
  11. most solutions readily attainable from a pharmacy are 3% conc H2O2 iirc. i'd say whoever said 6% is the highest to go is right on the money...H2O2 is a crazy crazy crazy chemical. (but when experimented with properly, can result in AMAZING reactions...including extremely powerful rocket motors. haha)
  12. it's definitely safe to swish around (dont drink any quantity), as for it's whitening affect, it's tough to say, in such a diluted solution, it probably will have little effect. Just buy the "white strips" for 20 bucks, they last for weeks and work quite amazingly.
  13. I will say that generally, I feel that I was not taught sufficiently in high school. Not 1 physics course, not 1 calculus course, not 1 trigonometry course. I was given a very basic geometry course (geometry is fairly basic anyway), and Algebra 2 was my toughest math course. In-fact, I'd say that Chemistry was my toughest math course really, and even that was a call-in. After high school, I picked up the hobby of advanced amateur rocketry, and I've taught myself more than I learned in 12 years of public education. From physics to trigonometry, fluid dynamics, general mechanical engineering, ch
  14. r1dermon

    Ocean currents

    right, however, surface currents are often driven by trade winds, and ALL currents are affected by the coriolis effect. the same reason a hurricane's path looks like a boomerang.
  15. im trying to cast smokeless powder into a rocket motor (bates grain geometry or maybe just single grain cored geometry). i've come up with one possible solution, and im just looking for input. sugar, detergent, water, nitrocellulose powder. compact into the grain mold, and leave in a curing oven over the course of a few days at 110ish degrees. any insight or other possible solutions?
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