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Author	Topic: Zink
Fjp92 Frequent Poster	posted December 22, 1999 04:49 AM Does any one know if i can use zink in any fuel oxidizer mixtures. Can it be used in rocket fuels insted of alinimium or magnesium? I would be glad if any one can help!!
nbk2000 Moderator	posted December 22, 1999 07:12 AM ZINC! Please at least spell the elements correctly. And it can be used mixed with sulfur as a rocket propellant. I don't know the proportions at this time. I saw it in the amateur scientist section of an old (1950's) "Scientific American" magazine. Also reacts with water when mixed with ammonium chloride (so I've heard). ------------------ "The knowledge that they fear is a weapon to be used against them." www.50megs.com/nbk2000
HMTD Factory Frequent Poster	posted December 22, 1999 07:16 AM Yup, Zinc and Sulfur(the recipe says 1:1 by weight), pressed hard and firmly into a tube to make it a small rocket fuel, some guy killed himself because he packed it loosely, he was just using a thick paper tube, don't mess with it. Zinc powder kinda explode with sparks when ignited, thats a plus, it's heavier than Al and Mg, thats a minus. Once I filed some zinc, put it in a deep steel tray, then heat it above a gas stove, using pliers to hold it suspended. 'cuz the flame is covering a larger area than the tray, so the tray is kinda surrounded by the hot air, the powder didn't meet with the flame but there's a cloud of spark keep going on slowly 1" above the tray, which is nice if the light is off.
Fjp92 Frequent Poster	posted December 22, 1999 12:05 PM Sorry about that spelling. In my language we use the k insted of the c . It is kind of difficult for me cause the spelling of most of the elements is almost the same in english and afrikaans with here and there things like c and k that differs. My classes is in english but i studdy and make notes in afrikaans cause then i remember better and this sort of fucks around with my spelling. Question? Will Al displace Zn from a Zn salt solution? I tried and it didnt work. Al is the more reactive and there fore it sould if i am not mistaken. But sometimes Al get pasive But that is only when there is something with oxyzen in it that can react with it.
HMTD Factory Frequent Poster	posted December 22, 1999 06:38 PM I tried that Al-replace-Zn thing before, doesn't work at all, if you wanna get zinc metal, try to strip some Zinc-Carbon battery, that's old style battery before alkaline ones , it better be used batteries, otherwise you short the battery accidentally, it explodes.
fart unregistered	posted December 30, 1999 05:24 PM heat of formation of zinc oxide is: ZnO=84 kilocal/formula wt or 84 kilocal/81 grams or... 1034 calories per gram of ZnO made. heat of formation of aluminum oxide is: Al2O3=389 kilocal/102 grams or 3813 calories per gram AL2O3 made So, Zinc will work but there will be only about 1/4 the energy available from the creating a gram of ZnO compared to Al2O3 Zinc sulphide is 46 kcal/97 grams or 484 calories per gram of zinc sulfide However many explosives only produce about 500 calories per gram of explosive which is the same as the weight of the sum of all products created when it "goes" When making rocket propellants packing density is critical, for it is being used to force the material to burn on the end of the packed cylinder ONLY. If anything happens to allow flame to go down the sides of the stuff or to force itself into the powder that's too loose, burning will go berserk, and pressure will get enormous, the container will burst, and baaaaad things will happen to anyone in the vicinity. The ability of Zinc and sulfur to make a propellant is that the zinc sulfide probably leaves as a gas, which quickly condenses, but that happens outside the nozzle, after its already pushed the rocket. Zn + S = ZnS 65gms + 32gms = the balanced mixture A former poster gave the ratio as 1:1 which is 65 gms Zn, and 65 gms S In this mix 65 gms Zn would consume 32 gms of the sulfur and leave 33 grams sulfur to be turned into gas by the heat of the burning. Thus this mix would burn much more slowly than the balanced mixture, and also have much more gas to eject (and its added weight which would give more push). Someone probably experimented with many burst rocket motors to find that if you kept adding too much sulfur, the blast got less, and at the 1 to 1 ratio IF YOU FOLLOWED THE DIRECTIONS ON HOW MUCH PRESSURE TO PACK IT AT, it would not burst the rocket motor. Remember, rocket propellants are an ART, more than a science. How you do it is as important as is What you do. Safety around rockets goes up as the square of your distance from them. Do have a lot of distance between you and them, when the count down reaches zero.
nbk2000 Moderator	posted December 30, 1999 06:47 PM The ratio for rocket propellant is 3:1 sulfur and Al. Which one is the 3 and the 1, I don't recall at this time. It can be found in a copy of scientific americans amateur scientist book form the 60s that can be found in most large libraries. ------------------ "The knowledge that they fear is a weapon to be used against them." www.50megs.com/nbk2000

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