ox1111

I would imagine the shapes you show to be stronger and lighter. Also very costly to build, thou this is not to say not practical. Beside cost, complex shapes also have the disadvantage of complexity itself, more to fail. This is untested, but an idea you are welcome to. If you fill the cavity with shapes, like say balls, light wieght balls of super thin plastic like the type in a ball pit for kids and then fill with epoxy or super high density urethane too form a bubble honeycomb similar to the structure of bird bones.

How about just a smooth inner and outer skin with instead of a truss shape inside, an injection of high density polyurathane foam?

Hey, its your rocket. I can tell you that solid mag. is not as much of a problem as powder and flames are not as much of a problem as sparks. I can tell you building costs go way up and people have to be trained and cert in working with mag. I doubt you will find any welders cert. and you will need clean air welding mask I am sure by osha. You might require semiannual blood tests as well. I have a block of mag with a flint on it in my first aid kit. You shave some with a knife and use the flint and it goes up quit nice. Another issue you may have is any hardware you use or any other material that contacts the mag. may react, esp. in rain or high humidity.

Physical and chemical properties Elemental magnesium is a fairly strong, silvery-white, light-weight metal (two thirds the density of aluminium). It tarnishes slightly when exposed to air, although unlike the alkali metals, storage in an oxygen-free environment is unnecessary because magnesium is protected by a thin layer of oxide that is fairly impermeable and difficult to remove. Like its lower periodic table group neighbor calcium, magnesium reacts with water at room temperature, though it reacts much more slowly than calcium. When submerged in water, hydrogen bubbles will almost unnoticeably begin to form on the surface of the metal, though if powdered it will react much more rapidly. The reaction will occur faster with higher temperatures (see precautions). Magnesium's ability to react with water can be harnessed to produce energy and run a magnesium-based engine. Magnesium also reacts exothermically with most acids, such as hydrochloric acid (HCl). As with aluminium, zinc and many other metals, the reaction with hydrochloric acid produces the chloride of the metal and releases hydrogen gas. Magnesium is a highly flammable metal, but while it is easy to ignite when powdered or shaved into thin strips, it is difficult to ignite in mass or bulk. Once ignited, it is difficult to extinguish, being able to burn in nitrogen (forming magnesium nitride), carbon dioxide (forming magnesium oxide and carbon) and water (forming magnesium oxide and hydrogen). This property was used in incendiary weapons used in the firebombing of cities in World War II, the only practical civil defense being to smother a burning flare under dry sand to exclude the atmosphere. On burning in air, magnesium produces a brilliant white light which includes strong ultraviolet. Thus magnesium powder (flash powder) was used as a source of illumination in the early days of photography. Later, magnesium ribbon was used in electrically ignited flash bulbs. Magnesium powder is used in the manufacture of fireworks and marine flares where a brilliant white light is required. Flame temperatures of magnesium and magnesium alloys can reach 3,100 °C (3,370 K; 5,610 °F),[7] although flame height above the burning metal is usually less than 300 mm (12 in).[8] Magnesium may be used as an ignition source for thermite, an otherwise difficult to ignite mixture of aluminium and iron oxide powder. Magnesium compounds are typically white crystals. Most are soluble in water, providing the sour-tasting magnesium ion Mg2+. Small amounts of dissolved magnesium ion contribute to the tartness and taste of natural waters. Magnesium ion in large amounts is an ionic laxative, and magnesium sulfate (common name: Epsom salt) is sometimes used for this purpose. So-called "milk of magnesia" is a water suspension of one of the few insoluble magnesium compounds, magnesium hydroxide. The undissolved particles give rise to its appearance and name. Milk of magnesia is a mild base commonly used as an antacid, which has some alloy is much more safe

I know the old and maybe currant nuc’s were built with thin walls and pressure tanks. You only need the strength at lift off and till the G’s taper off. I guess if you intend to reuse it, it doesn’t make much sense. Magnesium is great, but flammable. They have used it successfully in formula 1, but their have been cases of detonation. Still seems viable for many parts. I never real thought about rocket, but your post was so detailed and I love creative problem solving. Could you do a cylinder inside a cylinder design with your extrusion having a double wall? I would not recommend a tank inside of a tank, but your double wall extrusion providing a fail safe maybe ok, and with a little radial trussing between tank super strong maybe even strong enough to reduce your extruded thickness. If I started a space rocket program from scratch, I would probably start with a ground tank system with high pressure hoses feeding the rocket to a 100 or 150ft and then have them detach with exploding bolt with a snap coupling back-up. That way you are not lifting your lift off fuel saving cargo cap. Sounds crazy but its real not, hoses these days are super strong and flame retardant and we use them to feed blast furnaces and other app.

After reading all this I must say, you probably shouldn't waste your time. If you really insist the best idea I can come up with is use a weed Wacker engine with a flexible shaft to drive the wheel or if you want to go electric. I'm sure a 20 V lithium-ion battery pack and a half inch chuck, Dewalt drill will get you going, and they come with three speeds so you could pick the one that works for you. That'll get you testing and prototyping and you can fill out what you need from their.

With the extruded design, it would probably be unwise to make fuel tanks out of it, unless holes were drilled so fuel could fill the cavities, otherwise the temperature difference could buckle the aluminum. In most of these rockets. The pressure of the fuel prevents buckling, so are you talking about making the entire rocket out of extruded aluminum or just the parts where cargo would be held? Are these the be used for space or weapons, space all the loads are with gravity and multidirectional strength is unnecessary?

This is such a diverse article. I'll stick to subjects that others may not. In trueth we as a nation defy nature and wonder why things are getting worse. In us past it was very common for 25yr to date 14yrs. I can't say this works today because it really only works in women being homemaker societies. 14yr girls are looking for love and today we see them as children, frankly you can't even stand to be around them. It really does make more sense that at least one of the two people having sex is mature and if she would get preg. that he can afford to raise the baby. This also makes boys mature into men, because in the societies such as these boys are undesirable and not only must mature, but must reach a social status before breeding. This sounds terrible but let's look at our current model We in America now like to keep our teens banging other teens in turn having teen mothers and fathers both being terrible parents teen pregnancy is draining society's wealth and each generation regressing to the fact of having immature and unprepared parents. Let's keep allowing generation after generation of babies raising babies and see how fast we can turn back in the caveman. To me it seems both methods seem unsettling but keeping everybody a virgin till 25 years old doesn't seem fair either. I have four children two boys and two girls and a lot of figuring out. One thing I can be sure of is that I will not let societies norms dictate my actions. I would like to thank the original poster of this article for the courage it must have taken to bring the subject to light and a maturity in which it was done.