Recent content by Ozen

Fuel is CH4 + LOX. Software I used to help automate design (after verifying the software calculates it correctly) was RPA. 3.2 mixture ratio with 700 psi chamber pressure. The fraction of elements on exit also depends on the nozzle geometry, but that's a secret! One thing I am finding out is...

Thanks for the detailed information and links! It'll take me some time to read through them though. Manufacturing wise, it wouldn't be an issue. The plan is the nozzle would be made by 3D metal printing, which often are in a vacuum environment, the machines I'm eyeing even list Ti-6AL-4V as a...

Correct. The engines are VERY heavy, they are usually made from dense materials like copper, steels, INCONEL, etc. The propellant tanks making up most of the remainder are usually a aluminum alloy, carbon fiber matrix, a composite, or even now 304L SS. the walls are very thin as well, so the CoG...

Yes you are correct, the engines are first taking the initial blunt of re entry. However they create a stagnation zone. It has been proven this method does work for recovery, Rocket Labs Electron booster has been successfully recovered multiple times now this way. They don't even use a landing...

Titanium does become more brittle at cryogenic temperatures, but that is a common trait even with steels and aluminums which been extensively used in rocketry (steels especially have been used on the nozzles while aluminum for propellant tanks). From what I know, the waters primary purpose is...

Thanks for the reply! Above are the different methods for the cooling channels. The most common are the tubular jacket and milled channels. My design uses the milled channels but with 3D printing. But you can see the outer liner is only exposed to the coolant channels containing the cryogenic...

Industry standard right now is a copper alloy (usually an aluminum bronze) inner liner to promote heat transfer to the coolant channels and the walls of the channels and outer liner are usually made of an INCONEL alloy, usually either 625 or 718. But INCONEL is VERY expensive and heavy. The...

Been reading Rocket Propulsion Elements 9th Edition and got approval from my university to design a bi-propellant liquid fuel rocket engine for my senior design project, and I've been understanding everything so far but I haven't quite found an answer to how the pressure works throughout the...

Thanks for the source, I'll check it out when I have time! In ANSYS, I use Explicit Dynamics (AutoDyn) instead of LS-DYNA. While I have a key for LS-DYNA, it is confusing to work in while I can use explicit dynamics directly in workbench and streamline my work. The material models I use are the...

This is a bit of a multi-part question on impact engineering and FEA usage. I am working on making my Alumina ceramic model as accurate as possible in ANSYS for impact simulations. But I am noticing a common theme, while using model parameters in scientific journals I am not getting any...

Been researching armor piercing mechanics but I can't seem to find a reliable model for hand calculations. What makes matters worse is I don't know the correct value for the design I am studying. Only 3 formulas gave me similar results: NAVY 1940's "Universal" Formula, Original F-Formula, and...

Let me start off by saying I decided to post this in the aerospace engineering thread because it directly deals with thrust, even though it is not for a plane or similar. I have two equations that I can use to calculate the force on a baffle of a muzzle brake, Equation 1, from The Engineering...

Extending the push rods would go back into the issue of not enough space. And the buttons will be silicone rubber molded so I'm not sure about the stability for that either. Fiber optics like Tom suggested after you have the disadvantage of it changes the way the light emits from it. So with the...

I need the three boards due to where critical pieces have to be. Like 3 push buttons will be on the side of the device, so perpendicular to the main PCB. The other one is mounted on the floater for the LED. You suggested using a mirror, but that would not achieve what has to happen. The source...

The term wires was a rough term I used because I don't know exactly what it would be called. This is what I am thinking of using to connect them...