views1995

Sweet that all makes sense and thank you for responding.

Hello again I have a couple questions that I was hoping you could help me with. I was wondering if you could tell me where you found the fact that in small hobby rockets that the average heat transfer from the hot gasses to the chamber walls is about 0.5 Kw/cm2/sec. Also, how do these units work out because doesn't average heat transferred have units of W/m^2 not W/m^2/sec. Next, could you expand on what you mean by using two reservoirs to bring the water leading to the cooling jacket up to 10 m/s. Thank you for everything.Your updates have been very helpful.

Yeah copper definitely will make life a lot easier. Thank you for the response. I also have another question about your ideas for the cooling jacket. I was wondering essentially how you were planning on designing your cooling jacket. Wether you'd mill in a solid liner through your chamber walls or attach a liner of various tubes to the outside of chamber walls or if you had some other idea. I feel that milling a solid liner through the chamber walls will be out reach for my machining capabilities so I thought of some other designs for the jacket. I drew a picture but it seems I am unable to upload it so I will just describe it. It would be a design of two half cylinders as long as the entire rocket engine. These two half cylinders would be bolted together to house the entire rocket engine inside. Then, water would flow in between the inner walls of these half cylinders and the outer wall of the rocket engine. I would figure a way to ensure that the seal between the two half cylinders would not leak water but I may be overlooking complications of having bolts and nuts in a rocket engine design that is experience such high temperatures. I know it may be a little hard to understand what I'm describe so don't worry about if you cant visualize it. Thanks again.

Hello, So currently I am attempting to do essentially the same thing for a research project in school. Only differences that I currently have compared to your design is that I am attempting to use gaseous oxygen and liquid kerosine as my propellants and that I may be looking into a different material other than copper to manufacture the rocket engine. I was wondering what people thought about using titanium for the fabrication of the rocket engine. I am most concerned by the thermal conductivity value of titanium which is much smaller than that of copper. Would it be feasible to build a beginner rocket from titanium or would it be best to stick with copper? Thanks for any help and I am excited for the next post.