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Ok i have managed to raise some more cash, so i am back on track. I had a long talk with a friend that works with furnace exhausts for central heating systems. he suggested to just use carbon fiber with epoxy. just let the surface epoxy burn away apparently high temp open flame valves in some design...

Good idea about the kiln, ebay here i come.

I think graphite is to brittle to survive the rigors of combustion.

Phenolic resin, as i have learned, is dangerous stuff and difficult to manufacture so i have decided to stay clear of it. I will go back to trying to manufacture with alumina, i have talked to a professor at the university that knows about these things and he has given me a recipe for manufacturing ...

pezman The cork schould work for your construction, no problem, just make sure you get pressed cork not glued. Zippot Wood could work but phenolic resin seams to be a possible solution for my filament winding dilemma, it only needs to work for 3-5 minutes and if i understand correctly, these resins ...

Really? $ 30 :) i wish i could make anything that cheap. I bought 4 types of cork Cork 1: Pieces of cork glued together Cork 2: Large almost continuous pieces of cork Cork 3: Pressed pieses of cork Cork 4: Rough large pieces of cork glued together Testing methodology: å butane torch burning the surf...

Irvine.J Cork what a great idea! i will buy a cheat and burn test it today! Jimbocrete? with heat resistant binder? might work as well actually? another experiment i schould do. I dont think i will try the boric acid though. LINZ Are you sure your refractory lining fell out because of differential t...

Well so far i haven't made much progress, carbon carbon composites are out of the question, a rough calculation gave me a manufacturing cost roughly 53 000 over my remaining budget. The materials specilised equiptment and energy needs is way beyond me. I also have a problem finding a suitable bonder...

Thank you for all the ideas and innput. Pezman The refractory i tested with the steel pipe was actually alumina potting compound that i spun cast into the pipe, i then stuck it in the firing oven and it came out as 2 separate pieces. Your tile idea might work but it will complicate fabrication and i...

Thank you for the input, i did try the refractory idea early on. I coated the inside of a steel tube with a high temperature coating. The problem with this approach is that the metal and the refractory expanded at different rates when heated. The refractory simply fell out since the dimeter of the s...

Failure! yet another attempt wasted. I am starting to think that i wont be able to manufacture the body tube from alumina. I tried cutting it with a CO2 laser but the temperature gradient created enough internal stress in the material to blow itself apart. The pictures are the biggest surviving piec...

I have been working on making the engine tube for my experiment, but Ceramic alumina is a horrible material to work with, before its fired its brittle and cutting/grinding isnt really working, it always ends up like a broken plate. Does anyone have any experience with using ceramic alumina? if so i ...

I am new here, i have been fooling around with rockets for a while, but i have been thinking about building an ducted version or ram rocket for some time. The problem is (as it seams to be for many) to get the thing up to speed to get useful performance out of it. Thanks to Glen Olson and his site h...