SpudFiles

Ok now that I finally understand how hybrid fueling works I think it is high time I start on building one. The part I am still little fuzzy about is building these things strong enough to withstand the shock wave upon ignition anyhow I got a idea in my head and I would like to get a seal of approval from you guys BEFORE I start. like I said I am still in the design phase anyhow here is my idea for a chamber it is going to be composed from a thin shell of steel with a thick inside of A356 aluminum...

ughh I am crap at explaining anything, on to a diagram




the wall thickness of the aluminum is going to be 20mm thick I added the fiscal properties of A356 aluminum at the bottom

my question in short is: will this be strong enough for a 10X hybrid

and like most of us, I have already tried my hand at modeling this cannon in HGDT I am hoping it turns out close to this





properties of A356

Density 2.67 g/cc 0.0965 lb/in³
Tensile Strength, Ultimate 234 MPa 33900 psi
Tensile Strength, Yield 165 MPa 23900 psi 0.2% offset
Elongation at Break 3.5 % 3.5 % in 50 mm
Modulus of Elasticity 72.4 GPa 10500 ksi (Tension)
Poisson's Ratio 0.33 0.33

my estimated burst pressure of the aluminum alone: 14,700 psi. Estimated safety factor for 10x: ~14.7. Do you feel like stepping it 50x with a safety factor of 3?

How are you buying the Aluminum, as tube or as bar and then machining it?

ramses wrote:
How are you buying the Aluminum, as tube or as bar and then machining it?

you will have to wait and see, but I guarantee that I will keep you guys in the loop throughout the entire manufacturing process

50X would be cool but I do not have a source of air at that that pressure that is why I am limited at a 10X mix but I do intend to leave the option open to allow higher mixes

you got me all exited now, I think I am going to start on this next weekend if time permits

PS. Thank you for calculating the burst pressure for me