SpudFiles

Some more photos of the gun including:

-Honing the union to "screw easy"

-and a hint at the spark strip design...

nice work ive always wanted to build a hybrid but i dont have access to proper materials or machining

Yea I really only have a cheap abrasive saw, grinder and files to do this lol. Oh yea and a Tig welder... I guess that kinda helps.

If I had access to a mill and lathe this gun would look like poo compared to what I could make lol.

wow i still have nothing compared to you (tool wise).

all i have is a drill, a hacksaw, 2 files and duct tape

Depending on where you live, yardsales (if your not from the US, they are basically people selling extra stuff they have in their house, and it's usually in their garage, driveway or yard that they display the "junk") are a great way to pick up used tools very cheap, esp if you've got some bartering skillz...

Whoa, awesome project here! I love to see stuff like this. I check this site like every day hoping to see something that is inline with my own taste, and that doesn't happen often at all, but this nailed it hard. Can't wait to see this thing really get going. Nice modeling btw. Thats the way to go man.

i live in Canada (BC) but im moving soon so i got to keep my spudding low for now. also im moving 2 blocks away from a reuse it center for building supplies :blob: lots and lots of cheap plumbing parts!!!!!

Thanks Mr. Bogg - Your creations have definitely been an inspiration for undergoing this project, mostly the fact that you made the striker with no major machinery!... something I'll unfortunately be forced to do with this as well.

All modeling was done in photoworks 360 - SolidWork's proprietary rendering software... What do you use for yours?

mobile chernobyl wrote:Thanks Mr. Bogg - Your creations have definitely been an inspiration for undergoing this project, mostly the fact that you made the striker with no major machinery!... something I'll unfortunately be forced to do with this as well.

All modeling was done in photoworks 360 - SolidWork's proprietary rendering software... What do you use for yours?

Same program. Solidworks 2009 professional. I love it for fiddling around with cannon designs. I don't use the photoview 360 but use the photoworks right in the solidworks interface (same thing either way). Good luck and i'll be watching you!

Updated spark strip info.

Here is the model, it consists of:

a 1/4NPT X 1/4"Tubing compression fitting, bored through

The inner rod is 3/32 316 welding filler rod,

surrounded by 5/32 PE tubing (perfect ID fit for the filler rod! couldn't resist),

Finally with 2.15" sections of 1/4" x .035" wall 316L tubing - spaced .16" between each to provide a spark gap.

The rear portion extends back far enough away to avoid creating a shorter gap for the spark strip to cheat from.

The overall in chamber length of the spark strip is appx. 12", with 6 spark gaps.

Fiddling with the HGDT has show us that 6 gaps will provide 300FPS gains over 1 gap, whether or not this is true... I can not yet verify. But if I could even get the 1 gap FPS results from the HGDT lets just say I'll be pretty happy!

The trickiest part will be sealing the rear most's 1/4" tubing gap between it's ID and the 5/32" OD which, if you do the math, provides for a .015" gap (before compression fitting crushes the 1/4" tubing lol). I was thinking some sort of RTV or silimar silicone would be well suited for the 2300*C flash at 8ms long, and 1000+PSI pressure spikes? Sorta sounds like a car engine lol...

Oh yea the render...

That render looks real as hell. Nice job. Multi spark gaps allow some peace of mind by making sure you get the most out of your combustion. Hybrid or not, I am all for multi spark if possible.

Haha thanks, I never really got to utilize my computer's power to it's true potential before messing around with render settings. I can do that render in a 1024 size at best quality in appx a minute. my overclocked Q9450 3.2Ghz @ 4 cores is handy for that kind of stuff since a render program actually utilizes all 4 cores.

I thought about making a new thread for this, but I'll just post it here.

It's a PDF on Ultrons CLGG developement. For those who don't know what CLGG tech is - it's pretty much the correct terminology for our "hybrids" except we're not using a true light gas for the fuel.

http://www.dtic.mil/cgi-bin/GetTRDoc?AD ... tTRDoc.pdf


I especially like the folding skirt design... it's patent pending but for hobby use - personal observational use on private owned property... ahh you get the idea.

enjoy

Great stuff in the PDF.. I'll have to finish reading it later. I got to the pressure wave containment my ignition locations and energy. The modeling of the pressure waves and control of DDT with buffer is great stuff. Unfortunately, I'll have to finish later. Thanks for the PDF.

mobile chernobyl wrote: I was thinking some sort of RTV or silimar silicone would be well suited for the 2300*C flash at 8ms long, and 1000+PSI pressure spikes?

Epoxy should do that perfectly.

This is a nice build, a good balance between power and function. I am looking forward to seeing this gun done and loaded.

Not much to say otherwise, seems as you have got it all under control. Makes me want to build a mid sized hybrid though..

Good luck.