75mm Locky Kazoo (say that 10 times fast)
Moderator: Mike Everman
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75mm Locky Kazoo (say that 10 times fast)
Enjoying myself on this one. It took 1.5 hrs to get the engine fully crushed, including making the tooling. Can't expect it to run with that little effort, but it shouldn't have any pinholes!
CC dia is 75mm, over-all length something like 1200mm. material thickness, 1mm (more precisely: .045")
some whacky geometry happens when you have nothing inside when crushing. Unexpected waves make it interesting, and bring some dimensions into question, but oh well. I have everything to make it go this weekend, wish me luck!
CC dia is 75mm, over-all length something like 1200mm. material thickness, 1mm (more precisely: .045")
some whacky geometry happens when you have nothing inside when crushing. Unexpected waves make it interesting, and bring some dimensions into question, but oh well. I have everything to make it go this weekend, wish me luck!
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Mike Often wrong, never unsure.
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Nice work.
Dear Mike.
I'm sure your maths is correct, but I can't help the feeling that the exhaust and induction holes look too small. I can only put this down to my mind wanting to interpret the 2D pictures with circular symmetry.
Anyway, I look forward to hearing what happens when you flush some meths through the pipe and light it. Try and make a (low distortion) recording for us. If you want any advice in this last respect just ask.
Good luck.
Graham.
I'm sure your maths is correct, but I can't help the feeling that the exhaust and induction holes look too small. I can only put this down to my mind wanting to interpret the 2D pictures with circular symmetry.
Anyway, I look forward to hearing what happens when you flush some meths through the pipe and light it. Try and make a (low distortion) recording for us. If you want any advice in this last respect just ask.
Good luck.
Graham.
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Oh I just love that rig! are they really fork lift truck extension legs?
Viv
Viv
"Sometimes the lies you tell are less frightening than the loneliness you might feel if you stopped telling them" Brock Clarke
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No fair using "copy" and "paste"!75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo, 75mm Locky Kazoo ... :) looks cool!!
Here is the dimensional calc output, look at "t outside" column, you see the exhaust throat gets squeezed down to .285".Dear Mike.
I'm sure your maths is correct, but I can't help the feeling that the exhaust and induction holes look too small. I can only put this down to my mind wanting to interpret the 2D pictures with circular symmetry.
Anyway, I look forward to hearing what happens when you flush some meths through the pipe and light it. Try and make a (low distortion) recording for us. If you want any advice in this last respect just ask.
Good luck.
Graham.
Assumptions are that it squeezes with straight faces of length "ctrs", with half cylinders at each end (niether of which actually happen, but it's a starting point), and that the circumference is constant.
So the Throat outside dimension minus material thickness is .195, the area then coming out to: "oh crap, I have to check my spreadsheet!!!"
It's right on how thick, but wrong on how wide "ctrs", which is a derived column.
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Mike Often wrong, never unsure.
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OK, fixed. It was calculating the squeeze right, but an "area check" column pointed out that the "ctrs" dimension was off. I'll include also the drawing this is based on...
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Some more photos. Buffed her out today. CC is 75mm dia, aint she purdy? Real organic. I'll try some meth in it tonight, I got a spark unit from a stove repair shop, and everything for propane feed, but I need to weld the spark and fuel ports monday. Hope to make some noise by Tuesday.
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Mike Often wrong, never unsure.
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IT PULSATES!!!!!
A pool of Methyl Alcohol in the combustion chamber, and a hair drier in my garage, good times! Of course, I have no hair on the back of my hand anymore...
Graham, I'll attempt a recording, but for now, it sounds like: "whoosh! loodle loodle loodle" ;-P
A pool of Methyl Alcohol in the combustion chamber, and a hair drier in my garage, good times! Of course, I have no hair on the back of my hand anymore...
Graham, I'll attempt a recording, but for now, it sounds like: "whoosh! loodle loodle loodle" ;-P
Mike Often wrong, never unsure.
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