75mm Locky Kazoo (say that 10 times fast)

Moderator: Mike Everman

Post Reply
Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

75mm Locky Kazoo (say that 10 times fast)

Post by Mike Everman » Fri Jan 09, 2004 10:39 am

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!
Attachments
lk75 just need trimming.JPG
lk75 just need trimming.JPG (20.45 KiB) Viewed 13102 times
lk75 exhaust closeup.JPG
lk75 exhaust closeup.JPG (19.94 KiB) Viewed 13102 times
LK75 exhaust mid crush.JPG
LK75 exhaust mid crush.JPG (46.85 KiB) Viewed 13103 times
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Fri Jan 09, 2004 10:42 am

more...
Attachments
lk75 intake done, clamps on.JPG
lk75 intake done, clamps on.JPG (20.61 KiB) Viewed 13101 times
lk75 pre intake crush.JPG
lk75 pre intake crush.JPG (21.5 KiB) Viewed 13100 times
LK75 up the Kazoo.JPG
LK75 up the Kazoo.JPG (40.12 KiB) Viewed 13100 times
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Fri Jan 09, 2004 10:43 am

and more...
Attachments
LK75 the setup.JPG
LK75 the setup.JPG (53.02 KiB) Viewed 13095 times
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Stephen H
Posts: 328
Joined: Mon Oct 06, 2003 6:51 pm
Antipspambot question: 125
Location: New Zealand

Post by Stephen H » Fri Jan 09, 2004 11:03 am

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!!

Graham C. Williams
Posts: 571
Joined: Fri Oct 03, 2003 11:33 pm
Antipspambot question: 0
Location: England
Contact:

Nice work.

Post by Graham C. Williams » Fri Jan 09, 2004 11:29 am

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.

Viv
Posts: 2158
Joined: Sat Oct 04, 2003 2:35 pm
Antipspambot question: 125
Location: Normandy, France, Wales, Europe
Contact:

Post by Viv » Fri Jan 09, 2004 2:02 pm

Oh I just love that rig! are they really fork lift truck extension legs?

Viv
"Sometimes the lies you tell are less frightening than the loneliness you might feel if you stopped telling them" Brock Clarke

Viv's blog

Monsieur le commentaire

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Fri Jan 09, 2004 4:17 pm

Oh I just love that rig! are they really fork lift truck extension legs?
Why yes they are! With two holes added. Worked well, but the sections sprung back somewhat; I'm leaving them fat for now.
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Fri Jan 09, 2004 7:00 pm

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!!
No fair using "copy" and "paste"!
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.
Here is the dimensional calc output, look at "t outside" column, you see the exhaust throat gets squeezed down to .285".
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.
Attachments
kazoo, lockwood and four pipe equivalents rev 3.jpg
(136.35 KiB) Downloaded 1310 times
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Fri Jan 09, 2004 7:56 pm

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...
Attachments
kazoo, lockwood and four pipe equivalents rev 4.jpg
(50.71 KiB) Downloaded 1319 times
UAV 1998_3879_2.jpg
(84.96 KiB) Downloaded 1246 times
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Sat Jan 10, 2004 12:43 am

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.
Attachments
lk75 what to do with this intake flare.JPG
lk75 what to do with this intake flare.JPG (21.51 KiB) Viewed 13035 times
lk75 all shiny, take a good look.JPG
lk75 all shiny, take a good look.JPG (32.3 KiB) Viewed 13035 times
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

alex
Posts: 47
Joined: Sun Jan 04, 2004 6:33 pm
Antipspambot question: 0
Location: Sweden

Post by alex » Sat Jan 10, 2004 12:51 am

Mike, which pjet is it?

Alexander

Graham C. Williams
Posts: 571
Joined: Fri Oct 03, 2003 11:33 pm
Antipspambot question: 0
Location: England
Contact:

Post by Graham C. Williams » Sat Jan 10, 2004 1:03 am

Dear Mike.
Run the meths through the motor before you fit spark and fuel feed.
Locating the correct place for fuel injection is important. If your not sure I can send you details.
Graham.

cudabean
Posts: 80
Joined: Tue Oct 14, 2003 4:30 pm

Post by cudabean » Sat Jan 10, 2004 2:26 am

Mike,

Cool looking divergence on the exhaust. Good luck!

cudabean

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Sat Jan 10, 2004 6:31 am

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
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Mike Everman
Posts: 4894
Joined: Fri Oct 31, 2003 7:25 am
Antipspambot question: 0
Location: santa barbara, CA
Contact:

Post by Mike Everman » Sat Jan 10, 2004 6:41 am

Mike, which pjet is it?

Alexander
Alex, it is equivalent to a Lockwood with a 75mm diameter combustion chamber, only a bit simpler to make!
Mike
__________________________
Follow my technical science blog at: http://mikeeverman.com/
Get alerts for the above on twitter at: http://twitter.com/mikeeverman

Post Reply