50 and 75mm Kazoo Test Band, apply here

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Mike Everman
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Post by Mike Everman » Fri Mar 12, 2004 8:23 pm

Thanks Bruno! Faaaaascinating. You say you have some proportion guidelines of some sort?
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50mm kazoo progress

Post by Mike Everman » Fri Mar 12, 2004 9:18 pm

Progress on 50mm shorty Kazoo, haven't flared the intake yet. The squash didn't go too well, tooling was off and took the exhaust too far, tried to open it up, but couldn't get the section nearest the cc to open. I'll try it anyway, since it's all voodoo!
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50mm KAZOO, full.JPG
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Post by Viv » Fri Mar 12, 2004 9:40 pm

I really do like this construction method Mike, keep it up mate.

Viv
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Monsieur le commentaire

resosys
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Post by resosys » Fri Mar 12, 2004 10:03 pm

Yeah! A little fatboy.

I agree with Viv, keep it up.

When do we get the rough edit of the "Make a Pulsejet with your car" Instructional Video Series?

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Post by Bruno Ogorelec » Fri Mar 12, 2004 11:16 pm

Mike Everman wrote:Thanks Bruno! Faaaaascinating. You say you have some proportion guidelines of some sort?
Yes. Here's the pic. The broadest diameter of the spike (marked 100 on the pic) should be equal to the internal diameter of teh intake -- for the cylindrical version. God knows what for the squashed layout, but I suspect the thickness should be about equal to the breadth of the intake slit. Stands to reason. I have no hard and fast dimensions for the cowling, but it shouldn't be critical.

(I have left the picture big so that the numbers are clearly visible. You'll have to download it. But, I suspect you'd do it anyway.)
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Post by Raymond G » Sat Mar 13, 2004 12:10 am

Mike,
Thanks for sharing your Kazoo work. Very interesting. I was considering an ignition setup similar to yours for a little 'burner' I'm playing with in the garage. How are you getting the sparkplug to screw into the sheet metal? Have you welded a boss? Do you tap the thin sheet metal? Also what is the power source? A Battery? Sorry for all the questions, but ignition is not my strong point and I would appreciate any help you can give.

Regards,
Raymond

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Post by Mike Everman » Sat Mar 13, 2004 1:10 am

Thanks Bruno. Much to chew on.
Raymond G wrote:Mike,
SNIP How are you getting the sparkplug to screw into the sheet metal? Have you welded a boss? Do you tap the thin sheet metal? Also what is the power source? A Battery? SNIP
Regards,
Raymond
Raymond,
Alas, I have not made the sparkplug work, I used a torch to light the 75mm, and blew the flame into the CC. I actually didn't give much of a chance to the spark, in the interest of time, but I will be using it soon. It made me a bit nervous, gas flowing, sparker tic-ticking, all of it getting ready to shoot a giant fire-ball, but I'll gird meself up and try it soon. I must for the little guy, It's much harder to do the torch-light method as size goes down; it wants to blow out instead of be pushed inside with the air gun.
As for spark generation, I got a new AC spark unit from a stove repair shop and put it in a box with a lightswitch. I also have one that takes a AAA battery, I'll attach a photo. Both are fairly anemic, but I'll let you know if they are effective soon. I just read that it's preferable to use direct injection of air that washes over the spark gap. Makes sense, as at some point after the puff of air, the mixture will become just right next to the sparkplug...
Oh, yes, you can tap the tube wall for the plug, but if you over-tighten, it's history, and never made a very good seal to begin with, but that didn't hurt the 75mm Kazoo. This time I'm welding on a nut to hold the NGK CM-6, 10mm thread. I turned off the hex and the plating on the mating face. I'll put a similar nut for the fuel feed port, as this is close enough for jazz to a 1/8 NPT thread. (goes in about 3 threads, then gronk on it for a good seal)
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Nut

Post by Mark » Sat Mar 13, 2004 2:07 am

The Dynajet I have is a 9 mm thread and a nut. The nut is screwed on the spark plug after you insert the plug into the hole in the combustion chamber, no welding is really needed. Just a tiny wrench inside the combustion chamber to hold the nut steady as you tighten the spark plug with another wrench outside.
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Re: 50mm kazoo progress

Post by Mark » Sat Mar 13, 2004 2:09 am

Mike Everman wrote:Progress on 50mm shorty Kazoo, haven't flared the intake yet. The squash didn't go too well, tooling was off and took the exhaust too far, tried to open it up, but couldn't get the section nearest the cc to open. I'll try it anyway, since it's all voodoo!
Nice shiney photos Mike. Rather sassy looking. Quite nice I'd say.
Mark

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Post by Raymond G » Sat Mar 13, 2004 2:30 am

The Dynajet I have is a 9 mm thread and a nut. The nut is screwed on the spark plug after you insert the plug into the hole in the combustion chamber, no welding is really needed. Just a tiny wrench inside the combustion chamber to hold the nut steady as you tighten the spark plug with another wrench outside.
Mark
Thanks Mark. Nice and simple. That's why I didn't think of it! What do you use for a power source to drive the plug?

Regards,
Raymond

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Post by Mark » Sat Mar 13, 2004 3:22 am

http://www.old-engine.com/magbuz.htm

This is what I have been using lately. A magnetic field develops which pulls the contacts apart breaking the circuit and the contacts touch again etc. They are expensive new, $55.00, but seem to last, I've run mine steady for ten minutes at a time while experimenting.
It's a good spark and quite zippy, I just shocked myself a few days ago not paying attention. The spark is hot enough to light paper but it won't kill you which is kind of a plus. The gas grill sparkers, piezo or gas grill capacitor discharge are ok for some things, but require the fuel/air mixture to be more perfect.
I use to have a half million volt stun gun before I broke it and recently I bought one of these. http://cgi.aol.ebay.com/ws/eBayISAPI.dl ... gory=32720
Niether this scary looking spark nor a gas grill capacitor discharge sparker or a piezo sparker or a big momma stun gun will light tissue paper or paper towels no matter how long you hold a piece of paper inbetween the spark. The buzz coil will though. It has been around for over a century, simple and still an excellent choice for driving a spark plug.
Any sparker will light paper if you spray alcohol on it first though. If your mixture is right, any spark will do, but I have found this is not always the case inside a pulsejet. I do like the simplicity of the piezo sparker though. I have a propane torch that goes full grease on and piezo sparks starts the flame all with a single click of a buttom, the fuel comes on and the spark lights it with a single motion. I have started my Dynajet with a piezo sparker and also using the single AAA battery powered gas grill sparker but it is a pain and nearly impossible from what I have experienced. Maybe drier air and the right ambient temperature would help too, but ideally I wouldn't recommend using weenie sparkers if you don't have to, just as I wouldn't recommend lethal voltages, the extra energy will melt or foul your plugs anyway.
I love my piezo for launching 3 liter plastic Coke bottles filled with a single squirt/puff/spray of methanol though. Put a small hole in the lid and it will leap down range faster than your eye can follow. Each spark system has its plus and negative side.
Mark

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Post by Mike Everman » Sat Mar 13, 2004 7:36 am

A little more progress tonight...
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Post by Mike Everman » Sat Mar 13, 2004 7:41 am

And more, and thanks Raymond for reminding me that this is the weld-LESS pulsejet, and that screwing things in is just fine. Going to have to wiretie the sparkplug to keep it from coming out due to vibration, which it did on the 75mm.
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Post by Mike Everman » Sat Mar 13, 2004 7:45 am

resosys wrote:Yeah! A little fatboy.

I agree with Viv, keep it up.

When do we get the rough edit of the "Make a Pulsejet with your car" Instructional Video Series?
I forgot to say, it's coming Chris. The forklift extensions are too long for smashing the 50mm proper, so it's a timber rig next, with car JACK, at least. ;-P I, like most of us I'm sure do not have a hydraulic press at my house.
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Post by Mark » Sat Mar 13, 2004 1:54 pm

More good pictures Mike!
Mark

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