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The Hubbrid Spark Plug

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The Hubbrid Spark Plug

Unread postAuthor: Hubb » Tue Apr 01, 2008 10:09 am

There seems to be several questions about how to place a spark in the center of a hybrid (or combustion). I did it on my hybrid launcher, without tapping into the chamber, fairly easily, and I figured I would post a how-to.

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Obtain the materials
1 - metal coathanger
1 - drill bit slightly larger than the coathanger
2 - pieces of heatshrink tubing, or electrical tape
1 - 1/2" steel pipe cap
1 - 1/2" steel pipe nipple, close
1 - JB Weld or other strong epoxy

Obtain the tools
1 - pair of needlenose pliers
1 - file or grinder
1 - lighter
1 - drill + drill bit slightly larger than the coat hanger diameter

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1: Drill two holes, side by side but not touching, in the end of the pipe cap.

2: Clip the coat hanger into two pieces, making each piece about 1 inch longer than half the chamber (if the chamber is 12" long, the pieces should be 7" long as 12 / 2 + 1 = 7).

3: Use the grinder or file to sharpen one end of each coat hanger. Use the needlenose pliers to put a loop in the opposite end.

4: Clip several 1inch pieces of heatshrink tubing.

5: Slide the heatshrink tubing over the coathanger until it hits the loop and heat it up so that it shrinks snugly against the coathanger. Repeat this process until the hanger + tubing will slide through, but fit snugly inside, the holes in the pipe cap.

6: Slide the coathangers into the holes, making sure the heatshrink tubing is touching the cap and not the wires. The pointed ends should go into the chamber.

7: Fill the cap with JB Weld no less than half full.

8: Tighten the nipple on to the cap and allow the JB Weld to dry.

9: Bend the pointed ends closer together.

10: Place it on your launcher

11: Connect the exposed (looped) ends of the coathangers to the sparking system.

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Options:
- This is designed for a hybrid launcher but can be used for any combustion type launcher.
- This is not limited to using only 1/2" steel pipe fittings.
- PVC can be used instead of steel fittings. If this is the case (and assuming a hybrid is not being built), the heatshrink tubing is not necessary.
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Unread postAuthor: MrCrowley » Wed Sep 29, 2010 8:28 pm

Not sure why this topic never received any replies, I think it's a pretty solid alternative to spark plugs. Since I can't be bothered finding spark plugs which are close enough in thread diameter for me to re-tap a brass fitting and then epoxy it in (like I did on my first hybrid), I gave this a try. Seems to work so far.

Only thing i'm worried about is the epoxy being damaged by the combustion. I just checked the JB-Weld on my first hybrid at the spark plug and half of it has been wasted away. That's probably from about 40-50 firings. I'm using araldite this time, maybe it'll be better.
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Unread postAuthor: Lockednloaded » Wed Sep 29, 2010 8:48 pm

I made a solid JB weld plug inside a 3/4"-1/2" bushing and the spark plug method, I have fired at 5x, and it holds true, but Its only been two or three shots
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Unread postAuthor: SpudBlaster15 » Wed Sep 29, 2010 8:50 pm

MrCrowley wrote:Only thing i'm worried about is the epoxy being damaged by the combustion. I just checked the JB-Weld on my first hybrid at the spark plug and half of it has been wasted away. That's probably from about 40-50 firings. I'm using araldite this time, maybe it'll be better.


I use a similar design for hybrid spark plugs, and believe it or not, the original unit from my first hybrid is still functional today. It has held up to hundreds of firings, including oxy/fuel mixtures, and I've only had to replace the JB weld once.
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Unread postAuthor: MrCrowley » Thu Sep 30, 2010 9:26 pm

This is what mine ended up looking like:
Image

Had no heat shrink (and it's damn expensive) so I just used electricians tape.

Image
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Unread postAuthor: HACKERZLORD007 » Tue Jun 28, 2011 6:14 am

THanx a ton mate....really needed help with the spark plugs!!!!
This just solved my problem.....and a pretty good and east to understand diagram!!! :)

CHEERS
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