(by Kerry Garrison courtesy of WildRocketry.Com)
Peter Riddel at Space Modeling Solutions in Arizona
recently told me about a new igniter kit called IgniterMan. This kit lays
claim to use just about any kind of wire and still be more reliable than
anything else out there. That is a mighty big claim to make so I had to
try these out. I ordered a kit from Peter and awaited it's arrival. The
kit came in two days later and I couldn't wait to kick out a few igniters
as I had a monthly club launch coming up.
Fig 1. Supplied Parts
Fig 3. Different Size Igniters
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The kit comes in four sealed
plastic vials. You start by mixing the powdered oxidizer into the pyrogen
mixture. As soon as you have that mixed up, you are ready to start. To
begin with, take some two-pair wire and strip off about 1/4" of insulation.
You should have a spark plug gaper handy to help get the cap down to under
.025". Basically, you want them as close as possible but not touching,
the closer the better. That's right, no soldering or other wire preparation,
just strip and dip.
Fig 3. Dipping the igniter
You start by dipping the wire into the conductive
primer. After a few minutes you can check the resistance to make sure it
is between 1.5 - 10 ohms. If you are over, try re-dipping the wires, usually
adding a little more primer solves the problem. Once you are satisfied
the resistance is good, you then dip the igniter into the vial of sealer.
If you are using small wires, such as wire wrap wires, and you plan on
using these to light some black powder motors, you are now done. The primer
will get hot enough to light the BP without any problem. |
If you are making
these for composite motors, you next dip the igniter into the pyrogen.
The pyrogen mixture settles quickly so you need to stir it up every few
minutes. The mix can also dry out. Since the solution is acetone based,
simply put in a few drops of acetone, stir it up and you are ready to keep
dipping. Figure 3 shows several different sized igniters as shown in the
kit's instructions. Figure 4 shows a typical igniter during each phase
of construction. |
Fig 4. Different Size Igniters
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Fig 5. Lighting an Igniter
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Ok, so the kit
is easy to use, but how does it perform? As I mentioned at the beginning,
I built these igniters to use at an upcoming launch. When we arrived at
the launch after a week of heavy rain, the wind was blowing too hard to
launch. The launch the next two weekend's were canceled. In the long run,
the pre-made igniters ended up sitting in my range box in the garage for
five weeks during extremely wet and cold temperatures.
Saturday, March 11th comes along, out to the Lucerne
Dry lake for some of the best flying conditions I have ever seen. We ended
up passing out about 25 igniters to people. One igniter had the pyrogen
break off while trying to shove it into the nozzle. On another, the pyrogen
simply didn't light. On 23 others, the results were a bit different. |
I put one into a G35 in my LOC Legacy, as soon as
the button was pushed, the rocket jumped off the pad. Next I tried a small
one in an E15 using a scratch built rocket, again the motor lit instantly.
I will let people's comments tell the rest of the
story:
I did use your igniter but it was in an I284 instead
of the J275 I thought I was going to use it in. Even better though, is
that I was drag racing Steve Todd with our Lunar Express Jr.s. He was using
a Firestarter. And the winner was..........me with the Igniterman! Yes!
- Kurt
I had a hi-rel fail prior to getting the Igniterman
from you. The Igniterman worked great and I noticed the ignition seems
"snappier". There was less of a wait after the countdown before it lit.
I'm impressed and will probably get the kit so that I can start making
my own. - Allen
Very fast to light, went off the
pad as soon as the button was pressed, a good product. a real "MUST HAVE
PRODUCT" - Colin (who used it on an H180 in a LOC Hi-Tech H45 for his
level 1 certification)
I would have preferred to try it
on a WL or BJ motor, as it would have been a more strenuous test. But the
igniter lit the motor instantly, with no hesitation at all. It was excellent.
- Joel (Scratch built rocket on an I300)
We had a good day with the exception of a couple
of igniter problems. Thanks Kerry for the Igniterman demo igniter. I'm
sold. - Allen, Bryce,Ian
There you have it, and that was just a small sampling
of the comments and experience we had with the igniters. I must say
these igniters do the job as claimed. Not only are they reliable, you can
use just about any kind of wire. The igniters built for this test included
phone wire, speaker wire, wire-wrap wire, and some unknown thing I found
in the garage. This is a killer product that does what it claims and does
it well!