Instagram Pic of the Week

Spark Torch Igniter Update

I have been working on getting my igniter back up and going since¬†my hiatus over the summer period. This has involved coming up a way to have removable but accurate orifices for the propellant injection. It took a while, but I found that a Lenox Laser 1/4-28 SS set screw is a perfect size to thread inside a 1/8 BSP nipple. I went for the optically measured option as this was the cheapest of which has a tolerance of 5% at 100+¬Ķm, more than good enough for this application.


My other bug to fix is that I was burning the electrode out of the spark plug, my injection holes are too close to it, so I will fix this by spacing the plug out a bit with more copper washers. Ultimately this will need to be addressed in version 2, of which I have a rough design nutted out and will start drawing up for printing later in the year.

(On a side note and abit of a plug, I am selling some SS tube which was intended for tanks, find them here.)

Instagram Pic of the Week

3D Printed Igniter Test

Over the last year I have been working on a 3D printed spark torch igniter, this has been a little side project while at university and eventually the experience gained will lead to this or a similar igniter used to light the main chamber of my rocket engine.

Yesterday I achieved the first hot fire tests of the igniter, the final test is shown below.

I ran through three hot fire tests, tuning it a bit each go. As can be seen, it is currently running oxygen-rich whereas it was designed to run fuel rich, the flame is too blue.

The design chamber pressure is 70 PSI, in this test it is ~85 PSI, so still some tuning of the inlet pressures required.
Before this test I had to replace a solenoid with another I had that has a smaller orifice than the fuel orifice on the igniter, although there is only 0.1mm difference this could slightly affect the performance. In the future, I will implement different sized orifice fittings to help fine tune it as I am not 100% on the size of the 3D printed orifices in the chamber.

You can read more about the project here.

Interstellar Technologies Ignition System Development

Video Caption: Sep-Aug/2016
Development of Ignition system for liquid rocket engine using small hybrid rocket engine.
paraffine or acrylic resin / GOX hybrid rocket
Interstellar Technologies Inc.
Taiki-cho, Hokkaido, Japan

Make Your Own Igniter

[Update: Click here to see my most recent attempts at an igniter!]

As this site is supposed to be amateur/experimental activities, I thought I would highlight some projects and components that would be of help to others in the area.

Igniter V3 (Credit: Graham Sortino)

The first thing I will highlight is, how to make your own igniter for your liquid rocket engine project.

Continue reading “Make Your Own Igniter”

Instagram Pic of the Week

This weeks pic goes to Project Earendel. (Unfortuanely no longer on the net)

View this post on Instagram

One more igniter test pic.

A post shared by Lloyd (@projectearendel) on