Modifying the HK pulsejet for RC planes so that it would actually run was pretty simple but the absolutely awful quality welding that I mentioned in my review soon came into play and the engine split right along the weld-line where someone had been way-too busy with a grinder.
If you find your HK pulsejet won't do much more than pop and bang then you can try drilling out the fuel metering jet to 1mm from its standard 0.9mm diameter.
In colder weather, the HK pulsejet (like all pulsejets) benefits from a little pre-heating of the combustion chamber to improve fuel vaporization during the starting process.
The next step will be to repair this engine by welding up the crack but this may require a new strip of stainless to be formed and welded into place because the metal around the crack has been ground so think that any attempt to weld it would probably fail.
Stay tuned... some welding and fettling coming up soon as I repair the engine (again) and fit it to the Mini Talon.
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