Jet Kart powered by an Air Research TurboJet Converted JFS100-13A (7)

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14/07/2006 - Latest

I tried starting the turbine after replacing the brushes, but to no avail. The commutator segments have basically disintegrated so the starter has now officially failed for good. On the bright side I still had the option of air start using my paintball scuba air tank. After spending yet a few more pounds on hoses and a solenoid valve the engine appears to be running sweet. This is not as I really wanted it but at least it runs again, its a pain to get the tank refilled every 5-6 starts.


This shows the air solenoid valve and quick release coupling. The wiring for the starter will stay in place for the meantime, just in case the starter can be repaired or a replacement can be found.

A picture of the diving bottle that I use for paintballing. The air start seems to be a kinder way for the engine to spin up at the cost of getting the bottle recharged regularly, which is a pain as I do not own a suitable air compressor.

This is more like it, I decided that I should stop penny pinching and buy a proper fan powered oil cooler. The image shows it mounted nicely out of sight under where the engine sits. As a note it has been wired so that the fan is pulling air, rather than pushing it.

 
An overview of the governor assembly. Whilst the starter is away for a 'fingers crossed' repair, I decided that maybe I better spend my time trying to make a throttle assembly. This is done by replacing the governor adjustment screw with a plunger.
With the governor case removed the fly weights can bee seen. The fly weights control the RPM using centrifugal forces that slide the central hub up and down over a series of fuel feed holes, thus controlling the RPM.

 
The spring that normally maintains the equilibrium of 100% throttle.
The fly weights, hub and bearing removed.

 
The original plunger that is used to set the spring tension with the fly weights.
Start of the throttle assembly, the aluminum block nearest the camera has the max throttle adjustment screw mounted in it.
   

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