Jet Kart powered by an Air Research TurboJet Converted JFS100-13A (5)

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The Oil Cooler has now been fitted, which has been mounted with Mini Cooper shock mounts to reduce fatigue on the fragile matrix. I have at this stage some small doubts about whether the cooler is large enough for the job, this will be something that I will check later.

After a bit of consultation/ advice with Dino, I have decided to take the oil from the magnetic debris pick up port, then to the filter/ oil pump, on to the oil cooler and back in to the gearbox via the port where the gauze filter originally was fitted (as shown).

Hmm I hear you say. Hmm I say myself. At least it will let me run the engine a little longer than 5 minutes. I feel a more substantial fan system will need to be found, it seemed a good idea at the time. The Fans switch on when the oil pump is activated.

 
I made the battery holder today which is a pretty much a universal design. The 2 heavy duty wires at the front give me 24volts for starting, the small fused wire at the rear left gives me 12volts. The quick release connector on the right is for easy charging or connecting to Molly which will save the Kart's battery's when starting.

The Tacho has now been fitted and this makes the control panel complete (for now anyway). I have configured the readout to display 'percent' rather than Hz. At a later stage a EGT gauge may be added along with a volt meter.

  View of the magnetic pickup.
A FOD guard has been fitted which was made from a flour sive which cost 99p from Charlie's in Shrewsbury, What a bargain!

 
Whilst waiting for the nozzle to be fabricated I thought I would see how much thrust the JFS produces without it. After the unfortunate hot start it can be seen to produce about 35Lbs of thrust.
To view the video Click Here.

Today I fitted the nozzle which as always, was fabricated by my mate Tim. As you can see by the blueing I had a sneaky test run. The thrust was impressive, but I do feel more can be had. Time to get my thinking cap on for a nozzle re-design.

 
The idea was to try to make the gas flow as smooth as possible when it leaves the turbine wheel. With this design there are no sharp edges as the curve of the turbine stator make for a steep but fairly efficient gas flow. I'm sure this design can be improved on by reducing the jet pipe to the same diameter of the outer edge of the turbine wheel.


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