Jet Kart powered by an Air Research TurboJet Converted JFS100-13A (8)

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I paid a visit to fellow turbine addict Lee Dennick and as it turns out he had for sale a spare reheat tube made specifically for a JFS100-13A, so a deal was done. After renewing some of the pipe fittings, purchasing a fuel boost pump from a Sierra Cosworth and a new Igniter Exciter from Avon Aero, (as if I had an unlimited source of cash) all were fitted and the time had come for a test run.

Hmm - no ignition, I had a chat with Paul and Lee and they gave me some ideas and as it turns out the fuel flow from the pump was too high resulting in a rich mix, I restricted the flow by crimping a pair of mole grips on the fuel pipe and the right mix was eventually found at around 85% RPM. Unfortunately I could not make ReHeat ignition at 100%. I replaced the mole grips with a 12volt electronic speed controller form cpc.co.uk and persisted.

Straight up the pipe. The spotters of you may notice that the flame shield is back to front, I noticed this after the first attempted test run, I then changed it to face rear, it was noticed that the Igniter Plug was in quite a sorry state, but just about still functional. Still persisting with the ReHeat.

 
S*d it. Not having a fun time. The Igniter plug has worn and come loose and the thread is barely visible so of it goes to the scrap bin. The afterburner uses so much fuel and at the moment without impressive results, so I have taken it off and I will use the original nozzle for now and have some fun before the winter sets in. I feel that the AB nozzle will need to be reduced as well. The money that these projects cost, sometimes you just have to say, enough is enough. I will try the reheat again early next year, which gives me some time and money (which is limited) for my other turbine projects.

A Vid Cap of some fuel being sent in to the afterburner on shutdown and ignited. This was done for the spectacular flame and no other purpose. It makes me feel better about the time spent on it.

This is turning out to be another Doom page. Today the throttle plunger was fitted. The throttle pulses when run at 100%, possibly due to the throttle assembly flexing and/or the plunger not being sat on the governor spring correctly, also the turbine flame outs when run below 80%; does anyone have any ideas on what's happening? I reckon one possible reason is because of the reduced revs and consequently reduced fuel pressure, there is poor atomisation of the fuel from the injectors, indicating that the injectors may need a service?
Due to the hot starts which need careful monitoring a Thermometer has now been added to the control panel as per the image above.

Today I had a test run of the Kart at an industrial estate in Shrewsbury. The power was down to 98% for the first run, but this was soon adjusted. We only had about 75 meters to get our speed up and unfortunately this wasn't enough for a thrilling ride, but none the less it was a good laugh, we reckon we made 25mph in places!. It was noted that turning corners severely reduced the kart speed due to lack of a differential on the rear axle.
Click here to see the video's.
   

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