|
My
KJ66 Photos and build
details
|
the KJ66 jet engine info
centrifugal compressor, axial turbine, annual combustion chamber which has 6 fuel vaporising sticks face the the front of the combustion chamber from the rear, the engine runs on parafin/kerosene or white spirit, the bearings are lubricated with 2 stroke oil which is mixed in with the fuel at 5 to 8 % some of this fuel is chaneled to the bearings from the same pipe that feeds the fuel injectors, engine starting is by electric motor, air or blower start, the fuel is ignited by propane gas, this gas is injected into the combustion chamber via a pipe, this gas is ignited by either a glow plug in the combustion chamber or a cigarette lighter held at the exhaust, this gas acts as a pilot light in the combustion chamber that preheats the fuel vaporisation sticks so that when liquid fuel enters the combustion chamber it is prevaporised.
idle RPM 30,000rpm max RPM between 100,000 and 115,000 RPM
I started building my KJ66 around october 98, it had its first run on 2nd october 99, it was started using an electric motor from a R/C buggy to spool the engine up to start speed, it started and self sustained on the very first attempt, for some time the engine ran hot this was down to restrictions in the NGV, i removed material from the leading and trailing edges of the NGV blades to give it more see-through, I have changed my engine slightly from plan with the following: the NGV has a step in it the oil pipes are as per plan except there is an extra pipe that goes between the shaft tunnel and the diffuser so that the front of the front bearing gets extra oil. There is a T-piece in the fuel line, some of the fuel/oil goes to a restrictor before being fed to the oil injectors. fuel used is parrafin with about 8% (cheapest you can buy) two stroke oil. the fuel injection pipes direct the fuel onto the sides of the burner tubes and the swirl inducers on the side of the combustion chamber outer are as close to the burner tubes as possible, the injection pipes are 14mm long from main fuel ring SPENT TO DATE: the following were bought ready to go from Microjet Engineering, there is a link to their site in the links page. Front cover £25 Compressor KKK2201 £60 Diffuser £110 Combustion chamber sheet £26 608 bearings £7 preload spring £2.50 turbine £130 NGV laser cut strips £46 hyperdermic pipe for fuel injectors £3 gas can found on a road side Shaft tunnel HE30 £6 machined by a friend Shaft and nuts £70 GTBA member TOTAL: less than £500
if you require ready built parts there are a few people selling ready made parts other than the designers of the kj66 , these are Wren turbines for cast NGV and turbine wheels, and ABC microturbines
march 2001 engine is sold! i have my new engine.....Phoenix MK4, 26LBs thrust........then a year later a phoenix panther.......then Condor.....then JPX T240.....shortly going to get another KJ66! I'M BLOODY JET MAD!
| my kj66 is running at idle speed here, the twiddly thing at the top of the picture is the oil restrictor, next to that the photo shows the engine directly from the back with no exhaust nozzle, the combustion flame can be seen inside the engine, as the engine is at idle the flame is yellow, if you combustion chamber is correct then it should be blue inside there when the engine revs increase. |
| My KJ66 from the back and back without exhaust nozzle. |
|
this is the combustion
chamber that the KJ66 uses, this is from Barrie kings engine., Barrie
is now building a MW54 engine. next to that: THE ROTOR: from left to right, KJ66 Turbine, shaft tunnel with oil pipes, diffuser and compressor, again this is Barrie holding these parts from his engine. |
| a simple diagram that
shows the oil pipe arrangment that i have used, this has now been changed, the oil pipe goes to the front of the front bearing only and doesn't need to be fed to the back of the front bearing (if that reads funny, you should try tyoing it LOL), the rear bearing oil pipe is still in the same position |
| How do i start it
other than using an electric motor? i use this. it is a interior fan blower from a MG metro, cost £6.00 from a scrap dealer. (i offered £6.00 and he took it) i have adapted a nozzle on the end using a drinks bottle, the whole thing works a treat when connected to 24Volts and gives a cool and very quick startup. the on/off switch is a 15amp micro switch from a microwave oven! the same one i stole the transformer from to make a spot welder, this too works a treat. Thanks go to uncle Ralph for the thick piece of copper rod which was used as the electrodes for said spot welder. Please note the bar-b-que test stand, it makes a good stand, just don't run the engine above half throttle else it might do a runner, mind you, it would be a fun party trick at bar-b-ques.......maybe not. |
| these 7 photos show my friend Clive Longstaff's engine, again a kj66 but looking like it has been built to a high standard, the front cover has a resin front |
