|
Post by Johansson on Dec 1, 2010 10:41:06 GMT -5
I have got 6 of them from 201's to 522's. The easiest engine to work with . Is there any major difference between the models? I believe to have seen that the 500-series has its starting engine integrated and not in front of the compressor, but I might be mistaken. Could using the start up system cause a hot start? A flame inside the engine is a BITCH... Been there...Done it! I can´t see why it should, the afterburner injectors are well downstream the turbine wheel so no burning fuel can reach the wheel once air is flowing through it. How about a hot streak using a "momentary" contact switch or spring loaded switch to off? Forget the spring load switch, he might hold on to it to long and hurt the turbine. I´ll have to think about it, but there is not enough time to make this modification and I really don´t want to make any modifications of this magnitude to his engine in case something goes wrong. If it were my engine I wouldn´t hesitate a second but since I it isn´t I will keep myself to making changes downstream of the main engine. =) We tested the igniter under a hard blower but not under heavy thrust. We designed it for a easy start ignition on the J-34. Sounds good, we might just build one of these igniters for our kick engine since we had issues with afterburner ignition at high thrust levels last year. Thanks for your help!
|
|
|
Post by Johansson on Dec 4, 2010 1:21:28 GMT -5
To get back on topic (the jet kick build) I post a pic of yesterdays job, my friend has almost finished the control panel so in a few weeks he should have everything hooked up and ready to go. I bought a sheet of 1mm stainless a couple of days ago that will be used to build a better afterburner for the engine, this time I will try to do some calcs for it to keep the diameter as small as possible and use a flame holder instead of the usual "stepped" duct that uses a vortex to hold the flame. I might just try the ignitor you suggested Ernie!
|
|
|
Post by ernie wrenn on Dec 4, 2010 12:02:01 GMT -5
Jonan
If you need one let me know and I will build you one. Mail cost could not be that much.
Ernie
|
|
|
Post by turbochris on Dec 11, 2010 16:23:24 GMT -5
hi johansson, are there any boeing 553 available by you? also, why did you use thrust power on the 553 in the car? I would think it perform much better with shaft power
chris
|
|
|
Post by Johansson on Dec 12, 2010 3:30:24 GMT -5
Hi Chris!
I don´t know of any 553´s right now, there were practically giving them away 10-15 years ago when the army retired the model S-tank but now they are harder to find.
Again, this is not my car so I have had very little to say about it. I was contacted a year ago when the owner needed to have an afterburner built for it, he bought the engine already converted for thrust but with a very narrow thrust cone so I strongly suggested that he would rebuild it to avoid a meltdown.
At first he didn´t have any gauges connected so he had no idea what the temps were, but a brave (stupid...) friend of his told him after looking up the jetpipe while the engine was running that the turbine wheel was glowing cherry red...
|
|
|
Post by Johansson on Dec 31, 2010 2:06:48 GMT -5
|
|
|
Post by racket on Dec 31, 2010 15:55:58 GMT -5
Hi Anders
Oh, how embarrassing ;-) ...................heh heh , I once found a rag in the delivery tube between compressor and combustor whilst trying to find out why my bike engine wouldn't fire up .......duh , I can appreciate how you guys are feeling ..................I now try not to use rags to seal holes anymore , they can have a nasty habit of disappearing down the very hole they are trying to stop things going down.
LOL....always "good ??" to find the problem though :-)
Cheers John
|
|
|
Post by Johansson on Dec 31, 2010 16:08:31 GMT -5
Quite embarrasing, yes. But not enough to keep us from telling you about it. ;D
We are glad that we decided to build a new oil tank and not reuse the old one, then we might have missed the rag and suffered the same failure this year...
|
|
turborico
Member
Joined: December 2010
Posts: 24
|
Post by turborico on Dec 31, 2010 16:42:42 GMT -5
In the aircraft maintenance world we call that "FOD", foreign object damage. It's amazing what damage a loose rag or unaccounted washer can do, and it's never any fun.
How did this kick project start? Is it a private venture, school project, or what? It's pretty a pretty sweet rig.
|
|
|
Post by racket on Dec 31, 2010 18:14:13 GMT -5
Hi Anders LOL.......the embarrassing ones are always the most interesting because we've all made them and can relate uncomfortably very fortunate you found it .....................its lot more embarrassing/disheartening when we put the engine back together and the same thing happens again ..................how well I know When will you be firing her up next ?? Cheers John
|
|
|
Post by Richard OConnell on Dec 31, 2010 21:24:44 GMT -5
Me and ernie ended up taking a check valve out of the hearse because it had frozen closed. We fixed it, replaced it and still no fuel. We then climbed back inside to remove it (very small cramped space), got it all the way out, found out nothing was wrong with it and that we had left a quarter-turn valve off that allowed fuel to flow from the fuel tank. So yea, simple embarrasing things are nothing new.. Glad it worked out for you
|
|
|
Post by Johansson on Jan 1, 2011 5:11:19 GMT -5
How did this project start? Hmm, I have been interested in DIY gas turbines for almost 10 years now (which is a long time for a 29 year old guy) and two years ago I heard from a friend about two guys trying to build a gas turbine kick just outside town. I went over to say hello and found that they had no real idea of what they were doing (hope you won´t read this Olov... , they didin´t even know that a turbo needed oil to its bearings... I offered my assistance and we did the best we could to correct the largest mistakes before the race which were just a month or so away, we got it to start and run on diesel fuel but the crude combustor took its toll on the turbine wheel so it grinded to a halt after 30 meter at the race. ;D After that we decided to build a new jet kick and here we are two years later. The projects are 100% funded by ourselves and built in our spare time. Racket and Richard: Good to hear that we are not the only ones making embarrasing fuckups. ;D If Olov and Pål have enough time to spend on assembling it we should be ready to start it in the end of January.
|
|
turborico
Member
Joined: December 2010
Posts: 24
|
Post by turborico on Jan 1, 2011 12:03:08 GMT -5
That's awesome!
I take it that the IC engine you're using is running a pump, is it fuel or oil?
|
|
|
Post by Johansson on Jan 1, 2011 13:57:48 GMT -5
That's awesome! I take it that the IC engine you're using is running a pump, is it fuel or oil? Yup, it´s an oil pump motor.
|
|
|
Post by racket on Jan 1, 2011 16:11:29 GMT -5
Hi Anders LOL...Stuffups are the incentive to learn how to do things better , it was only after I fitted an undersized freepower to my bikes TV84 gas producer and bent the TV84's shaft from surge and wrecked all the rest of the rotative and bearings that I decided it was time I learnt some maths to do the "numbers" , it was expensive motivation, but just part of the journey :-) Anders, have you thought of using a 12/24/36 volt motor instead of the IC engine for your oilpump , they're now available up to 1 Kw at very reasonable prices , come equiped with a sprocket ........... www.electricscooterparts.com/motors.html ..............I'm using a 500W 36 V motor running on only 12 V for my test stand oilpump , pumps 10 litres/min at nil pressure but still plenty at 60psi for those "rattly" TV94 brass bushes in the 10/98 engine even at 100deg C oil temp it'll maintain 40psi , could fit a 24V controller on it so that it always maintains 60psi if run on the higher voltage . Cheers John
|
|