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Post by pitciblackscotland on May 30, 2013 0:44:53 GMT -5
Hi Guys, I got this Behotec J66-HP Turbine engine last week and had a failed run test today I'm Using a servo test and attempted a calibration run and failed. Can anyone tell me what i am doing wrong manual says it is required if any thing in the fuel system has changed ( different fuel line length , new tank or fitter ect.) Which i did and as you can see in the vid she cuts out www.youtube.com/watch?v=4Vn0k3XMYQI&feature=share&list=UUhmWRMa7r3wD3OV7m0I_eOQCheers, Mark.
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Post by Richard OConnell on May 30, 2013 7:14:55 GMT -5
What fuel are you using? What temps was it showing?
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Post by turbochris on May 30, 2013 9:00:56 GMT -5
too much propane? Is your servo tester consistent?
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Post by pitciblackscotland on May 30, 2013 12:02:45 GMT -5
Hi Richard, Kerosene mix with Turbo oil 2380. The temp was about 475c then she would shut down. I can set the engine on manual which i tried and it starts up on gas and then shuts down . Chris, I'm thinking there might of been too much propane on start up I don't really know if the servo tester is consistent, i use it to run the 2650kv mamba monster motor. But i found this Turbine Engine Driver on the web www.electrodynam.com/rc/EDR-206/index.shtml Cheers, Mark.
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Post by Richard OConnell on May 30, 2013 17:57:54 GMT -5
Are you starting on 100% propane, or are you using a propane/butane mix?
Edit: I wouldnt really think it would matter. Butane only produces ~%12 more energy.
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Post by pitciblackscotland on May 31, 2013 4:48:54 GMT -5
Hi Richard, Using propane/butane mix. I went over the mamual again A 8 cell battery is recommended the capacity should be high 1600 MAH or higher. I should have a 8 cell battery and have at least 9.6 volts, the battery i have now is 2 cell 7.4 volts 2200 MAH.
Cheers, Mark..
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Post by turbochris on May 31, 2013 10:54:32 GMT -5
if you get yourself an Arduino I have a program that will run a turbine. it has a trim sw and takes 0-5 volts you could just use a potentiometer full travel. it's what I use on my turbine bike. Just hook a servo to your servo tester output and watch the servo position as you run the turbine, maybe glue a degree wheel to it. You need enough propane to heat, not to run. I have another program for the arduino that has a provision for overspeed N2 shutdown.
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Post by pitciblackscotland on Jun 2, 2013 23:19:20 GMT -5
Hi Chris, Thanks for your help but I have Bad news, I FUCK THE ENGINE UP . I got a 11.1V 2200 30c Battery and charger $54 i exchange the other charger i got from them so the cost wasn't to bad. i got the turbine to run on the calibration cycle i found out if i ease off on the propane a bit the engine didn't shut down. So she started up and the engine went threw it's calibration cycle once it got to 117,000 RPM it slow down and stop, the starter motor could not spin the comp wheel for cool down on the engine as the bearings are seized WTF I don't know why it seized up . I put about 55mls of turbine oil in 1 litter of kerosene, the temps was ok i think . It got up to 735c at 110,000 RPM maybe i over temp the engine but the ECU would shut the engine down .As you can see in the pics there are some type of metal deposits on the exhaust. Cheers, Mark.
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Post by racket on Jun 3, 2013 0:57:14 GMT -5
Hi Mark
With a lot of start propane there'd be less lubricant going to the bearings as its a proportion of combustor fuel flow .
Time to take a look inside :-(
Cheers John
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Post by turbochris on Jun 3, 2013 11:47:34 GMT -5
yeah go through it no point in spinning it any further. maybe someone put cheap brns in or a pipe is off inside.
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Post by pitciblackscotland on Jun 4, 2013 1:10:47 GMT -5
Hi Guys, Ok i took the combustor can off and you can see bits of propan tubes floating around inside . The bearings feel ok me thinks , so will pack it up and send off for repairs. Cheers, Mark..
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Post by pitciblackscotland on Jun 4, 2013 1:13:29 GMT -5
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Post by racket on Jun 4, 2013 1:24:43 GMT -5
Hi Mark
LOL....that alloy outer can looks a bit worse for wear ;-) .............burnt alloy accounts for those white deposits.
Sounds like the propane preheat line has been broken before you tried starting her up resulting in combustion outside the flametube ..............heh heh , I know what thats like .
Cheers John
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Post by pitciblackscotland on Jun 4, 2013 1:57:03 GMT -5
Hi John, Maybe the several attempts to start the engine and adding to much propane has weaken the propane tubes Cheers, Mark..
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Post by pitciblackscotland on Jun 6, 2013 2:04:49 GMT -5
Ok today i took the comp wheel off and cap so i can see how the inside is looks ok turbine wheel looks good . Now to look for a suitable can and get some very small dia brass tube for the gas line. Cheers, Mark.
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