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Post by pitciblackscotland on Feb 13, 2013 19:22:12 GMT -5
Hi John, Your not a crappy typer at all as i am not the best as well. I sent you a PM with my e mail address. Cheers, Mark..
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Post by Drastyk333 on Feb 13, 2013 21:57:01 GMT -5
Hello Mark. I will try and get a drawing together if that is what you want or at least some pictures of the cheapo sleazo lash up I use to determine weather my Garrett Turbines that I get, work.
John
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Post by Drastyk333 on Feb 13, 2013 22:00:14 GMT -5
Mark
Duh, Should have looked at your PM first,I will get some thing together for you.
John
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Post by Drastyk333 on Feb 21, 2013 4:17:02 GMT -5
Hello Mark, I saw you got my schematic,I dont know if it will help I have a GTP70-19 turbine among others,it was a real bear to figure out the electrical on it.My turbine came as a whole package,turbine,45KW generator,skid mounted.It was originally the power unit for the Sargeant Missile system.That thing had what seemed like 2000' of wiring on it going every place.It took me a month of sundays to try and track down where it all went.I cut stripped,marked every wire from where it came out of the 34 pin cannon plug to where they went to, found out 95 percent of them didnt have any thing to do with what i wanted to accomplish.So i kept the wiring intact from the female half of cannon plug and worked from there figuring out what i had to.It fired up first crank,which kind off surprised me.If I can ever figure out how to post pictures I will,but still STRUGGLING with that piece of HIGH TECH WIZARDRY...........JOHN
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Post by pitciblackscotland on Feb 21, 2013 14:36:28 GMT -5
Hi John, Yeah got your e mail, I have the GTP70-6 the electrical on it is not as complicated as your 19 engine. But i have two very rare GT engines you can see more on the General Jet and Turbine Discussion page GTC20-1 I can not find any info on this engine it might be use for a fogger . It has a 32 pin cannon plug so i will have fun finding out what wire is what. It's not hard to post pictures just click browse on the post reply page and click one picture only from you folder and that's it. Cheers, Mark. Attachments:
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Post by pitciblackscotland on Dec 10, 2014 21:55:55 GMT -5
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Post by racket on Dec 11, 2014 0:24:49 GMT -5
Hi Mark
Looks like you've blown out a heap of oil thats been sitting in the combustor , that could have come from anywhere during its handling prior to you getting it, its too much too quickly for just a seal leak .
Crank her up and get some fire in her to dry things out , but don't breath the smoke :-(
Cheers John
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Post by racket on Dec 11, 2014 15:30:31 GMT -5
Hi Mark
That "old" vid looks OK , so why would the newest vid have so much oil ??
Is there a combustor drain valve , is it blocked ??
Could the crankcase be becoming pressurised whilst sitting there between spoolup attempts and forcing oil into places where it shouldn't be .
The oil seal would be a non contact type one would imagine , so the potential for leakage whilst standing .
Theres just too much oil in that vid of your most recent spoolup attempt for it to be just the supply to the bearing leaking through a dodgy seal.
Once the engine is running one would imagine the gas pressures would force the oil back inside the seal and you'd have huge amounts of breather fumes coming out of the engine .
Do you have an exploded view of the engine ??
Cheers John
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Post by racket on Dec 11, 2014 22:35:09 GMT -5
Hi Mark
Bummer , bit of a mystery :-(
Are the combustor drain free , you may to blow them through to make sure they're not blocked.
There isn't too much oil in her ??
Cheers John
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Post by pitciblackscotland on Dec 12, 2014 22:52:26 GMT -5
Hi John, Ok have fix the oil leak problem. LOL i'm just a dumbass i found out i overfilled the engine with oil, but was reading off the oil dip stick when i should of take note of what the manual has said. This thing is very tricky to fill as you need to fill half the oil in the accessory gearbox and rest in the oil tank so you have bleed all the air out of the system, let's hope i haven't done any damage to the turbine shaft seal??? Here is the vid with some of the oil remove from the tank will check it again tomorrow but sounds a lot better than before. youtu.be/dyvE172h56w Cheers, Mark..
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Post by racket on Dec 12, 2014 23:22:07 GMT -5
Hi Mark
LOL........now thats better ;-)
Cheers John
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cobrajet
New Member
Joined: May 2015
Posts: 8
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Post by cobrajet on May 27, 2015 6:42:15 GMT -5
Any updates to your project?
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Post by pitciblackscotland on May 27, 2015 7:18:31 GMT -5
G'day, No not yet been busy with the mower project. Just need to charge up the batteries that's if they will charge up they have been sitting a while. I will get on to soon and will post updates on here.
Cheers, Mark.
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cobrajet
New Member
Joined: May 2015
Posts: 8
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Post by cobrajet on May 27, 2015 20:14:10 GMT -5
By the way, does anyone know what the lowest idle RPM is on a GTP70?
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Post by racket on May 27, 2015 22:57:15 GMT -5
Hi Max rpm seems to be ~40,000............ www.gasturbine.pwp.blueyonder.co.uk/gtp70.htm , minimum rpm would be probably a tad under half that , lets say ~17,000 , but depending on how the engine fuel system is configured , you might find it wants to maintain max rpm , with extra fuel scheduled when load is applied so as to maintain the preset rpm ............hopefully someone with more data on the engine can provide a better answer . Power output at 17,000 would be minimal as its barely got enough energy to turn itself around , being a single shaft engine most of the power is made in the last 10% of the rpm range , from ~35,000 . Cheers John
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