Jetcat Titan NGV
#6
RE: Jetcat Titan NGV
If it did turn up in the first hour of run it's no problem if it did in the 49'th hour it is a problem... Never fun to run with broken parts even though they might be perfectly fine in terms of performance.
#7
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RE: Jetcat Titan NGV
I sent a P120 to Jetcat last winter for service. This was the first service and the total run time was just under (50) hours. It was performing well with no issues but I figured that a bearing change would probably be in order. When it was disassembled the NGV was also cracked. I guess I got lucky!
Al
Al
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RE: Jetcat Titan NGV
The casting in this case is actually holding up well in the sense that the stress caused by the welded on SS ring places extreme stress under temperature gradients. It would have been bad if the vanes itself were cracking.
The issue is ill conceived engineering by welding onto a casting using dissimilar metals. Another issue as a result would be turbine rubbing when running small tip clearances.
Andre
The issue is ill conceived engineering by welding onto a casting using dissimilar metals. Another issue as a result would be turbine rubbing when running small tip clearances.
Andre
#10
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RE: Jetcat Titan NGV
It doesn't show up well in the pictures but the crack is propagating in several different directions. Stop drilling won't help. I'm going to try to TIG weld it but that's going to be iffy at best.
Anybody got a useable one out there for me (please!)?
Anybody got a useable one out there for me (please!)?
#12
RE: Jetcat Titan NGV
I don't know how well it would match the turbine wheel, but maybe an unmachined ngv from D.Albisser can be adapted to your engine?
http://jetmax.ch/leitsysteme.htm
Lars
http://jetmax.ch/leitsysteme.htm
Lars
#13
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RE: Jetcat Titan NGV
ORIGINAL: josecilurzo
Dont do it, very dangerous, high : temp, rpm, stress of exposure.
Jose
Dont do it, very dangerous, high : temp, rpm, stress of exposure.
Jose
You know what's funny is that all this would be unnecessary if Jetcat USA would just sell me an NGV!
#14
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RE: Jetcat Titan NGV
ORIGINAL: mitchilito
That's one perspective. Another is that after this TIG weld repair/anneal job we did today the NGV will be fine for at least 5 or 10 more hours.
You know what's funny is that all this would be unnecessary if Jetcat USA would just sell me an NGV!
ORIGINAL: josecilurzo
Dont do it, very dangerous, high : temp, rpm, stress of exposure.
Jose
Dont do it, very dangerous, high : temp, rpm, stress of exposure.
Jose
You know what's funny is that all this would be unnecessary if Jetcat USA would just sell me an NGV!
jackjet
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RE: Jetcat Titan NGV
You can take apart your Jet Cat, change the bearings, change the NGV,put it back together and run it without balancing the rotor assembly? Isn't that a bit risky?
#18
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RE: Jetcat Titan NGV
ORIGINAL: GhostRider 1
You can take apart your Jet Cat, change the bearings, change the NGV, put it back together and run it without balancing the rotor assembly? Isn't that a bit risky?
You can take apart your Jet Cat, change the bearings, change the NGV, put it back together and run it without balancing the rotor assembly? Isn't that a bit risky?
As for not balancing, if the engine is reassembled EXACTLY like it came apart, with all the same parts (except bearings of course) it will not require rebalancing. After my rebuild it runs as smooth as ever.
#19
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RE: Jetcat Titan NGV
ORIGINAL: mitchilito
I don't think I would recommend this course of action for everyone. However, since I have an A&P license and have spent a large part of my career overhauling and testing jet engines it just seems like business as usual.
As for not balancing, if the engine is reassembled EXACTLY like it came apart, with all the same parts (except bearings of course) it will not require rebalancing. After my rebuild it runs as smooth as ever.
ORIGINAL: GhostRider 1
You can take apart your Jet Cat, change the bearings, change the NGV, put it back together and run it without balancing the rotor assembly? Isn't that a bit risky?
You can take apart your Jet Cat, change the bearings, change the NGV, put it back together and run it without balancing the rotor assembly? Isn't that a bit risky?
As for not balancing, if the engine is reassembled EXACTLY like it came apart, with all the same parts (except bearings of course) it will not require rebalancing. After my rebuild it runs as smooth as ever.
This youtube video show a full tear down and reassemble without balancing and its still running today.
http://www.youtube.com/watch?v=yeOt4z3rtio
http://www.youtube.com/watch?v=YjPL_The0Xc