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  #76  
Old 05-30-2004, 09:48 PM
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John Slade John Slade is offline
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>Do you have a big tree you could nose up to?
No, but even if I did, I wouldn't want to. I'd crush the nose.
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  #77  
Old 05-30-2004, 11:00 PM
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tnt tnt is offline
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Quote:
Originally Posted by John Slade
>Do you have a big tree you could nose up to?
No, but even if I did, I wouldn't want to. I'd crush the nose.
Sorry, I omitted the sarcastic smiley face.
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  #78  
Old 07-08-2004, 10:29 AM
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Dust Dust is offline
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OK, this is in reply to sladers turbo making his plane a "hanger queen". I came to the forums really worried about a turbo converting my plane to a hanger queen and have had many lengthly conversations, mostly on this and the previous forums about the subject.

I have been convinced that a properly installed turbo is bullet proof.

Three problems can occur

oil coking on bearing

lack of oil

over revving / cavitating

lack of oil = scored shaft
cavitating = grenade

to me what happened appears to be item 1 oil baking on bearing after shutdown or item 2 lack of oil, now each time you run the engine the turbo gets hot and when you turn off the engine in this condition you can get oil coked on the bearing. at the next start up, this coking is flushed and the shaft is scored. I think this is happening to john.

I am going to install an oil pump that will run for 5 miniutes after shut down to prevent this
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  #79  
Old 07-08-2004, 01:59 PM
Flying_Dutchman Flying_Dutchman is offline
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If it is a matter of coking of the oil, it should happen in a car as well, if the engine is stopped after a good ride on the "Autobahn", and that does not occur as far as I know.

Ron Breukers
aka Flying Dutchman
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  #80  
Old 07-08-2004, 02:08 PM
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John Slade John Slade is offline
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Quote:
slades turbo making his plane a "hanger queen".
It's not a hagar queen. It's simply down for maintenace. Sure the turbo adds complexity and additional testing / failure modes. Once I get through this my bird with rarely see a hangar. People following me should be able to just bolt on whatever I end up with.

Quote:
I have been convinced that a properly installed turbo is bullet proof.
Go get your money back. Tis not so. A properly configured turbo, perhaps, but a good installation of the wrong turbo on the wrong application isnt.

I'm sure the turbo is getting plent of oil. I know this because it spat out 4 qts of oil through the collapsed bearings in 30 minutes. The problem here is nothing to do with lubrication or coking. It's over revving and continuous boost on a turbo thats not designed to handle it.

I really think the modifications I'm having done will solve the problem.
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  #81  
Old 07-08-2004, 02:24 PM
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LargePrime LargePrime is offline
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I suggest we post about johns specific case in johns thread, only because i just posted there and want to see a discusion in one place insted of two.
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  #82  
Old 04-08-2005, 02:57 AM
martinkh martinkh is offline
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Quote:
Originally Posted by Dust
No4 said

...I also did another thing that is not good airmanship, a black box from will put my nose gear down below 90 knots, if i forget.
I had been thinking a flashing red light if the airbrake is deployed and the wheel is not locked in place (as determined by a proximity switch).
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