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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Mon Aug 10, 2009 4:13 am Post subject: Need advice on insturments/912's and Coolant Issues |
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> Always wondered about this, if you lose the coolant you've automatically
just spent 20k?
| Quote: | I guess if you shut down quick enough before anything goes into the red
you're ok, but if you continue on even at reduced power you just hit TBO?
I know the 912 is designed to be able to keep running at reduced power
after losing coolant (had to for the certificated versions to get their
certificates I'm told), but I'm curious if the engine is reusable
afterwards?
LS
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Lucien:
I don't know about a Titan, but I think a 912 powered Kolb could do it. 
Ever notice how quickly CHT and engine oil temps drop once power is reduced
below 5000 rpm cruise.
4000 rpm generates very little heat, and my Kolb will fly comfortably at
3,500, and on the edge at 3,000.
Unless I had a good forced landing area I knew I could make, I'd never shut
the engine down if I blew a radiator hose, or lost coolant some other way.
The critical component in this situation is the cylinder head. If the head
is overtemped for a certain period of time and temp it is trash. I'd have
to dig out the book to refresh my memory. If it is overtemped, it has to be
tested for hardness, IIRC from 912 school.
Eric Tucker said Rotax tested a 912, don't know if it was a UL or a ULS, for
two hours without coolant. Result was no damage to the engine. I do not
know what the test parameters were. However, this always stuck in my mind
and I would not hesitate to continue running the engine if I did lose
coolant, whether it ruined the engine or not, if I was over hostile terrain.
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Mon Aug 10, 2009 6:35 am Post subject: Re: Need advice on insturments/912's and Coolant Issues |
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| John Hauck wrote: |
Lucien:
I don't know about a Titan, but I think a 912 powered Kolb could do it.
Ever notice how quickly CHT and engine oil temps drop once power is reduced
below 5000 rpm cruise.
4000 rpm generates very little heat, and my Kolb will fly comfortably at
3,500, and on the edge at 3,000.
Unless I had a good forced landing area I knew I could make, I'd never shut
the engine down if I blew a radiator hose, or lost coolant some other way.
The critical component in this situation is the cylinder head. If the head
is overtemped for a certain period of time and temp it is trash. I'd have
to dig out the book to refresh my memory. If it is overtemped, it has to be
tested for hardness, IIRC from 912 school.
Eric Tucker said Rotax tested a 912, don't know if it was a UL or a ULS, for
two hours without coolant. Result was no damage to the engine. I do not
know what the test parameters were. However, this always stuck in my mind
and I would not hesitate to continue running the engine if I did lose
coolant, whether it ruined the engine or not, if I was over hostile terrain.
john h
mkIII |
I've done a couple test flights at low speeds in preperation for me and Dennis to fly together and IIRC I think 70mph with no flaps required around 4000 rpm? Something like that. I think I could keep it above stall and maintain alt at 3500, next time I'm up Ill check.
I havn't tried this with the powerfin yet which is slightly more efficient at lower speeds.
But that sounds like I could go for quite a while in slow flight w/o coolant.
Either way I'm with you, I don't care if I burn it up, I'm going to do whatever I have to to land safely.
Also, yes this motor cools off dramatically below 5000 so yeah I guess they all do. In fact, on really cold days I've had trouble getting the oil temp above 160 basically causing me to abort the flight. And I have the thermostat that shuts the oil cooler slap off below 180. Tape on the radiator should bring the CHT's up which should in turn get the oil temps up into the green. Going to work on that a little harder this winter than last.
Can't wait till fall, only a month or two away....
LS
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_________________
LS
Titan II SS
Last edited by lucien on Mon Aug 10, 2009 6:36 am; edited 1 time in total |
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Mon Aug 10, 2009 6:35 am Post subject: Re: Need advice on insturments/912's and Coolant Issues |
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| John Hauck wrote: |
However, this always stuck in my mind
and I would not hesitate to continue running the engine if I did lose
coolant, whether it ruined the engine or not, if I was over hostile terrain.
john h
mkIII |
You mean places like this 
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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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