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dosmythe(at)cox.net Guest
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Posted: Sun May 28, 2006 4:07 am Post subject: 582 Cooling |
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http://www.tsb.gc.ca/en/reports/air/1994/a94q0003/a94q0003.asp
Here is an interesting write up of a 582 crash that I've never read =
before. It talks about excessive cooling due to an installed bigger =
radiator and cold OAT's. Also talks about the 11 degree "Rotax" spec of =
the input/output temp differential's that nobody ever talks about much. =
When I did my latest mods, I temporarily hooked up my two CHT probes to =
the aluminum tubes for the input/output of the radiator and insulated =
them. Now when flying, I can observe the difference of the =
input/output. I didn't get too much testing on this but did find that =
the 11 degree tolerance is getting pushed to the limit. The use of the =
dual radiator vanes does make a difference in these temps.
Just a thought
Don Smythe
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Clem Nichols
Joined: 10 Jan 2006 Posts: 88 Location: Munfordville, Ky
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Posted: Sun May 28, 2006 5:43 am Post subject: 582 Cooling |
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Don:
Excellent posting.
Clem Nichols
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dave(at)cfisher.com Guest
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Posted: Sun May 28, 2006 7:21 am Post subject: 582 Cooling |
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Hi Don,
I have read that one before. So what is the moral of story do you figure?
I know one thing 180 F is better than 140 in cruise.
Once i get over 10k ASL under full power it hard to maintain much over
140F .
The Blue head 582 has a bypass which might keep the engine warmer and not
subject to the sudden rush of cool coolant that comes from the rad when the
thermostat opens at 136F . I do think that most thermostats in 582s are
about 135 F so watch you gauge onstart up and you will see it go to that
area then thermostat opens and it drops to say 125 to 130 then goes up
again. I find it will do this several times on warm up. Hopefully this
gives us an indication that the gauge is fairly accuarete at that level.
Cold Seizures are bad news and alot of them can be prevented by education of
the cooliong system.
Dave
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dosmythe(at)cox.net Guest
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Posted: Sun May 28, 2006 8:20 am Post subject: 582 Cooling |
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Dave,
I think the moral of the story is to design a cooling system that will
operate at a constant 165 degrees (< 11 deg differential) in all weather
and flight conditions. I might add that all things are possible.
Don Smythe
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