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02-26-2019, 12:09 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
Originally Posted by rocketbob
I doubt many people are out flying in RV's at -40F.
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Not a materials scientist, but that seems to put it about the viscosity of ketchup, per Wikipedia  .
Doesn't seem like that'd be much of an issue even IF one were flying around at -40F.
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02-26-2019, 12:14 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Quote:
Originally Posted by RV7A Flyer
Not a materials scientist, but that seems to put it about the viscosity of ketchup, per Wikipedia  .
Doesn't seem like that'd be much of an issue even IF one were flying around at -40F.
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lol perhaps filling a brake system up with ketchup is in order to do a proper test. We can't have experimental planes with any sort of defect on the fringes of reality flying around.
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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02-26-2019, 12:19 PM
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Join Date: Jul 2013
Location: US
Posts: 2,251
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Quote:
Originally Posted by rocketbob
lol perhaps filling a brake system up with ketchup is in order to do a proper test. We can't have experimental planes with any sort of defect on the fringes of reality flying around.
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Well, while you're at it, might as well try to find the flashpoint of ketchup, too! Wouldn't want those ketchup-filled brake lines catching on fire 
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02-26-2019, 12:23 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Quote:
Originally Posted by RV7A Flyer
Well, while you're at it, might as well try to find the flashpoint of ketchup, too! Wouldn't want those ketchup-filled brake lines catching on fire 
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Especially at -40F.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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02-26-2019, 08:32 PM
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Join Date: Aug 2006
Posts: 703
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Quote:
Originally Posted by rv7charlie
Mobil ATF is synthetic. Just guessing, but it will almost certainly have a much higher flashpoint than traditional ATF, and will likely retain its other needed characteristics at a higher temp, too.
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I don't know about that. The link posted shows Mobile ATF has a flashpoint of 356 f.
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RV 7
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02-26-2019, 09:19 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Last edited by rv7charlie : 02-26-2019 at 09:48 PM.
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02-26-2019, 09:35 PM
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Join Date: Oct 2006
Location: torrance, ca
Posts: 650
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Quote:
Originally Posted by Robertc
Best I can tell looking at Mobil?s ATF spec that it?s about 32 times higher viscosity at -40 deg than 5606A.
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And yet cars in Alaska still have operational automatic transmissions in winter.
My flying-for-11 years -6 needed a 5606 flush when I noticed that the fluid in the plastic hoses had turned into jello when I added passenger master cylinders. Even with that 'goo' in the lines, the brakes still functioned just fine, and with no dragging when released. I now have flushing the brake system as a triennial maintenance item.
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02-27-2019, 03:49 AM
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Join Date: Nov 2006
Location: Walterboro SC
Posts: 153
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Does anyone know if the ATF turns into sticky goo when it evaporates like 5606 does?
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Jim Poe
RV9 First Flight 2/23/09
s/n 91416
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