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  #61  
Old 02-26-2019, 12:09 PM
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RV7A Flyer RV7A Flyer is offline
 
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Originally Posted by rocketbob View Post
I doubt many people are out flying in RV's at -40F.
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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  #62  
Old 02-26-2019, 12:14 PM
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Originally Posted by RV7A Flyer View Post
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.
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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  #63  
Old 02-26-2019, 12:19 PM
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Originally Posted by rocketbob View Post
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.
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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  #64  
Old 02-26-2019, 12:23 PM
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Originally Posted by RV7A Flyer View Post
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
Especially at -40F.
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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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  #65  
Old 02-26-2019, 08:32 PM
Charles in SC Charles in SC is offline
 
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Originally Posted by rv7charlie View Post
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.
I don't know about that. The link posted shows Mobile ATF has a flashpoint of 356 f.
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  #66  
Old 02-26-2019, 09:19 PM
rv7charlie rv7charlie is offline
 
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5606:
https://www.noe.jxtg-group.co.jp/eng...4021-1704e.pdf
and traditional ATF:
https://www.acdelco.com.au/pdf/speci...s_dexronVI.pdf

vs Mobil 1 synthetic ATF:
https://mobiloil.com/en/automatic-tr.../synthetic-atf

Last edited by rv7charlie : 02-26-2019 at 09:48 PM.
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  #67  
Old 02-26-2019, 09:35 PM
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Originally Posted by Robertc View Post
Best I can tell looking at Mobil?s ATF spec that it?s about 32 times higher viscosity at -40 deg than 5606A.
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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  #68  
Old 02-27-2019, 03:49 AM
170 driver 170 driver is offline
 
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Does anyone know if the ATF turns into sticky goo when it evaporates like 5606 does?
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