View Full Version : OT: Knowledgeable Aviators INSIDE!

02-17-2006, 08:37 AM
A couple of aviation related questions for you that I need help with:

Question #1:
What type of hydroplaning would occur with a water depth of 1/1000th of an inch?

I know hydroplaning has a lot to do with tire pressure, tread depth, velocity, etc etc but the question only gives water depth as a variable. First off, I think that around 25 microns of water is not enough to induce hydroplaning, but if there had to be hydroplaning, I'd say it would be rubber reversion hydroplaning since there's not enough water for dynamic hydroplaning, and since the question doesn't mention runway contamination, I'd rule out viscous hydroplaning. Can anyone confirm this?

Question #2
Arrange from coldest to warmest: Outside air temperature, total air temperature, static air temperature.

I know that total air temperature is higher than static air temperature, but where does outside air temperature fall?

Thanks in advance.

02-17-2006, 08:40 AM
It would depend on the meniscus which in turn is related to the surface area of the water in question.

02-17-2006, 08:47 AM
umm, the answer is... C?

02-17-2006, 08:56 AM

02-17-2006, 11:46 AM

C'mon guys, this means the difference between a check plus and a check minus minus in Ms. Graf's science class!

02-17-2006, 11:55 AM
Is Ms Graf hot?

Why should I want to impress her with my scientific mind? http://forums.ubi.com/images/smilies/halo.gif

02-17-2006, 11:56 AM
Blind stab in the dark but..

Static air temperature is outside temperature. Total temperature can never be measured. http://forums.ubi.com/images/smilies/touche.gif

02-17-2006, 02:58 PM
1) viscous (a thin film of moisture covers the painted areas of the runway, and the wheels slide on this)
as opposed to
- dynamic (just normal hydroplaning)
- reverted (wheels are locked and ride on burned rubber and steam of evaporating water - like a droplet on a hot plate)

2) OAT and SAT are the same thing, TAT is higher. Unless they mean that there might by a wind, in which case OAT would be higher than SAT (SAT is realative to the air, OAT to the a/c)? Dunno, stupid question http://forums.ubi.com/groupee_common/emoticons/icon_smile.gif

02-17-2006, 06:39 PM
http://forums.ubi.com/images/smilies/agreepost.gif Yeah, what he said! Erm, I think http://forums.ubi.com/images/smilies/35.gif

02-17-2006, 06:49 PM

02-17-2006, 10:22 PM
Thanks Jim!