§ 23.969 Fuel tank expansion space.
Each fuel tank must have an expansion space of not less than
two percent of the tank capacity, unless the tank vent
discharges clear of the airplane (in which case no expansion
space is required). It must be impossible to fill the
expansion space inadvertently with the airplane in the
normal ground attitude.

"Nomen Nescio" wrote in message
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| From: Jose
|
| If a tank is completely topped off in the cool evening
air, how much gas
| will pour overboard when the wing heats up in the noonday
sun?
|
| I know - "it depends". Let's take as an example a
cherokee 24 gallon
| wing, 45 degrees at night, 80 degrees under hot spring
sun. Or
| something similar. Could one lose more than a gallon per
tank?
|
| A quick look at the Marks' Mechanical Engineers Handbook
puts
| the coefficient of expansion at about .0007.
| So I'd tend to say no.
| You're probably looking at a little over a half gallon.
|
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