Courious Crash

§ 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
...
| -----BEGIN PGP SIGNED MESSAGE-----
|
| 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.
|
|
| -----BEGIN PGP SIGNATURE-----
| Version: N/A
|
|
iQCVAwUBRYem+JMoscYxZNI5AQF09QQAmrNzWVb46u3Kp+PszB zVMBUUbnoXuRgi
|
BFoBxHBILrW4E0uLNlsv9SOpqhEYDffH52OGOp3QUrzb4LPnMo pMbucqldy9QdaV
|
V5MS8hMA0e0EO7XamlvaK77Rx2lp3mos/Viot31mWwNtnzLnAxot/9imkyOctIfC
| TxaJ3pMZdBw=
| =/h7e
| -----END PGP SIGNATURE-----
|
|

§ 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.

I don't know whether cherokees have expansion space, but they do have a
fuel vent that vents fuel "clear of the airplane" (as far as I can tell).

However, I would infer from the reg that 2% would be typical of expected
expansion. So, half a gallon loss out of a 24 gallon tank would not be
outrageous.

Am I missing something?

Jose
--
"There are 3 secrets to the perfect landing. Unfortunately, nobody knows
what they are." - (mike).
for Email, make the obvious change in the address.

§ 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.

I don't know whether cherokees have expansion space, but they do have a
fuel vent that vents fuel "clear of the airplane" (as far as I can tell).

However, I would infer from the reg that 2% would be typical of expected
expansion. So, half a gallon loss out of a 24 gallon tank would not be
outrageous.

Am I missing something?

Jose
--
I suspect that it means that the expected loss is much less. They probably
wanted to ensure that no fuel is leaked inside the aircraft over the widest
expected range of temperature and a reasonable range of attidudes--such as a
flat tire and/or a sloping ramp.

Peter