Do single engine planes, or lear jets, drop fuel at landing or takeoff and do the emissions drift up or down

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• The drip from the vent tube is the same as cars from the 60s and older that don't have evap control systems.

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  by That Guy Again on November 1st, 2009

• Low wing usually vented systems too.
  
  No, leaving a cap off can suck a tank dry, it's a fact and it's fluid dynamics Bernouli and Venturi stuff. In fact it's called the venturi effect and it's the same way carburetors work and how they atomize fuel for the engine.
  
  See: http://en.wikipedia.org/wiki/Bernoulli's_principle
  and
  http://en.wikipedia.org/wiki/Venturi_effect

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  by That Guy Again on November 6th, 2009

• The vent tube faces into the relative wind which actually provides a bit of positive pressure in the tank. The fuel constantly sloshes during flight and does not lay like a quiet lake becuase of gravity. Many aircraft such as the C182 and C210 use bladder tanks (your bags). Even mentioning gravity in an aircraft where thermals can give momentary '0'g experiences makes no sense at all. The area above the wing is a low pressure area unto itself. All of these inconvenient facts...
  
  Fly without fuel caps if you like but please do it over unpopulated areas and include me as a beneficiary with your insurance company.
  
  http://www.aopa.org/asf/publications/sa16.pdf
  
  You can read it in print about siphoning not being a 'wives tale' here: http://www.aopa.org/asf/publications/sa16.pdf

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  by That Guy Again on November 7th, 2009

• You only need to lose some. Fuel exhaustion accidents happen because the pilot is surprised that instead of the 5 gallon reserve in the tanks, there are fumes.

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  by That Guy Again on November 8th, 2009

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