REFLECTOR: Fuel venting issue

Ron Brown romott at roadrunner.com
Mon Jul 2 11:11:54 CDT 2007


The varmints - a smaller bee than mud daubers will also nest in the little bitty pitot tube holes.

Had it happen on our Cessna a few years back. No airspeed indication on take off.  It was not easy to remove and clear the opening.

Ron
  ----- Original Message ----- 
  From: Alex Balic 
  To: 'Velocity Aircraft Owners and Builders list' 
  Sent: Monday, July 02, 2007 9:42 AM
  Subject: Re: REFLECTOR: Fuel venting issue


  Well the check valve keeps the flow going just one way- into the tanks- and also in the unfortunate case of a roll over, would keep fuel from draining into the cabin as well- I am pretty sure that  it is the factory recommended setup now- the vent line goes up to the roof line inside before exiting the bottom of the aircraft just in front of the sump drain for normal operation.  I just figure that I don't want to be a glider due to one determined mud dauber ( which are really really plentiful here in Texas by the way) I have seen them build a nest in less than 30 minutes, so even a $100 ( currently $150 due to high fuel prices ) hamburger  stop could possibly be trouble.... the pito holes are probably too small for them , but that vent line would be just about right.. even the recessed screw holes on my power tools are generally  plugged up by the end of each summer- and I need to clean them out with a screw driver- kind of nuts....

   


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  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Scott Derrick
  Sent: Sunday, July 01, 2007 4:40 PM
  To: Velocity Aircraft Owners and Builders list
  Subject: Re: REFLECTOR: Fuel venting issue

   

  I have a hard time feeling good about having a fuel vent line open to the interior of the cabin...

  Scott

  Alex Balic wrote: 

The check valve is located inside the plane and above the level of the fuelin the tanks (right up at the roof- it T's into the vent system, so fi theexternal vent fails, it will open and allow air into the tanks from thecabin- but not let fuel/fumes out into the cabin. -----Original Message-----From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] OnBehalf Of David StatenSent: Sunday, July 01, 2007 12:49 PMTo: Velocity Aircraft Owners and Builders listSubject: Re: REFLECTOR: Fuel venting issue If the check valve is on the same line that is theoretically blocked by ice or mud, how is it able to prevent ANYTHING? An obstructed vent is an obstructed vent. Dave Brett Ferrell wrote:   The check valve is actually there to prevent tank collapse should the vent line become blocked (by say a mud-dauber or ice accumulation).  I've seen a 15,000 gallon steel tank collapse by a plugged vent, and it's not pretty... B Scott Derrick wrote:     Hmmm...  {snip} Just recently  I noticed a one way valve had been added to the single line running out of the block to prevent flow out of the vent line and thus only allow air to flow in.   I don't have this one way valve and wondered why I would need it?  I guess this scenario answers my question. {snip} Scott            ------------------------------------------------------------------------ _______________________________________________To change your email address, visit    http://www.tvbf.org/mailman/listinfo/reflector  Visit the gallery!  www.tvbf.org/galleryuser:pw 


--  -    I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it.     Thomas Jefferson to Archibald Stuart, 1791. ME 8:276 

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