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Crosswind - Vented Tanks?

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nfivesl(at)yahoo.com
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Posted: Tue Feb 21, 2006 1:41 pm Post subject: Crosswind - Vented Tanks?

Are the 701 tanks vented?  My wing tanks are vented as

shown in this 601XL drawing snippet (in bubble):

http://www.cooknwithgas.com/TankVent.jpg



Scott Laughlin 

 	  Quote: 	
		   

 JERICKSON03E(at)aol.com

 

 In a message dated 2/19/2006 12:59:52 PM Central

 Standard Time, 

 squiggles(at)yahoo.com writes:

 

 - The ZAC fuel caps require supplemental vents.

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frank.hinde(at)hp.com
Guest

Posted: Tue Feb 21, 2006 2:17 pm Post subject: Crosswind - Vented Tanks?

Yup tank vents...A quick seminar.



1) All tanks must be vented somehow (duh!)

2) Vent tanks into high pressure areas 

3) Take advantage of total (forward ram) pressure 

4) make sure vent can drain

5) don't fly in icing conditions!



All of this means sticking the vent below the wing (or fuselage) and

cutting a 45 deg angle on the end, as shown on Scott's drawing...You

don't want to use a pitot tube setup as this can collect water/ice.



If you have to stick a vent above the wing it needs to be high enough to

get out the low pressure air. If on the bottom it still should be long

enough to escape the boundary layer (about an inch I believe)



Stay below about 12k'when using autofuel unless to do a vapour pressure

check on a fuel sample....Don't want it boiling off on us do we?...



Frank



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