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US tank balance

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Mon Jun 29, 2009 7:12 pm Post subject: US tank balance

One thing I've noticed with the original dual tanks on my UltraStar is that 

they don't drain evenly.  With the plane sitting on the ground they level 

out, but in flight the left tank tends to run somewhat lower than the right 

(they're plumbed together on the inner side of the valves with the outer 

sides tee'd together at the fuel strainer).  Anybody else see this?



I presume it's due to minor variation in air pressure at the vented caps, 

which could be alleviated by poking holes in the top of the tanks and 

running a tube between to let the air balance... thoughts?



-Dana

--

  Campaigns to bearproof all garbage containers in some national parka have 

been difficult, because as one biologist put it, "There is a considerable 

overlap between the intelligence levels of the smartest bears and the 

dumbest tourists."

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h20maule(at)hotmail.com
Guest

Posted: Mon Jun 29, 2009 7:31 pm Post subject: US tank balance

mine do the same...but i think its because they are different shapes. i assume you have the same size...

Daniel

fs2 amphibian



[quote] Date: Mon C 29 Jun 2009 23:04:33 -0400

 To: kolb-list(at)matronics.com; KolbUltrastar(at)yahoogroups.com

 From: d-m-hague(at)comcast.net

 Subject: US tank balance

 

 --> Kolb-List message posted by: Dana Hague <d-m-hague(at)comcast.net>

 

 One thing I've noticed with the original dual tanks on my UltraStar is that 

 they don't drain evenly.  With the plane sitting on the ground they level 

 out C but in flight the left tank tends to run somewhat lower than the right 

 (they're plumbed together on the inner side of the valves with the outer 

 sides tee'd together at the fuel strainer).  Anybody else see this?

 

 I presume it's due to minor variation in air pressure at the vented caps C 

 which could be alleviated by poking holes in the top of the tanks and 

 running a tube between to let the air balance... thoughts?

 

 -Dana

 --

   Campaigns to bearproof all garbage containers in some national parka have 

 been difficult C because as one biologist put it C "There is a considerable 

 overlap between the intelligence levels of the smartest bears and th

 

 

 

Windows Live™: Keep your life in sync. Check it out.   	  Quote: 	
		  [b]

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ulflyer(at)verizon.net
Guest

Posted: Tue Jun 30, 2009 8:15 am Post subject: US tank balance

Are you sure your flying wings level - be surprised how many pilots 

do this and not realize it themselves until it pointed out to them 

including myself.

jerb

At 08:04 PM 6/29/2009, you wrote:

 	  Quote: 	
		  



One thing I've noticed with the original dual tanks on my UltraStar 

is that they don't drain evenly.  With the plane sitting on the 

ground they level out, but in flight the left tank tends to run 

somewhat lower than the right (they're plumbed together on the inner 

side of the valves with the outer sides tee'd together at the fuel 

strainer).  Anybody else see this?



I presume it's due to minor variation in air pressure at the vented 

caps, which could be alleviated by poking holes in the top of the 

tanks and running a tube between to let the air balance... thoughts?



-Dana

--

  Campaigns to bearproof all garbage containers in some national 

 parka have been difficult, because as one biologist put it, "There 

 is a considerable overlap between the intelligence levels of the 

 smartest bears and the dumbest tourists."

- The Matronics Kolb-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Tue Jun 30, 2009 1:26 pm Post subject: US tank balance

At 12:12 PM 6/30/2009, jerb wrote:

 	  Quote: 	
		  



Are you sure your flying wings level - be surprised how many pilots do 

this and not realize it themselves until it pointed out to them including 

myself.


	


Good point, but no, not in this case... there's up to an inch difference in 

the level even at the center where the two tanks are practically touching.



-Dana

--

  Giving money and power to government is like giving whiskey and car keys 

to teenage boys.

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