[NSRCA-discussion] Header Tank

[Dean Pappas]

Hi Jay,
Okay, you are 
1) looking to isolate the fuel feed from the height difference
the tank goes through in different attitudes. I guess that means you want to try and not use a pump.
2) The other alternative would have been if you were looking to fix a problem with
picking up slugs of air near the end of the tank.

To move the main tank back without a pump.
In the setup Glen gave you, you want to run a fairly large air bubble in the hopper or header tank.
If there is no air bubble or a very tiny one, then you get almost no isolation.
Place inner end of the vent line a little ove 1/2 tank.
Then when you fill, the hopper will be maybe 5/8 full and then all the rest of the
fuel goes into the main tank. Put a short clunk in the hopper (1/2 way back)
and you will not pick up any air in a vertical downline either.

For preventing pickup of air (especially good with Perry style pumps and YS DZs)
make the hopper clunk go 1/2 way back, and put the vent tube inside the hopper
all the way to the top, so that the hopper fills with only the tiniest air bubble in it possible.

Oh yes, use the Perry!
best of luck,
Dean


Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Jay
Marshall
Sent: Tuesday, January 16, 2007 11:54 AM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Header Tank


What I want to do is to move the main fuel supply further back towards the
CG. I have a Perry Pump but thought I would rather try the header tank
method.

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dean Pappas
Sent: Tuesday, January 16, 2007 10:43 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Header Tank

Jay,
Glen steered you right, but there's more to it.
Which problem are you looking to solve with a header tank?
It actually matters.
Dean

Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com

>  -----Original Message-----
> From: 	nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]  On Behalf Of Glen
> Watson
> Sent:	Tuesday, January 16, 2007 9:57 AM
> To:	'NSRCA Mailing List'
> Subject:	Re: [NSRCA-discussion] Header Tank
> 
> Jay,
> 
> Plumb both tanks with traditional two line system, one vent line and
> one pick up line.  
> 
> 		-	Connect the header tank pick up line to the
> engine carburetor
> 		-	Connect the header tank vent line to the main
> tank's pick up line
> 		-	Connect the main tank vent line to muffler
> pressure
> 
> Like a traditional two line system use the carb line as the fill point
> and the muffler pressure line will be the over flow.
> 
> Regards,
> Glen Watson
> http://www.geocities.com/rcprecision/pah.html
>   
> _____________________________________________
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay
> Marshall
> Sent: Tuesday, January 16, 2007 5:03 AM
> To: NSRCA
> Subject: [NSRCA-discussion] Header Tank
> 
> I would like to try a header tank in my new plane but have never done
> so before. How do you configure a header tank for an OS 91FX?
> 
> Jay Marshall
>  << File: ATT00036.txt >>  << File: ATT361602.txt >> 

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