Re: [Titanaircraft] Aux tanks

Chinook tanks are available from Titan. They usually have the installation parts in stock. Two tanks add about ten gallons capacity. The mounts and plumbing will be internal. On a completed wing, installing the hard points will require removing some skin from the lower surface of each side of the wing, installing some additional shear webs, installing the tank mounts, installing fuel lines and installing some wing skin. If one has good shop skills, it's a moderately difficult job.
If the wing isn't finished, it's an easy process to install the parts prior it installing the wing skins.
We built a few wings with four sets of hard points so four Chinook tanks could be mounted (20 gallons). Titan usually doesn't usually do that, but the parts are the same so just order twice the number of parts from Titan. Leave one bay open between the hard points.
I used to run the tank in the back seat for ferrying Titans around, but the tank does use up the passenger space.
  -- Guy

--- On Fri, 8/28/09, Peter Cowan <pcowan41@sympatico.ca> wrote:

From: Peter Cowan <pcowan41@sympatico.ca>
Subject: [Titanaircraft] Aux tanks
To: Titanaircraft@yahoogroups.com
Date: Friday, August 28, 2009, 5:30 AM

 

OK Claudia, here are my thoughts on aux fuel. I don't fly a Titan but for this topic the aircraft type is not very relevant.

Sounds like Guy, Vivian and Andre have one good idea for a rear seat aux tank which is fine if you don't mind losing the seat. If you still need the seat may be this approach with external tanks from a chinook would work.

Here the tanks are easily removed leaving the plumbing in place (quick disconnect at the tank).

The issues (no matter what tank you go for) are venting, back flow from mains, valves, electrical control and accessibility. With a back seat tank and the above chinook tanks, if you don't have check valves and you aren't careful with the on/off valve, the mains can drain back into the aux. If you took the vent high enough that would solve the problem but at least getting it outside as Andre mentioned would minimize the problem.

Basically you put a T in the fuel line between the main tanks and the engine and after the main fuel shut off valve. This new line which will connect to the aux tank needs a shut off valve which you can reach in flight. In the S7 pictured above, the new line goes to a left/right valve to select either aux tank or off. It didn't need another fuel pump because the engine driven pump is enough. If you use a back seat tank, the new line would just go to the quick disconnect at that tank.

The main valve is on the left. The T feeds the 3 way valve on the right (left off right).

The chinook tanks have a check valve but the word is they regularly fail so I chose to remove them. Yes, I have forgotten to shut off the valve to them and did dump fuel on the tarmac when filling the mains.

Another side benefit of the T, valve and quick disconnect is that it can be used to re-fuel the mains. I have a 60L tank with a fuel pump mounted and simply plug this in while I'm pre-flighting. It is not fast but it saves holding a can above the wings.

Peter

Have you got your AOA installed yet??

http://www.pipcom. com/~cowcam/ AOAr.htm

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