Gasculator 7th April 2008.

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The gasculator supplied is different to the one in the plans so a little bit of creative thinking needed here. First problem, how to mount it vertically against a fire wall that is at an angle. My solution , 4 angled aluminium blocks cut at the same angle as the fire wall. Next problem , how to add a bit of strength to the fire wall. It moves in and out 1/4" each way at this point so the gasculator would be vibrating like crazy and doing horrible things to the fuel inside. My solution was to add a horizontal piece of channel on the inside and a vertical piece on the outside, this stiffens it up beautifully , now I can do a fuel drain without the gasculator moving 1/2" when I push on the drain valve.

The channel on the inside will be covered with another piece the same size to form a closed box so there can't be any contact with the fuel line and the co pilot's feet, and all you will see is the fuel line exiting the box next to the centre stiffener where it will travel up to the tank.

Design change 19th April 2008, I forgot to put the lower hinge on for the cowling.

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The new parts. A view from underneath showing the hinge and my block mounting system.This time the vertical front channel stops about a 1/2 an inch short at the bottom to alow room for the hinge and extends further up to alow the gear mount bolt to carry through it and the firewall. The 3 1/8" washers are used to fill the gap between the mount and the firewall.

I cut the old channel in half and mounted a section of it inside so it will rivet to the hinge at the bottom and the front channel at the top. My new setup is much stronger and hopefully will not cause me any more anguish.

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The spacers bolted up. A view inside showing the lower channel. The cover on and the fuel line going in.

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This is how I will bring the fuel through the firewall, the block is made from some 1" x 3/4" aluminium bus bar which has come in very handy as I have made lots of things out of it. The last photo is my tank selector under construction , it will have left , right and off positions. I originally intended to buy one of these but apart from costing a fortune the only ones I have seen look like they come out of a 747-400 so I decided to make my own.

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The gasculator finally in , what a battle that was, getting the connections in and sealed, no grommet yet and no cover till I check every joint for leaks. Photo on the right is the aux fuel supply emerging through the fire wall and up to the top of the gasculator. The red line goes up to the mechanical fuel pump on the engine.

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Inside the cabin the aux fuel going through the fire wall. The second shot showing both fuel supplies.My fuel system schematic.

With 45 litres in the main tank , the plug removed from the bottom of the gasculator and the fuel valve open I get a flow rate of 625 ml in one minute relying on gravity alone. This equates to 37.5 litres per hour. With the main valve closed , the electric pump running and 5 litres in the rear tank I get 1.2 litres a minute or 72 litres per hour. According to the Jabiru manual the 3300 requires 40 litres an hour on take off.