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HomeTurbineAircraftHelicopterTurbine Helicopters › Turbine fuel set up check.
03-16-2015 09:13 AM  3 years agoPost 1
helihenry

rrNovice

uk

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I am just coming to the end of my Trex 800, Wren44 build and just have a couple of questions on the fuel system.

It is a Revmod conversion but instead of the 1200 Dubro tank I have used a couple of Sigg 600 water bottles, probably been easier to stay with the Dubro but hopefully should look good when they are painted in the same scheme as the canopy.

The feeds are coupled in series to a GBR JETS air trap.

http://www.gbr-jet.com/catalog/prod...&products_id=65

I have used the GBR JETS filtered clunks but not sure how effective these will be if I fill the tanks backwards from the air trap. I suppose they will filter crap that is drawn in through the vents.

1. Can I couple the vents together or leave them both to air?
A friend of mine who was into jet planks says that coupled vents could alter the way the 2 tanks empty simultaneously.

2. I have made up my own fueling can with electric pump. I want to keep things as clean as possible and not get too much kero all over my hands.
Am thinking about this quick coupling on the heli instead of a fuel dot but am wondering about the sealing qualities of quick couplings and air getting back into the trap.

http://www.motorsandrotors.co/index...products_id=613

Are quick couplings a good idea or am I being too paranoid?

Simon

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03-16-2015 12:31 PM  3 years agoPost 2
Jerry K

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Houston Area

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You cannot be to paranoid on a turbine fuel system. Do not use any filters in the tanks and I would not hook them up in series. A parrellel system provides less total restriction for the fuel system. Make sure your fuel lines are the exact same length, then test your fuel system for equal draw down. Avoid quick fittings and tygon on the suction side of the pump. Only use 6mm poly tubing outside and large tygon inside the tank. Be very critical about fitting size and if you can have both tanks feed into the header tank seporatly with their own fitting. If the pump draws hard enough it can vaporize the fuel even in a tight system and cause bubbles. never drain the header tank always leave it full even between outings.

In total disclosure I do not fly turbine Helis but do have 10yrs+ expirence in turbine planks I remember plasma bags before they were outlawed.

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03-16-2015 01:42 PM  3 years agoPost 3
helihenry

rrNovice

uk

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Sorry, I did not make my system very clear.
I am running the 2 tanks in parallel with the two feeds equal length to the T piece then on to the air trap.
My question was about the two vents, can these T piece to a single vent or do I keep two vents to the bottom of the heli?
I am using GBR Jets clunks with built in paper filter. They will not filter incoming fuel but the will filter out any muck drawn in through the vent/s.

I have asked Dave Wilshire (Motors and Rotors) about the quick fueling coupling and he said it has a one way valve to prevent air being drawn into the air trap. This is the part I was worried about as a possible source of air ingress. Are you lot ok with using something like this?

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03-17-2015 12:37 AM  3 years agoPost 4
MattJen

rrElite Veteran

UK

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On one of my first turbine machines which was a Jetcat Hotcat
I had two separate fuel tanks, which were bottles, they BOTH had a vent which exited out of the rear of the machine this was the way my machine was built and it worked fine, they were connected to the header tank via a T piece, this also worked fine for me and is still going all these years later when I sold the machine on..

The quick filling system you have is great I have had that system on all my turbines. It does have a one way valve as you posted.

All The Best

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03-17-2015 11:46 AM  3 years agoPost 5
helihenry

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uk

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Thanks Matt,
Excited about getting my first turbine up and running but a bit scared as well as my flying is still in it's infancy.
Bit of a fair weather flier so awaiting a warm calm spring.
I have an M series Helicommand which I have fitted to a FBL Trex600 to try it out thinking I will fit it to the turbine as a 'get out of jail free'. Not tried it yet so might just fit the BeastX I was going to fit originally.

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03-17-2015 10:16 PM  3 years agoPost 6
Chris Bergen

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cassopolis, MI USA

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It's perfectly fine to "T" the vents together.

Running the tanks in parallel works great, as long as all lines are equal as stated.

Chris D. Bergen

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