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HelicopterTurbine Helicopters › Installing a used HP5, need help
01-10-2011 10:07 PM  7 years agoPost 1
wed_ace

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Ft Lauderdale, Fl

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I'm installing a used HP5 mechanics that I picked up from a friend with super low hours on it. Just have some question about the fuel tubing zise and the way I'm running it?
System will run off of two JetTech Kevlar tanks on each side of the heli. From the tanks I will run an equal amount of tubing on to a T and then to a sigle line to the BVM UAT. Then a line from the UAT to the pump. The two tank breathers/overflows will run in to a T and down to the botom of the heli.

Please let me know if I'm running everything correctly?
What size tubing is recomended to be used?
What brand and size T conectors to use?
On the HP5 mechanics they used FESTO T and other conectors was this done properly?

Thanks for your help, I can't wait to get the Bird up and running.

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01-10-2011 10:36 PM  7 years agoPost 2
Peter Wales

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Orlando Fl

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Your scheme is what I run, other than teeing the vents. No reason not to if you want to.

I use all tygon yellow gasser tubing, the red stuff goes rock hard very quickly with kerosene.

Run Tygon everywhere, but cut a short piece out of the UAT. Then fit a 4mm piece of tubing inside the tygon to run to the fuel pump. It will stay in and wont leak as it is on the suction side. You will find it goes in easily enough, but once it has been in for a while, it sort of amalgamates itself to the tygon and forms a connection difficult to separate.

Everything after the fuel pump is 4mm

Peter Wales
http://scalehelicopters.org

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01-11-2011 01:35 AM  7 years agoPost 3
Billj

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Max Meadows, Virginia

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Mr. Wales is on the money.
Avoid festos where possible in connections as they can leak However in your drain lines that is of no consequence

You may also need to include a manual shut off valve between the UAT and the Pump in case you have something go south. AMA requires it on planes. I believe the same standard applies to Heli.

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01-11-2011 04:27 AM  7 years agoPost 4
wed_ace

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Ft Lauderdale, Fl

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Thanks for the quick replies.

"tygon yellow gasser tubing" what zise do I use? Does this come in only one size?

I will follow the trick with a piece of tygon tubing and 4mm tubing out of the UAT, as per instructions..thanks

yes thanks I will install the shut off valve to comply with AMA.

Also this HP5 system is equipped with a kerosene start. What is the procedure with this system? What do I have to look out for as far as problems?

Thanks again,

Jose

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01-11-2011 10:15 PM  7 years agoPost 5
Billj

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Max Meadows, Virginia

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I am not familiar with the heli Jet cat starts ...But on My plane,which is K-1 start the biggest threat is a hot start.. Where the raw K-1 is not lighted by your glow plug/stick. This will result in fire belching out of the exhaust like the BatMobile. This is where stuff can catch on fire. Make sure your fire extingushier is handy.
You'll also need to be sure your lines are primed and free of air bubbles as possible and that your starter battery is good along with the glow stick/ or plug.
There are many ways of checking this with your GSU.
Perhaps someone with hands on experience with a Jet Cat heli will jump in here.MIne is a different brand of Turbine.

Do you have someone near you that has run one of these ? A little experienced help on those first few starts could go along way.

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01-12-2011 03:21 AM  7 years agoPost 6
Peter Wales

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Orlando Fl

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I only know of 2 tygon sizes and you need the large size to takethe UAT and the 4mm tubing inside

Kero starts are not usually a problem, but Bill is on the money this time.

Ensure the priming is complete, and then I would do the first start with a big external battery as you may get a few false starts until all the air is out of the UAT and lines. Once it is running, you can shut down and restart on the on board battery.

As Bill says, keep the fire extinguisher (CO2) right at hand. The resulting fire on a heli will usually be less dramatic than a plane as the exhaust is normally shorter. The excess fuel burns in the exhaust and with no air to blow it out of the end, the exhaust gets very hot and sets fire to the aircraft. A long exhaust on a heli may do the same thing.

Once it has started never let it run out of fuel. Then you should be ok as long as the battery is good and the GSU will usually stop the turbine before it even starts as it tries to light the glow stick and fails

Peter Wales
http://scalehelicopters.org

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01-12-2011 09:49 AM  7 years agoPost 7
darrens

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United Kingdom

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I have the same equal length tubing coming out of each tank into the T piece. You naturally assume as the lengths are equal the drain will be, but that is not always the case. To this end, I also have a balance pipe connection between the tanks which helps them equalise naturally.

He who dies with the most toys is the winner!

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01-12-2011 11:04 AM  7 years agoPost 8
PETER ROB

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Devon UK

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Equalising fuel tanks (gravity)
Following on from what everybody else is saying, all good tips by the way
All helicopters hang either to the left or the right depending on blade rotation, (especially scale with slower head speeds) this means the tanks will always show or have differing amounts of fuel in each tank
Providing you fly a ballanced flight, ie, equal left hand circuits to right hand circuits there should not be a problem, you can always use a timer
In the extreem ie, pod and boom turbine, flying knife edge circuits, once the fuel goes below 1/2 in each tank, it is possible to draw air from the top tank, this I found out to my cost, even with a timer, I let the fuel level get too low
Be warned
Peter R

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