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HelicopterTurbine Helicopters › Header Tank
12-01-2005 02:00 PM  12 years agoPost 21
wolfdad

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Southern Maryland

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Phil,
My guess would be that the location of the UAT versus the pump on Greg's machine was a contributing factor...and, it would only do it and, Greg correct me if I mis-state this, during pirouetting manuevers. I think location, plus the filter restriction plus the G force of a pirouetting manuever all combined to restrict fuel flow to a flame-out flow.

Doc

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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12-01-2005 02:19 PM  12 years agoPost 22
WIRLYBIRD

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CAPE TOWN / SOUTH AFRICA.

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FeltFilter

Hi Richie,
I don't think it matters what clunk you use, and I use the felt ones x 2, with a turbine you don't want to scrape the bottom of the barrel, rather refuel and have an extra safe flight.You will be suprised how quickly 2 liters of fuel gets used up, and get an unwanted auto at the wrong height , and position in the relation to the ground.I've fitted the red flashing warning tight to the ecu, fires the warning at the last 500ml level , and the alarm on my MC22 radio goes off at the 11 minute mark, leaving +/- 3 cm of fuel covering the clunk.
Happy flying.
Best regards,
Dave.

WHAT GOES UP MUST SURELY COME DOWN.

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12-01-2005 02:40 PM  12 years agoPost 23
richie1967_uk

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London UK

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Thanks whirlybird, like you say i dont want a forced auto!! The header is to increase the safety margin...

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12-01-2005 05:16 PM  12 years agoPost 24
coolice

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Northamptonshire, England

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Hey,

With the UAT follow the instructions supplied, Phil and others are correct in saying the UAT once fitted should be filled and left alone before running to allow bubbles to settle.
I can't remember if it's 24 or 48 hours off the top of my head now?

Ideally it would be best if we could run the turbines upto full RPM after fitting the UAT, this in itself would purge all bubbles as the fuel supply would be at it's greatest. I think again the instructions suggest this.
But, alas in a heli it's a bit difficult to do that part of the manual.

Take things steady when fitted and if anything fancy is tried go high and be ready to dump the collective if need be.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

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12-01-2005 05:46 PM  12 years agoPost 25
PETER ROB

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Devon UK

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Soaking the UAT

The reason for soaking the membrane before use is to stop any air passing though it, not to get rid of the air bubbles gravity will do this, after fitting you will need to purge your system any way, this should remove any air on the wrong side of the membrane, if you have time a little experiment, get a piece of your girl friends nylons ( pantyhose ) soak in water shake of the excess then try filtering oil, new piece of nylon soak in oil get rid of excess try filtering water, this will give you some idea how the membrane in theUAT works

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12-01-2005 06:50 PM  12 years agoPost 26
PETER ROB

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Devon UK

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CJ I was thinking of borowing some of yours if I retry the experiment not the" Fish Net "ones though mesh is too large

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12-01-2005 07:18 PM  12 years agoPost 27
1275mini

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Wirral North West U.K.

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Stockings do it for me

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12-01-2005 08:15 PM  12 years agoPost 28
Chris Bergen

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cassopolis, MI USA

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I routinely fly my Turbine until I run out of fuel (just having so much fun!), I then refuel and go fly again. When I run it out of fuel, the UAT is empty except for the small amount, 1/4" or so, in the bottom.

I haven't experienced any flame outs other than self induced , because of this. I don't do any purging or letting it sit for a day, never have.

I do have my UAT sitting upright, per the instructions, so any air in the tank will be the first thing out when I go to start the Turbine.

Any thoughts?

Chris D. Bergen

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12-01-2005 08:25 PM  12 years agoPost 29
richie1967_uk

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London UK

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Well its now fitted and full of fuel...its gonna have to soak overnight as its to late to fire the turbine up now anyway!!

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12-01-2005 08:48 PM  12 years agoPost 30
bladebender

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England, Central

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Its never to Late

Im sure my neighbours love the sound of the turbine late at night!!!!!

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12-02-2005 12:42 AM  12 years agoPost 31
jkru

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Seattle, WA

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I have had a failed start due to an airbubble. I had one out of fuel situation which is really strange cauze the engine quitley spools down as your feeding in pitch and wondering what happened. Dead turbine definatly doesnt have the same affect as dead nitro. UAT is a must IMHO.

JKru

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12-02-2005 11:32 AM  12 years agoPost 32
Bell Bloke

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UK

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I'm with BergenRC, I do the same as him.

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12-02-2005 11:53 AM  12 years agoPost 33
wolfdad

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Southern Maryland

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jkru,
When my gearbox let go up in Delaware back in July, talk about confusing! I had noise, I had pitch and I thought I had power. However, wrong distractor on the last item. I was about 30 feet up, coming out of a left turn when it let go. Auto'ing from 30 feet with a brick, no matter how quickly you drop the collective just doesn't work that well, so I concentrated on a straight-on upright landing and making it as soft as possible. Hit hard, bounced and then tipped over, however, at that point, the head speed was so low that the blades were ok, although I lost a main rotor shaft and blade spindle shaft along with a skid. Could have been much worse.

Chris, with all the bells, lights and whistles on our current-day transmitters, I, being of not so sound mind, set whatever available alarm for about 9-10 minutes, because I too start having fun and forget about fuel. No longer running a UAT...just the felt clunk pick-up and the Wren inline filter with absolutely no problems.

wolfdad sends....

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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12-02-2005 12:51 PM  12 years agoPost 34
1275mini

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Wirral North West U.K.

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Felt clunk pick-ups and Wren inline filter ! sounds good to me Doc
no room left on my TT predator to mount any more parts

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12-02-2005 12:53 PM  12 years agoPost 35
1275mini

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Wirral North West U.K.

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So Richie how long you getting out of the 1500cc Du-Bro tank?

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12-02-2005 12:57 PM  12 years agoPost 36
richie1967_uk

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London UK

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well this is the problem....i was getting nervous running it much past 3/4 full so about 8 mins.....with the UAT i can get another few mins by using more of the fuel in the main tank...well thats the theory anyway!!

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12-02-2005 01:22 PM  12 years agoPost 37
richie1967_uk

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London UK

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i am not planning in draining the UAT, it just gives me the confidence to use more of the fuel in the main tank!!

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01-03-2006 06:54 PM  11 years agoPost 38
Chris Bergen

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cassopolis, MI USA

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Not at this time, although someone will probably come up with a set.

The fuel tanks On the Bergen Turbine are spun aluminum, very durable, but very hard to see through!!

For the first few flights, we recommend just hovering it around, getting the engine settled in, making sure the mechanics are together properly, while doing this, keep a timer going.

Initially you'll probably end up around 12 minutes before flaming out.

Set your timer on the TX for 11 minutes and land when you hear the beep!

Chris D. Bergen

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01-03-2006 07:35 PM  11 years agoPost 39
wolfdad

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Southern Maryland

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Chris,
Actually, you could make clear fuel tanks out of the Lexan water bottles and they run in the same sizes as the fuel cells you and I are using and a bit larger if desired. If you get the "better" ones the lid seal is no problem and you basically modify the bottle exactly as you do on the bottles for the Bergen. I actually tried two 32 ounce'ers on the TurBen, however it wound up throwing the CG a bit too far aft for my liking. And, what's really cool is that you can get these bottles in just about any color of the rainbow. Mounting brackets for the different diameter tanks can be quickly fabricated out of aluminum angle, however I strongly recommend some form of padding where the angle makes contact with the bottle. A couple of slots for the velcro and you are off to the races.

wolfdad sends....

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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01-03-2006 07:37 PM  11 years agoPost 40
1275mini

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Wirral North West U.K.

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Hey Doc looks like i am off to Wren next week!

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HelicopterTurbine Helicopters › Header Tank
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