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02-06-2006 06:55 PM  12 years agoPost 1
Aaron29

rrProfessor

USA

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..

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02-06-2006 06:58 PM  12 years agoPost 2
Shortman

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Portland, Oregon

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What about the whole thing with the filter between the header tank and the main tank? Does that cause the motor to quit when doing 3d?

Team JR
Team ThunderPower RC
Boca Bearings

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02-06-2006 07:01 PM  12 years agoPost 3
Yug

rrMaster

UK. Herts

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You are kind of right. However, the only time i've noticed the header tank to not be full is when there is a split clunk line and I do plenty of 3D. I am supprised that bubbles in the header tank are not more common.
However, then main reason for a header tank is to help even out the fuel pressure, and consequently the mixture, resulting in a more consistent run from full tank to empty tank.

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02-06-2006 07:08 PM  12 years agoPost 4
Aaron29

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USA

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Header tanks don't equalize pressure. Thats a horse that has been beaten to death and I don't care to discuss that here. We can open a new thread and argue that one.

My point is the level will drop.

Header tanks are still effective. But for different reasons than we know. When you see air in the header tank that is a good thing. That is air that WOULD have gone into your engine.

If you see no air in the header tank it is not doing anything for you. You'd be OK with a no-header setup.

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02-06-2006 07:08 PM  12 years agoPost 5
Coloradoheli3d

rrApprentice

Colorado USA

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From what I remember header tanks were to help put the center line of the fuel tank with the center line of the carb to remove the rich running at a full tank and a lean run when the tank gets empty. But I also have not noticed my header tank getting low befor the main tank runs dry, but I allways fill my header tank and remove all the air, and when land my heli there is air in it, so it is getting air from the main tank.

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02-06-2006 07:09 PM  12 years agoPost 6
falcon

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UK

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We could go on about this one for weeks.
i will sum up my view, i flew for 15ish years without a header tank no problem.
I now use a header tank and the best thing about it is the increase in capacity and the oh! my god nearly out of fuel thanks for the header buffer.
Cheers
Kent

www.m0kwr.com

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02-06-2006 07:10 PM  12 years agoPost 7
Aaron29

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USA

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Yeah Coloradoheli3D air in the header tank tells you it is doing it's job.

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02-06-2006 07:13 PM  12 years agoPost 8
webbhost

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england - Leicester

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lets just say you are right and in hard 3D, alot of air gets into the header tank - its better to be in the header tank than sucked into the engine. As for the fuel going low thus draining the tank - it depends what way you look at this - if i only have fuel in the header tank, that is an indication to me that i should immediatly land.. I only like flying from the fuel in the main tank, if thats empty or low its time to land, header tank or no header tank.

meh

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02-06-2006 07:19 PM  12 years agoPost 9
Leif

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USA

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If the header tank is 100% full you aren't getting the benefits it has to offer
So if you don't crash your car or burn your house down you aren't getting the benefits of insurance, right? You buy insurance to protect you in the EVENT that something bad happens, even if the chance of that is remote.

The bubble trap capability of a header tank IS a sort of insurance, and it's a darn good one to have. Clunk lines have a nasty ability of cracking when you least expect it, and seeing the fuel level drop in the header is a nice wake-up call to figure out what's going on.

Leif

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02-06-2006 07:25 PM  12 years agoPost 10
Aaron29

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USA

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Good point Leif.

Like a circuit breaker or a fuse, it will tell you when somethings wrong without working all the time. May not need it, but it's always there for you.

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02-06-2006 07:57 PM  12 years agoPost 11
Furious Predator

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Kitchener, Ontario, Canada

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how does a buble in header tank act as a so called trap? especially since the fuel system is pressurized, either muffler/pump/crank case.the main tank has pressure in it wich would pump fuel into the header, regardless of an air bubble being in the way.

i love the way the header tanks work, simple and very effecive. i have landed my machine with 3/4 of the header with fuel in it, it shows you how much air would have been sent to the engine instead of fuel, preventing a bad day (possibly).

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02-06-2006 08:08 PM  12 years agoPost 12
spaceman spiff

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Tucson

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After every flight, there is quite a bit of air in my header. Every bit of the air in the header would have otherwise gone into my engine. proof enough for me.

might be fun experiment to put a second header on to see how much air gets past the first header. i doubt there will be much of it that gets past the first one.

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02-06-2006 08:22 PM  12 years agoPost 13
JitsuGuy

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Tulsa, Oklahoma

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Why does Curtis not fly with one? He does serious 3D.

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02-06-2006 08:43 PM  12 years agoPost 14
Clayman

rrVeteran

Richer, Manitoba, Canada

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Header tank = bubble trap. That is the main reason we use one.

If U Don't Fly U Don't Try

Trex 600 Pro OS50 Hyper

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02-06-2006 08:48 PM  12 years agoPost 15
spaceman spiff

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Tucson

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there are alternatives that work very well. Bubbless tanks work great (a flexible plastic liner inside the tank that collapses) and there are sintered bronze filter/clunks made by Dubro and OS that also do a great job of keeping air out. the sintered bronze filter clunk draws in and holds fuel by suface tension so it holds fuel and rejects air. use it in all my planks, but they don't fit thru the small hole in my rappy tanks..

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02-06-2006 09:54 PM  12 years agoPost 16
Leif

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USA

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Why does Curtis not fly with one?
I believe Curtis flies with a pumped fuel system. When using a pump, a much larger amount of fuel is drawn through the pump than the engine requires, and the excess is returned to the tank. When a bubble is drawn through the pump, most of the bubble is also returned to the tank.

When using a pressurized tank to deliver the fuel, the entire slug of fuel is delivered to the engine. A bubble in the line will end up at the carb.

A small bubble in the fuel line does not mean your engine will quit. In fact, the engine can usually "run through" a bubble with the only symptom being a short period of lean running. Of course, that can also be a bad thing for the engine so it's something we try to avoid.

Leif

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02-06-2006 10:22 PM  12 years agoPost 17
Aaron29

rrProfessor

USA

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Leif I just added you to my:

"List of people who know what they're talking about, so ask them questions"

List.

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02-06-2006 10:27 PM  12 years agoPost 18
airdodger

rrElite Veteran

Johnston USA

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http://www.curtisyoungblood.com/faqs/ Question #698. Chris

Chris

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02-06-2006 10:36 PM  12 years agoPost 19
zoom boy

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N.E. Lincolnshire UK

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The myth:

A header tank will always be full. The engine always draws fuel from the header tank. The header's level does not drop because it's a closed system so instead it draws from the main tank and is always full. Life is bliss.
100% right.

But I dont think I've ever seen anyone say that it always will be full.

When anyone asks me what that little tank on the side of the heli is for, I call it the little bubble catcher.

Thats all it does (most of the time) and since it catches those bubbles then they displace some of the fuel, thereby causing it to not be quite full.

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02-15-2006 08:01 AM  12 years agoPost 20
Shortman

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Portland, Oregon

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Just curious, I notice when I fly inverted or fly around, EVERY flight, the header tank seems to be about half full with fuel still left in the main tank. Now when flying inverted does this draw fuel from the header tank, the clunk line or something not picking up in the main tank or what?

Team JR
Team ThunderPower RC
Boca Bearings

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