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HelicopterMain Discussion › Header Tank?
12-30-2009 07:18 AM  7 years agoPost 1
Terrabit

rrElite Veteran

Seattle, WA - USA

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Why run a header tank?

My primary rational for adding a header tank is:
  • Insurance against a forced auto
  • More even fuel flow and preasure
  • Move cg to center from nose and muffler
  • Okay, it looks cool too
I'm comming from electric so I don't have a lot of experience with this stuff. I'd appreciate some input from you pros about why or why not to add a header tank.

Thanks!

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12-30-2009 07:36 AM  7 years agoPost 2
30636086

rrKey Veteran

Tacoma, WA

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A piece of mind and cheap insurance to avoid a few things that can go wrong.

I dont suffer from mental iIlness, I actually enjoy mine!

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12-30-2009 08:34 AM  7 years agoPost 3
Popadel

rrNovice

Johannesburg

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My view is you dont need it these days, but many still use it. Get a fuel magnet instead.

Srimok 90 - OS 91 HZ PS ; Trex 600ESP 12S 560 scorpion; Trex 450 Pro Scorpion 222-6; Trex 250 SE

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12-30-2009 09:17 AM  7 years agoPost 4
asm

rrVeteran

California

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If you use Fuel Magnet, be sure to replace the fuel frequently. Or when it falls apart, pieces are going to get stuck in your carby.

I use header tank to avoid the trouble with fuel Magnet

-

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12-30-2009 09:23 AM  7 years agoPost 5
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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My only reason is consistent flow and air bubble insulator. I am considering switching to a magnet because header adds points of failure, mostly more places for air to leak and lean motor. It adds complexity and IMO looks messy.

RIP ROMAN

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12-30-2009 12:15 PM  7 years agoPost 6
JRjoe

rrElite Veteran

Jonesville , IN USA #1

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Seems like he answered his own question...
[list]
[*]Insurance against a forced auto
[*]More even fuel flow and preasure
[*]Move cg to center from nose and muffler
[*]Okay, it looks cool too


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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12-30-2009 02:39 PM  7 years agoPost 7
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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the header tank was originally incorporated to provide a consistent engine run. see, back in the early 90's, when you were building your heli, you were required to dial guage the start shaft and clutch assembly and or balance the fan and flywheel. why? because if you didnt, you would get a high frequency vibration in your heli that would cause the fuel tank to foam. well, when the tank is full, you wouldnt get much foaming, but as the tank get towards half or so, the foaming starts and then the little air bubbles would start getting to the carb causing the mixture to go lean. then as the tank gets close to empty, the engine would start running so lean it would start overhearting and lose power. if you attempted to richen the mixture as it leaned, then when you next started with a full tank, it would be too rich then. well, since not everyone had a dial guage to fix runouts that cause these vibrations, the header tank was used to basically fool the engine into thinking it was full all the time. the air bubles that came from the main tank gets trapped into the header and not make it to the engine.
extended duration was never really a major reason for a header because the bigger engines dont run very long on 1 or 2oz of fuel. well nowadays the newer helis dont require the dial guage like they did back then but the header tanks caught on and certainly help with fuel monitoring if the main tank is hidden up front under the canopy.

drive a rotary, fly a rotorcraft

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12-30-2009 05:14 PM  7 years agoPost 8
cdrking

rrElite Veteran

Seattle

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  • Just land before the pink stuff runs out
  • HZ with a fuel magnet runs great
  • cg usually not an issue
  • looks cool too when you run out of gas and save it
Reasons why NOT to use a header tank:
  • More places for something to go wrong
  • More places for fuel leaks
  • A little more clunk line to change
  • Doesn't look cool
  • 700 already has a huge tank
Jeff

To hover is divine, the alternative is rather PLANE.

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12-30-2009 05:31 PM  7 years agoPost 9
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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i dont like using the headers because i do mostly scale and you have to find a place to put it, worry about the extra plumbing, set up a convenient way to fuel with it in place, cant see it in a fuse anyway, i usually have the biggest tank that will go ina fuse, usually bigger than the pod n boom tank.
whats this fuel magnet i keep hearing mentioned here? educate me please

drive a rotary, fly a rotorcraft

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12-30-2009 06:02 PM  7 years agoPost 10
dkshema

rrMaster

Cedar Rapids, IA

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Header tanks do nothing to provide "more even fuel flow and pressure".

The pressure at the vent side of your main tank from the muffler is the same all the way through the fuel system up to the carburetor input nipple.

Their purpose in life is to filter out bubbles, large and small, that if they make it to your carburetor can create tuning headaches and if the bubble is large enough, flame you out.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-30-2009 06:09 PM  7 years agoPost 11
Nashville

rrElite Veteran

Formerly Music City now back home in Sunny Florida

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Why run a header tank?
The real reason... to squeeze out another 45 seconds of flying!

I was Spektrum when Spektrum wasn't cool

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12-30-2009 06:09 PM  7 years agoPost 12
Sillyness

rrVeteran

Little Rock AR

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115 flights on my Vibe w/ NO header and NO fuel magnet, etc... stock clunk w/ Aerotrend fuel tubing... engine has never burped in hardish 3D.

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12-30-2009 06:31 PM  7 years agoPost 13
Terrabit

rrElite Veteran

Seattle, WA - USA

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Their purpose in life is to filter out bubbles, large and small, that if they make it to your carburetor can create tuning headaches and if the bubble is large enough, flame you out.
I guess that's what I meant by even flow.

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12-30-2009 06:45 PM  7 years agoPost 14
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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'sides, if you are an electric guy just tryin' out nitro you wont know what to do with more than 5 mins of flight

RIP ROMAN

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12-30-2009 06:46 PM  7 years agoPost 15
jschenck

rrProfessor

La Vista, NE.

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one minus is it adds 3+oz of weight to your heli (with fuel).

I have had a flameout because of a header tank. It was sucking air in around the seal, filled with air with about 1/2 the main tank still full.

It's about a 50-50 if I will run one or not. Some of my heli's have 'em some don't My 700 does not and will not. The bigger 90 size fuel tanks are easier to setup with an internal clunk line that will get all the juice. I haven't used a fuel magnet yet.

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12-30-2009 06:57 PM  7 years agoPost 16
30636086

rrKey Veteran

Tacoma, WA

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I dont suffer from mental iIlness, I actually enjoy mine!

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12-30-2009 07:50 PM  7 years agoPost 17
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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what is this fuel magnet??

drive a rotary, fly a rotorcraft

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12-30-2009 07:55 PM  7 years agoPost 18
Hellsiege

rrVeteran

Colorado Springs, CO

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Fuel magnet is a sponge type clunk - the thought is even upside down there is enough fuel / more area to absorb fuel that you don't need a header tank. My 600 has had a magnet all season w/out issue. The key was filling the tank immediately and pushing the exhaust gases out of the tank right after I landed. These gases seem to be what eats the magnet. Of course if your using a YS type motor with back plate pressure vs exhaust pressure the magnets will work great under normal use. My experience anyway.

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12-30-2009 11:11 PM  7 years agoPost 19
asm

rrVeteran

California

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An alternative to the fuel magnet is OS's bubble's clank. It works likes fuel magnet, but it's made of all metal instead of foam.

-

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12-30-2009 11:24 PM  7 years agoPost 20
red_z06

rrProfessor

Dumont, NJ

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I did run all header tank during early days of learning. But after switching to Fuel Magnet, I got rid of all the header tanks.

However, I did get few mysterious leaning that was caused by the Fuel Magnet deteriorating and clogging the hole on the aluminum body.

So, adding FM also adds another point of failure without frequent filter change. It has to be changed more frequently for muffler pressure systems.

Now, I use Bubbleless Clunk from OS. While I did not get more than 50-60 flights reliably with FM, I got over 500 flights of trouble free flights with BLC.

So, I do recommand this whole heartedly.

www.JustinJee.com

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HelicopterMain Discussion › Header Tank?
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