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HelicopterMain Discussion › Header Tank clunk line
01-24-2007 06:41 AM  10 years agoPost 1
Kona Chopper

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Kailua-Kona, Hawaii USA

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Does the header tank clunk line ever go bad? Just curious.



Why buy?? when you can borrow and no return

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01-24-2007 06:45 AM  10 years agoPost 2
Top End

rrApprentice

Darwin

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YES tt Raptors of early needed it doing first up now worries.

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01-24-2007 08:30 AM  10 years agoPost 3
Yug

rrMaster

UK. Herts

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You should inspect it and the main tank line every 2 months

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01-24-2007 08:38 AM  10 years agoPost 4
mdgyro

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Hawkinsville,GA

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Put in a peice of Sullivan fuel tubing. You can get it at Tower Hobbies 2ft for like $1.79. It is the clear tubing they use in their tanks. I have tanks in some planks that are 10 years old and the line is still good.

50% of flying helis is 90% mental

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01-24-2007 02:09 PM  10 years agoPost 5
rc4stroker

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Spartanburg SC USA

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Header Tank

I never had line troubles with airplanes either, but I was using 10% fuel, not 30%. That and leaving fuel in the bottom of the tank makes a big difference to a helicopter.

Neal Hayes
Spartanburg SC

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01-24-2007 03:11 PM  10 years agoPost 6
w8qz

rrVeteran

Grand Rapids, MI - USA

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You can delete the header tank "clunk line" entirely: scroll down to the section entitled "The Stunt Tank design" on:

http://peteshobbies.com/prcp/stuntt...nt_tank_txt.htm

This has been working well for me (although I'm not enough of a pilot to evaluate how good this is for aerobatics).

"The helicopter is much easier to design than the aeroplane, but is worthless when done."

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01-24-2007 03:21 PM  10 years agoPost 7
Yug

rrMaster

UK. Herts

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The pickup from the centre of the header tank works pretty well and overcomes problems like the clunk getting stuck in the corner. Still doesn't overcome the problem of nitric acid degrading the clunk line in the main tank though. The best way round this is to use a crank pressurised fuel system.

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01-24-2007 05:58 PM  10 years agoPost 8
w.pasman

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Netherlands

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If you want to pump empty the header after flying you need a clunk in the header as well. And it HAS to be flexible enough to reach the bottom of the header, otherwise it still won't work.

I hardly ever have to replace the clunk line in the header, if you don't fly the main tank empty the header line will never touch the exhaust gasses that seem the real cause of line detoriation.

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01-24-2007 06:00 PM  10 years agoPost 9
w.pasman

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Netherlands

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The pickup from the centre of the header tank works pretty well and overcomes problems like the clunk getting stuck in the corner
please explain. You had a header clunk stuck in the corner of the header?! That must have been a REALLY flexible line

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01-24-2007 07:09 PM  10 years agoPost 10
Yug

rrMaster

UK. Herts

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It's just a rigid tube. Tried it once just to see how well it worked, however I don't know how well it would maintain constant fuel delivery during the likes of chaos - depends how much air has got into the header.

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01-24-2007 08:15 PM  10 years agoPost 11
raptor lee

rrNovice

Walker, MN U.S.A.

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Unless you're running your header tank empty, its clunk line should last almost indefinitely. The hot exhaust gases are not present in the header tank, and, therefore, the clunk line does not deteriorate. I use regular nitro fuel tubing in my gallon fuel jugs and have had the same tubing in it now for over three years. Hayes black fuel line is excellent for the header tank and main tank. It is very flexible and lasts longer than any other line I've used. In addition, you can use it for nitro or gas. Great product.

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01-24-2007 11:05 PM  10 years agoPost 12
legoman67

rrElite Veteran

Nanoose Bay B.C, Canada

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hmm mine must be a stunt tank too cuz there is no clunk in my header....

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HelicopterMain Discussion › Header Tank clunk line
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