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HelicopterTurbine Helicopters › Clunk line's....
01-01-2010 07:01 PM  7 years agoPost 1
Jamien9

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Ashford, Kent, UK

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So what is everyone using? I have been using tygon 3mm ID thin wall clunk line in both main tanks and was assured by the retailer that after a while in the Jet A1 they would go really really soft; so much so that they had to be wired to the clunk and tank outlet or they would fall off. This hasn't happened; in fact they are still as hard as when they came out of the packet. This is causing us major issues with 3D flying as they are just not flexing like they should and allowing quite a bit of air in to the UAT. We have run about 10 litres of fuel through them (if not more) and also left the tanks full for around a week to see if this would soften it up, but no, still very hard. I have my suspicions that the clunk is actually bent over in an arc mainly because it was wrapped in a coil in the packet, so I've currently got the unused stuff hanging with a weight on it to try and straighten it out, but i still dont think it's going to soften up like it should.

We desperatly need this sorting as it is really holding me back when flying it as im constantly having to check for air in the UAT and hold back on the 3D stuff which is a shame as this is the main thing it was built for.

Thanks in advance,

Jamie

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01-01-2010 08:03 PM  7 years agoPost 2
dazzaster

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right next door to hell

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if your doing 3d with a turbine then you will nedd to change your clunk a lot more often than you would with a nitro.
if you need to straighten it out or soften it up after takeing it out of the packet then place it in hot water take it out and hold it straight as it cools down. not sure if the hot water method would work on tygon thats gone hard from being used with fuel to get it to go soft again?

A.K.A 509

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01-01-2010 08:06 PM  7 years agoPost 3
Jamien9

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Ashford, Kent, UK

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It's not gone hard, it just is too hard. I need something softer from the offset, or perhaps heavier clunks?

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01-01-2010 08:14 PM  7 years agoPost 4
dazzaster

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right next door to hell

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the most heavy clunk i use is from vario (sold with there fuel tank for turbines) or you could use a couple heavy nuts by takeing off the klunk slide a fuel tube clam over the clunk line (the metal spring type) then slide the nuts over and replace the klunk then slide the clamp back towards the clunk to hold the nuts up againt the clunk?

A.K.A 509

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01-02-2010 01:13 AM  7 years agoPost 5
seattle_helo

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Seattle, WA USA

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JetCat offers a large, heavy metal & felt clunk. The part number is 21105-09. They have a small picture of it on page 41 of the 2009 catalog. I have one of them and it's big and heavy but I'm not sure how it compares to the Vario piece.

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01-02-2010 04:57 AM  7 years agoPost 6
heliman53

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Charleston, Sc

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In the two main tanks I use the large Vario gasser clunks and regular yellow i/8" Tygon. In the header tank I use a Vario clunk with a paper carb filter J B welded on for bubble prevention works great even during aerobatics. Craig B

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01-02-2010 10:00 AM  7 years agoPost 7
Jamien9

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Ashford, Kent, UK

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Thanks, just found a jetcat metal/felt clunk on the motors and rotors site, will give that a go. Failing that, will have t find a way to make them heavier still!

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01-02-2010 04:48 PM  7 years agoPost 8
lperagallo

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Westfield, Indiana, USA

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In the tanks I use the Hayes black line with a normal heavy clunk. The tygon gets stiff pretty quickly but the Hayes works fine. That line works well for aerobatics. It is also OK in Kero. I use a BMV UAT so there is no line to use inside the tank.

Lou

Twin Bergen 44Magnums FBL Wren NW44s - Kero start

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