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rhodesengr · 08-26-2013, 10:37 PM

I have one of these Lynx MOAS fuel clunks:
http://www.helidirect.com/lynx-moas-...nk-p-20566.hdx

The problem is it does not seems heavy enough. It weighs about 2 grams and barely bends the Viton tubing I plan to be using (the is for a gasser so silicone is out). Anyone have experience with this clunk? Does it work better when wet or something?

DCflyer · 08-27-2013, 07:18 AM

I think luca designed to work in conjunction with his lynx fuel line.....which is very flexible. If you use the moas with a thick or stiff line it may produce different results. Personally, I didn't like the idea of foam in my tank.

I'm using lynx fuel line and the O.S. bubbleles clunk for my setup. Haven't tested it yet but the clunk/line combo seems to have sufficient amount of flex on initial inspection

marc8090 · 08-27-2013, 09:13 AM

The foam clunks will seem too light when first installed but get heavy when soaked in fuel. That being said, I had unsatisfactory results using a fuel magnet in a Trex 700. They worked great in Miniature Aircraft helis but the inside of the Align tank is not as smooth and would tear small chunks out of the foam and clog the fuel filter.

fastone93 · 08-27-2013, 09:25 AM

The MOAS isn't foam, it is fiber and much better than the foam filters which do not last very long...

I have been running the same MOAS for 8 months (all season) and it is in great shape. It works great, and is designed to be the correct weight when wet. I use the lynx clunk line.

rhodesengr · 08-27-2013, 10:48 AM

I'll try it wet but I have my doubts. Since I am doing a gasser setup, the Lynx silicone is not an option but the Zenoah Viton is very flexible. I have other options but wanted to see what others thought. Getting wet in the same fluid its floating in would not seem to increase its ability to sink. The Walbro felt clunks are much heavier (13 grams) but a very tight fit in the tank hole.

Steve Graham · 08-27-2013, 09:42 PM

When I first saw you were going to be doing a gasser I thought you should be using a Walbro clunk. Then I saw you tried it and it was too big. You might do some research. I have seen different Walbro sizes. What I don't know is how small they make them?

I had 4 or 5 Fuel magnet sponges disintegrate on me. Since I've been using the Lynx synthetic felt I've had no more issues. When wet the clunk will be much heavier. There is a product a few of us have been experimenting with called Tygothane. It is much more flexible and supposed to last a lot longer than Tygon. Much cheaper than Viton.

rhodesengr · 08-27-2013, 11:00 PM

Quote:

Originally Posted by Steve Graham

When I first saw you were going to be doing a gasser I thought you should be using a Walbro clunk. Then I saw you tried it and it was too big. You might do some research. I have seen different Walbro sizes. What I don't know is how small they make them?

I had 4 or 5 Fuel magnet sponges disintegrate on me. Since I've been using the Lynx synthetic felt I've had no more issues. When wet the clunk will be much heavier. There is a product a few of us have been experimenting with called Tygothane. It is much more flexible and supposed to last a lot longer than Tygon. Much cheaper than Viton.

Thanks for all the great info. I went so far as to call Walbro. The smallest body they make is 15mm which is a tad too big unless I ream out the hole. However, my issues is basically solved. Turns out Stens makes a very similar clunk and it is smaller in diameter.
http://www.stenspartsdirect.com/prod...roducts_id=823

I have some on order. I will still play around with the Lynx one just to see. I will look into the Tygothane. Is it rated for gasoline or just the Nitro blend? The Viton is not really that expensive if you get it at tttechnicalhobby. What is kind of pricey is blue fluorosilicone:
http://www.mcmaster.com/#standard-pl...tubing/=o96t62

It is rated for both gas and alcohol and it looks pretty cool. I use it on my return line.

Glenn Goodlett · 08-28-2013, 09:20 AM

I've been using the MOAS in a nitro for a couple of years with success. I use Hayes tubing. If you think it is too light then you could add some weight to it. I have seen people slide a locking collar (without the set screw) onto the tubing which helps clamp the tubing to the clunk as well.

08-26-2013, 10:37 PM	#1 (permalink)
rhodesengr Registered Users My HF Map location Join Date: Dec 2011 Location: Pleasanton CA	Lynx MOAS clunk seems too light I have one of these Lynx MOAS fuel clunks: http://www.helidirect.com/lynx-moas-...nk-p-20566.hdx The problem is it does not seems heavy enough. It weighs about 2 grams and barely bends the Viton tubing I plan to be using (the is for a gasser so silicone is out). Anyone have experience with this clunk? Does it work better when wet or something? __________________ This is your brain on helicopters! Trex 700L, Trex 700N DFC HB gasser,Trex 700N V2 HB gasser, Trex 550X. Spirit or BD3SX

08-27-2013, 07:18 AM	#2 (permalink)
DCflyer Registered Users Join Date: Jan 2013 Location: DC	I think luca designed to work in conjunction with his lynx fuel line.....which is very flexible. If you use the moas with a thick or stiff line it may produce different results. Personally, I didn't like the idea of foam in my tank. I'm using lynx fuel line and the O.S. bubbleles clunk for my setup. Haven't tested it yet but the clunk/line combo seems to have sufficient amount of flex on initial inspection __________________ OXY5 MEG / 12S RAW KSE / 14S TDSF / 6S OXY rep

08-27-2013, 09:25 AM	#4 (permalink)
fastone93 Registered Users My HF Map location Join Date: Nov 2009	The MOAS isn't foam, it is fiber and much better than the foam filters which do not last very long... I have been running the same MOAS for 8 months (all season) and it is in great shape. It works great, and is designed to be the correct weight when wet. I use the lynx clunk line. __________________ Trex 700L Dominator X 2, Trex 450L Dominator X 2

08-27-2013, 10:48 AM	#5 (permalink)
rhodesengr Registered Users Thread Starter My HF Map location Join Date: Dec 2011 Location: Pleasanton CA	I'll try it wet but I have my doubts. Since I am doing a gasser setup, the Lynx silicone is not an option but the Zenoah Viton is very flexible. I have other options but wanted to see what others thought. Getting wet in the same fluid its floating in would not seem to increase its ability to sink. The Walbro felt clunks are much heavier (13 grams) but a very tight fit in the tank hole. __________________ This is your brain on helicopters! Trex 700L, Trex 700N DFC HB gasser,Trex 700N V2 HB gasser, Trex 550X. Spirit or BD3SX

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08-27-2013, 09:13 AM	#3 (permalink)
marc8090 Registered Users Join Date: Sep 2006	The foam clunks will seem too light when first installed but get heavy when soaked in fuel. That being said, I had unsatisfactory results using a fuel magnet in a Trex 700. They worked great in Miniature Aircraft helis but the inside of the Align tank is not as smooth and would tear small chunks out of the foam and clog the fuel filter.

08-27-2013, 09:42 PM	#6 (permalink)
Steve Graham Registered Users Join Date: Feb 2008	When I first saw you were going to be doing a gasser I thought you should be using a Walbro clunk. Then I saw you tried it and it was too big. You might do some research. I have seen different Walbro sizes. What I don't know is how small they make them? I had 4 or 5 Fuel magnet sponges disintegrate on me. Since I've been using the Lynx synthetic felt I've had no more issues. When wet the clunk will be much heavier. There is a product a few of us have been experimenting with called Tygothane. It is much more flexible and supposed to last a lot longer than Tygon. Much cheaper than Viton.

08-28-2013, 09:20 AM	#8 (permalink)
Glenn Goodlett Registered Users Join Date: Feb 2009 Location: Ridgecrest, CA	I've been using the MOAS in a nitro for a couple of years with success. I use Hayes tubing. If you think it is too light then you could add some weight to it. I have seen people slide a locking collar (without the set screw) onto the tubing which helps clamp the tubing to the clunk as well.

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