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HelicopterEngines Plugs Mufflers Fuel › Time of the season to replace the clunk line.
01-14-2003 06:30 AM  15 years agoPost 1
rickc

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Creve Coeur IL. (Peoria Area)

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For all of us that the weather has us doing too much flying on G2 and not enough of fuel burning I would suggest doing a little preventative maintenance on the machines while their benched.

Replace the pickup line inside the tank; nitric acid (a byproduct when nitro burns) can deteriorate the fuel line in as little as 4 gallons of fuel. I have had this problem happen two times in two seasons. I use standard sized AeroTrend tubing with a heavy clunk. Two times now my line has turned to almost what resembles sand or small grit. Needless to say the clunk has fell off and the engine died, the first time I was in the inverted part of a roll. I was able to auto in both times but still I would of rather had some warning the engine was going to flame out.

Each time was at the 5 gallon mark for the season, just thought I would pass this along. If you have any free time pull the tank and replace the line. This seems only an issue for muffler pressurized systems and the higher the nitro the higher the percentage of the attacking nitric acid. I have not experienced this in any of my YS setups.

Rick

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01-14-2003 01:11 PM  15 years agoPost 2
Doug

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Port Saint Luice Florida....

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The exhaust is what does it for sure. If you "purge" your tank after each days flying no deterioration will be noticed. (I still change it twice a year)

First member of Member of Bearings Anonymous

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01-14-2003 01:20 PM  15 years agoPost 3
z11355

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New England

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another excellent reason to fly YS engines.

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01-14-2003 01:27 PM  15 years agoPost 4
G.Man

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Bristol

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or other engines with a pump

Don't Email me as I wont reply - PM Only (spam countermeasures)

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01-14-2003 01:31 PM  15 years agoPost 5
z11355

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New England

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absolutely.

once you buy the OS91, the pump, the spare
OS61SX (so you can steal the 60B carb),
the Hyperhead, and rebalance the crankshaft,
you have an engine that almost outperforms
the YS.

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01-14-2003 03:11 PM  15 years agoPost 6
rickc

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Creve Coeur IL. (Peoria Area)

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If you "purge" your tank after each days

I'm afraid purging will not prolong the life of the fuel tubing. I never leave fuel in my tank at the end of a day. I always drain my tank and then start the engine to run out all remaining fuel in the line and engine.

Rick

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01-14-2003 07:50 PM  15 years agoPost 7
Steve Campbell

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Baton Rouge, LA

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Try the Prather pink line. It will last much longer than the Aerotrend.

But you're right; it still needs to be watched closely.

Steve

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01-14-2003 07:57 PM  15 years agoPost 8
miataguy

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Santa Barbara, CA

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Just had this same problem. Even if the tubing has not totally disintegrated yet, you could still have a problem. Once it starts going soft, it is quite susceptible to being squeezed shut by the intake pressure of the engine drawing up the fuel. That's my theory anyhow. No fuel means dead engine and I did a very nice nose-in sliding auto to save it. So new clunk tubing in my header and main tank, then see how it works!

Official RunRyder Googlewhacker!

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01-14-2003 08:57 PM  15 years agoPost 9
rickc

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Creve Coeur IL. (Peoria Area)

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Prather pink line

I'll check that out Steve. I know Prather is a boat manufature, the pink line must be for high nitro fuels. The boats run around 60% nitro I believe. I'll see what the LHS can do. Thanks for the tip.

Rick

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01-14-2003 09:37 PM  15 years agoPost 10
Steve Campbell

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Baton Rouge, LA

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Yup, rickc, that's the deal. It's made for that high-nitro stuff.

Steve

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01-15-2003 03:44 AM  15 years agoPost 11
GMPheli

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W. Bridgewater, MA USA

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Are any of you guys that have had a clunk line deteriorate using aluminum tubing in your tank? I always susbtitute aluminum for the brass stuff, and don't use brass clunks cause the fuel reacts somewhat with brass. I have never had a clunk line fail. My oldest heli is over 3 years old. I don't do anything special, I run muffler pressure and drain the tank at the end of the day. Just wondering if maybe the brass is somehow causing it.

Alan Angus

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01-15-2003 03:48 AM  15 years agoPost 12
rickc

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Creve Coeur IL. (Peoria Area)

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The only metal in my tank is a KSJ heavy clunk.

Rick

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HelicopterEngines Plugs Mufflers Fuel › Time of the season to replace the clunk line.
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