5 deadsticks in a row - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-11-2007, 06:19 PM   #1
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5 deadsticks in a row

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i am flying a sig kavalier with a thunder tiger pro .46 no problem starting, but it has quit the last five flights after anywhere from 30 seconds to three or four minutes into the flight. changed the glow plug several times to no avail. today there seemed to be no fuel in the line after the deadstick, so i took the tank out and all is well, so i am at a loss here. any ideas or thoughts? thanks, john
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Old 11-11-2007, 06:34 PM   #2
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Check or replace all your fuel lines inside the tank. there may be a pinhole in the fuel pickup line. Iss the clunk still on the end of the fuel line inside the tank?

Could be leaky fuel line betwween engine and tank as well.

Did you notice if it sounded like it was going lean right before it quit?
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Old 11-11-2007, 07:22 PM   #3
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Run the engine up on the workbench and you will know if it is a
tank problem. Could be a line pinched inside the plane.
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Old 11-11-2007, 07:39 PM   #4
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If you had a slightly rough landing, it's also possible the clunk went forward in the tank. Try holding the plane nose up and give it a quick shake or two to see if it can be dislodged.

Just something else to try

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Old 11-11-2007, 08:07 PM   #5
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Three very good suggestions. Sometimes it is hard to check fuel lines for leaks. I have learned to just replace the lines. They need to be replaced periodically anyway. Good luck.

I keep having the same mechanical problem. I've got a loose nut on the transmitter!

G-manz35 AKA. George St.Amant MAAC#75084
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Old 11-11-2007, 08:33 PM   #6
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dead stick

Is this engine new, is it ABC and how much nitro? It probably would like 5% especially if new.
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Old 11-11-2007, 10:37 PM   #7
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My engine was acting in a similar way. It would start, but I has great difficulty getting the mixture adjusted to keep it running. Finally somebody told me that it was probably caused by a piece of dirt stuck inside the needle valve assembly. He showed me how to flush it out like this: 1) remove the needle valve needle iself and pump some fuel into the carb though the fuel line that comes from the tank. Let maybe 1/6 ounce of fuel squirt out. 2) insert the needle valve very loosely simply to block the fuel squirting out the side. Now pump 1/6 ounce of fuel again into the fuel line that come from the tank, except this time it will squirt into the motor. This will flush out the offending bit of dirt. Beware now that the crankcase is flooded with fuel, so you have to get rid of the flood by holding the motor with the cylinder on the bottom, then turning the prop three or four times by hand to make the flood go up into the head, then holding the motor so the exhaust port is at the bottom and turning the prop by hand again to make the flood go out into the muffler.

You have to clear out the flood or else you'll get a hydraulic lock in the cylinder when you use your starter. The fuel is incompressible so if the flood is in the cyclinder then either the wrist pin or the connecting rod will bend when you use the starter.
With lots of practice, you can make it look easy.
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Old 11-12-2007, 05:25 AM   #8
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all valid points

I have a ST 60 on an old astrohog was doing same thing fuel lines,dirt in line all checked still doing it .An old timer in the club suggested a one way valve in the pressure live from the muffler to hold the pressure in the tank at lower rpm,s that worked !! nothing to loose , G
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Old 11-12-2007, 05:51 AM   #9
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Well I take it you do no how to adjust needles..so I skip the important part

If you did the above right.tank and fuel lines are ok.. I put a peace of fuel tube over the highspeed needle. There a good chance you have a air leak.. thats IF all the above is right
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Old 11-12-2007, 07:31 AM   #10
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I have this engine also and it runs great. This is a well made engine. I would lay money down that there is a fuel supply issue. Here is what I suggest:

Throw the tank away and put a new one in. (they're cheap)

Replace all the fuel line.
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