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Another Old Plane Being Brought Back To Life

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Another Old Plane Being Brought Back To Life

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Old 09-06-2019, 06:01 PM
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AllModesR/C
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Default Another Old Plane Being Brought Back To Life

Being the sucker I am for older unwanted planes I found a deal too good to pass up a couple of days ago. I brought this and a very minty Hobbico Avistar. The best part of all is that this has a Super Tigre 40 in it! Surprisingly the engine was not frozen from sitting who knows how many years. I poured some fuel down the glow plug and carbs holes, spun it around a bunch of times, and went to start it. It rumbled right up but will only stay running if I spray fuel down the carb hole. For some reason it is not sucking fuel from the tank. If I disconnect the line then fuel does pour out the tube meaning the problem probably is not the tank. Any ideas?

The radio system is a mid 90's Airtronics Vanguard identical to the one that come in the Aircore that ended up being a failure that simply can not fly due to weight, overpowered engine, or both. I charged the batteries and the radio system works like new. Despite this, it probably isn't wise to try flying the plane with such old batteries? What do you all think? Since I know the radio works I have no problem with purchasing new TX and RX batteries. I even got a tachometer (that I really needed) and all sorts of other goodies with this deal. I feel like a kid at Toys R Us again with these lovely machines.


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Old 09-07-2019, 07:27 PM
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3 years is a good rule of thumb for NiCd batteries. Send the ones you have to a battery recycler, not the trash can.
Chances are the o rings are bad in your engine. I replace mine every year, so there's no doubt you'll need new ones.
You should definitely replumb the tank. The soft parts do harden over time and cause leaks.
To verify your radio, put the antenna down and walk 30 paces. Have someone check that there is no unwanted servo movement, first with the engine off and then with it running (to see if vibration causes problems)
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Old 09-07-2019, 07:53 PM
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The engine isn't drawing fuel from the tank. I took out the tank today and the line that goes to the muffler was completely rusted solid inside. I replaced that part and threw new fuel tubing on yet the issue is still there. The engine runs if I continuously shoot fuel down the carb hole but won't draw on its own. I took the carb off today and all the orifices are clear as I poked through them with a needle. Where exactly are these O-rings? I know the carb has one where it attaches to the engine.
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Old 09-08-2019, 06:51 AM
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If you haven't already, verify that you have free flow from the tank. The solid lines that pass through the tank stopper can clog with old residue. I take a length of spare tubing and attach it to the muffler pressure line and blow into it to make sure fuel is passing freely out of the supply line. Sometimes the weighted "thunk" on the supply line in the tank has a fine filter in it.
Nice finds! I too am a sucker for old airplane stuff nobody wants. I have to be careful and not go looking for it or else I`d get into real trouble.
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Old 09-08-2019, 07:14 AM
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Originally Posted by Stickslammer View Post
If you haven't already, verify that you have free flow from the tank. The solid lines that pass through the tank stopper can clog with old residue. I take a length of spare tubing and attach it to the muffler pressure line and blow into it to make sure fuel is passing freely out of the supply line. Sometimes the weighted "thunk" on the supply line in the tank has a fine filter in it.
I removed and took off the carb last night and took it part for an overnight fuel bath and now I at least am drawing fuel. Still won't run on its own. I'll keep tinkering with it. These ST carbs really are engineering marvels. The precision and smoothness is amazing,
Nice finds! I too am a sucker for old airplane stuff nobody wants. I have to be careful and not go looking for it or else I`d get into real trouble.
Absolutely. I decided to stop browsing Craigslist for RC stuff because these planes will overtake my house soon. :-) Everyone wants electrics now so it makes sense. I personally prefer glow. Constantly removing and charging batteries is annoying to me. Plus the realism, including the smoke, from ICE can't be beat.
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Old 09-08-2019, 09:00 AM
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I would buy a new tank stopper kit with new tubes and clunk. Would also replace all of the fuel lines. if you use clear tube to carb, you see if there is fuel in the line. I would start with 2 1/2 turns out on the needle valve.
If you hold your finger over the exhaust hole and flip the prop a few times, fuel should be pushed to the carb. Same thing if you hold your finger over the carb hole, the engine should suck fuel up to the carb. If the tank has three lines, then the vent/filler line must be plugged to work correctly. I had an AvisaStar and loved it! Great flying airplane.


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Old 09-09-2019, 10:44 AM
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A ST carb has 3 o rings. There is one on the LSN, one on the HSN, and one on the intake (bottom of carb). The intake one is by far the most common to leak and usually needs to be replaced at least annually, sometimes more.
I agree on completely replumbing the tank. All those soft parts are good for about 2 years max. I put new lines on all my tanks annually as a part of routine maintenance and new stoppers every other year. I could probably get away with less often, but those parts are cheap and can cause so much havoc when they leak.
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