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Discussion
Need help with Saito 56
I have a Saito 56 that is giving me a problem that I cannot figure out. The engine is mounted upright. The engine runs perfectly with the plane sitting on the starting table. Good idle and good response through the throttle range all the way to full throttle. However, when I try to fly the plane, the engine dies after about 100 ft. of the takeoff roll. This plane had another engine on it prior to the 56 and it ran just fine so I feel the fuel tank and plumbing are not the problem. I did check the tank and all is just like it is supposed to be.
Anyone have any thoughts on why it shuts off on the takeoff roll but runs great with the plane sitting on the table or ground? I have tried retuning every way I could think of. Nothing has helped. Bill Hodges |
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Can you raise the nose of the plane while on the ground and make it die?
Is this a .56 glow engine or a 56cc gas engine? It sounds like a lean high end. I am sure others will chime in with more knowledge on this particular engine. |
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Pamster: It is a 4 stroke glow engine. I have not tried raising the nose. Will try that tomorrow if it is not raining. I have richened the high end till the engine started to sag. That did not help.
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If richening the high end didn't help and you can't even get off the ground I am suspecting a fuel tank problem. You said you checked it but how I guess would be my question.
Perhaps you should post more info on the plane itself. Was this plane yours that had a different engine on it before this one? Is this plane just new to you? Did you know the previous owner? Are you sure the tank plumbing lines aren't reversed? Forgive me I don't know your experience level. You have been a member here for a long time and may very well know more than I do so I am just throwing some thoughts of mine out there. I am sure other will chime in here as soon as they are done shopping at Walmart. Lol. |
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I've never gotten the vent and feed line mixed up on a glow engine. (insert smiley face)
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Pamster: I have been building and flying model aircraft for 62 years. The plane is a "Not For Sale" that I built from plans. The fuel lines are not reversed. The tank is the same one that was connected to the previous engine and that engine ran fine. I have checked the lines for leaks and found none and the clunk is in the right location. I do not think the tank is the problem.
I am going to the field tomorrow if the weather allows. Supposed to rain. I am going to try raising the nose like you said and see what happens. I am also going to try fattening up the top end a little more to see if that helps. Wish me luck. Bill H. |
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Quote:
I learned early on that if a glow engine won't run on the ground at full throttle when pointing up at 45ish degrees angle, it will die shortly after take off. Nobody wants that. Point being, a properly tuned glow engine will operate in this way. And I do absolutely wish you good luck with calm winds and sunny skies. |
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Just a thought...
I’d take the tank apart one more time and look for a pinhole where the pickup line attaches to the brass tube. Stretch the fuel line and look for the pinhole. I have a Saito .56 that did me that way and that’s what I found.
Other than that, fresh fuel ( 15% synthetic) OS “F” plug and a APC 12x6 is my combination of choice. My engine has about 2 gallons through it and is generally a reliable “sewing machine.” (The pinhole was caused by a sharp burr on the brass tube.) Good luck. WT |
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Thanks WT. Already did that. No holes in the tubing.
Bill H. |
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I have a very used Saito.56 - great engine.
It only has shut off in flight when the tank goes dry. Already changed bearings a few times and the camshaft once. Rings on the next dissasembly, it is still strong. Adjust the valves, I do it once each year. Plugs do wear, I change them when the coil becomes "whitened". I set the high needle with a tach, a few hundred RPMs rich from peak. (EACH FLYING DAY!!!!) Low speed needle for a consistent low idle, with a little "burble". If I need to "touch" the low speed needle, it is a common sign of the plug wearing out. APC 12x6 or 11x8 Re check fuel lines... ..you never know. At full throttle you point the nose up and the RPM should stay steady. Watch for dirt in the high speed needle, I always have a filter between tank and carb. It is a common problem with leaning engines. Take the needle out and "squirt" some glow fuel direclty through the fuel inlet with the can pump. I've seen engines "pop" a clog of dirt at the field a few times....!!! Good luck. |
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Bill there are a few "Not for Sale" planes at our field. Very neat little aerobat! My only hiccup with at Saito is one a few years back I bought used. I mistakenly thought it was broken in and just had a hard time with it getting it to run right. Put it back on the test stand and ran a few tanks through it per break in procedure. Ran great after that. It was newer than I thought. Moral- make sure the engine is broken in enough before trying it on a plane. If its an experienced engine, then disregard this post. I'm sure you'll have it figured out soon.
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