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MDS .58 Runs Rich

A friend wanted me to post this question concerning his new MDS .58, "Why does it run rich no matter what the needle settings (high and idle) are? It runs fine on the bench, but then will load up and flood out after a short taxi prior to take off. It will sometimes make it through taxi and take off, but then die in the air. Again from too rich a mixture.

He wondered if it might be that the MDS needs a longer break-in period than an O.S. or Saito. He has run about 1/2 gallon through it at present. After three experienced pilots twiddled the needles, checked fuel lines, tank, etc, etc.; it still does not run well.

What has been your experience?

Tom

Reply to
Tom Johnson
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Fuel foaming. The fuel tank is foaming the fuel due to engine vibration. The model vibrates one way when sitting on the ground. When the model is airborne, it is free to shake in a different way, for lack of a better explanation, and the needle valve adjustment made when the model was on the ground was a "false" setting.

Isolate the fuel tank from the model's structure with soft, unpacked foam and the problem will disappear.

Sometimes just balancing the prop is enough to let you set the engine properly. Give that a try first.

Ed Cregger

Reply to
Ed Cregger

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