Note, the burning fuel with brownish colour on the head and crankcase
This is my Thunder Tiger Pro 50HR engine. I did some figure of eights this morning with 1850 rpm as set in GV-1. Noticed the engine lost its power and quit suddenly. Landed with autorotation.
Five things in my mind: Pick-up silicon tube in main tank/header tank fell-off?..... Blocked fuel filter?....Blocked carburetor?.... Broken piston ring?.... Broken piston?.... That was the end of my flight for that day!!
At home, I checked the pick-up silicon tube but still ok, by the way I replaced it with a new one. Tube in the header tank was ok as well. Fuel filter not blocked. Also checked the carburetor but no foreign objects found blocking the valve.
Lastly I removed the engine with a surprised. The cylinder head was loosed and all the 6 hex bolt also loosed!!! The aluminium gasket was badly damaged and melted. I thinked it was becaused of the high pressure and super heat from the cylinder exhausted from the leak thus melting the gasket. Now I'm still looking for a new gasket. Or make my own...
Five things in my mind: Pick-up silicon tube in main tank/header tank fell-off?..... Blocked fuel filter?....Blocked carburetor?.... Broken piston ring?.... Broken piston?.... That was the end of my flight for that day!!
At home, I checked the pick-up silicon tube but still ok, by the way I replaced it with a new one. Tube in the header tank was ok as well. Fuel filter not blocked. Also checked the carburetor but no foreign objects found blocking the valve.
Lastly I removed the engine with a surprised. The cylinder head was loosed and all the 6 hex bolt also loosed!!! The aluminium gasket was badly damaged and melted. I thinked it was becaused of the high pressure and super heat from the cylinder exhausted from the leak thus melting the gasket. Now I'm still looking for a new gasket. Or make my own...
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