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Thrust Line References

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mjk51

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Fostoria, Ohio
Just hung the IO-540 on the fuselage and need to set up the 0-0 thrust line. What is commonly used as reference surfaces for level and plumb ? Do we use the engine case seam, the tops of the cylinders, prop flange?? Maybe some that have been down this road and gotten good results could write up a quick procedure.

Thanks
Mike

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