Like Rowland l am concerned with the structural integrity of the airframe (motor
mount stressing). Adding 40lbs of ballast adds at least 152lbf to the vertical
inertia loads (at LIMIT condition, n=3.8) and also may pull the local CG (of
the mass supported by the motor mount) forward. Special factors increase this
to 304lbf (ULT, n=3.8, SF=2.0 for composites) into the load-bearing fuselage
structure. Similarly, (but lower) increase in load occurs for side, fore-aft,
etc.
Hopefully some CG calc checks and/or simple config changes will yield a cure.
--------
John Wighton
Europa XS trigear G-IPOD
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