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Barnaby Wainfan explains the challenges designers face in creating viable STOL aircraft.

Months of repair work netted Bill Repucci a new, more powerful engine for his RV-9. The increase in horsepower brings with it a shift in CG and handling characteristics.

Flight testing for longitudinal stability problems continues this month as columnist Barnaby Wainfan details tests for stick force as related to trim and stick-free stability of an aircraft. The object is to gather data and analyze it to see if the hypotheses about the nature of the problem hold up under scrutiny.