I thought the FAA had accepted the ASTM for gyroplanes. The ASTM standard does allow for a ground adjustable pitch. The gyro can't leave the ground with 0 pitch, so it is ground adjustable only.
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C Baty; Shame on you. It is obvious that the by C30 in question is mounted on the floats at about a 10° angle. It is no wonder with the floats pointing down 10° in level flight would cause a strong nose down force.