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Gyrocopter aerodynamics

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  • #16
    A couple of points worth mentioning. All the parameters depend entirely on the efficiency of the design. Given that both side x side and tandem are well designed, then the AUW of a gyro is not dependent on the configuration. The weight of a s x s can well be lighter because the extra length and strength required for a tandem, plus the extra rudder volume required to offset the extended nose. Another consideration is that most tandems have steel main frame which is of course heavier than Aluminium.

    The little extra drag from a wider fuselage is comparable to the extra drag from the longer profile drag from the surface area of the tandem. The profile bottom surface area of both are similar, so the tendency to “float” on landing would be similar. The main problem with a s x s is that many owners want to carry the ‘kitchen sink” with them which of course makes them heavier. Heavier equals higher rrpm which takes longer to decay on flaring for landing, giving the illusion of floating, where in fact it is just simply still flying until the rrpm decays enough such as it can no longer support the aircraft, and it gently touches down. This is a correct gyro landing, sinking it on and not flying it on.