The Ikenga, Cygnus 21T was an evolvement of the Cygnus 21 autogyro . The major change in this version was the addition of a fixed tailfin and twin all-flying rudders to increase directional stability. It was determined on Cygnus 21 that additional rudder surface was required and that it be placed in the prop stream, so as to assure directional integrity in low speed flight as the engine torque could become a destabilizing factor.

A sixty-inch, three-blade, ground adjustable propeller proved the best as the various prop fans tested did not give the required minimum static thrust of 310lbs. Weighing 295lbs., Cygnus 21T flew twenty-four foot aluminium rotors as opposed to the all composite rotors used on the Ikenga 530Z and WindDancer aircraft.

For a number of months we worked with intelligence gathering equipment supplied by SWS, Inc. in an effort to introduce the ship to the security establishment that this company supplied; examining the feasibility of video downlink from an autogyro platform.