A further two-month delay ensued when it was discovered that the centre of gravity was not as designed and several items of equipment needed to be relocated to obtain the correct balance.

These showed that performance was lower than the designer's predicted figures and, while it met many of the requirements in specification AC34, the Warrigal I had handling problems which made it unsuitable for use as a trainer.

Wackett was dismissive of the final report on the trials, claiming that the results were qualitative only, lacking a "recognised or rational system of observation or measurement".

Drawings for the Warrigal II were submitted to the Air Board in August 1929 with the explanation that all defects found in the first aircraft had been rectified and that construction was well underway.

Due to the lack of spare parts and the cost of repairs, the Air Board recommended that the aircraft should be written off, the Minister for Defence giving approval for this course of action in November.

Flight testing of the Warrigal II commenced in September 1931 and were completed in February 1932 when an inspection revealed that the joint between the front and rear sections of the fuselage had weakened and opened up.

[12] By March 1933 after a total flying time of 37 hours and 15 minutes the Warrigal II was unserviceable again and Wing Commander H.F. De La Rue (C.O.

This was approved by the Minister for Defence in July, and following the removal of the engine and instruments the Warrigal II was donated to Melbourne Technical College for use in the teaching of aircraft design.