It was a lot steadier than the tiger owing to the ailerons further outboard and the wider maingear, the result of the wider cabin.
So it had a wider-wingspan - obvious when I think about it and it is clear when I look at pictures of the fuel tank.
So did the Jackaroo have any changes to the tail or did it have a normal Tiger Moth tailplane and elevator?
I remember reading an article by Derek Piggott on test flying a T21 motor glider. The engine had been installed in a new centre section, to which the wings were bolted. He found that the aircraft was now unstable, because there was not enough tail surface area to balance the larger wing area.
Were there any issues with the Jackaroo's handling?