I did some experiementation today with props. All were on the 10.15 gear set:

22X18 front and rear. Nice slow pace and slightly more braking than mixed props. Very high pitched "whiney" sound which I didn't like.

Mixed props. Awesome all round set up. Gorgeous sound, totally different to the 22X18's.

22X20 front and rear. Bloody ballistic! Plenty of speed for even the windiest conditions that we would get asked to fly in. Nice quiet set up, different sound to the above two set-ups again, but nice. It was much more noticeable that the batteries were beginning to fall away towards the end of the flight (was flown in a fairly stiff 90 degree cross wind). With the new TP 5000 65C this would be a truely magnificent set up for high winds.

Angus