I had my Brisson 2.4 in a World Models Extra 300S at 16 lbs. It flew good. Not quit unlimited vertical, but close. It would hover at about 1/3 throttle and pull out slowly.
I just wanted more power( didn't need it) so I went to a ZDZ 50. Same weight more power. I also had the 2.4 in a 14lb plane and it was a rocket. Used a Bolly 18 X 10 or a 3W 20 X 8 with good results.
I hope this helps.