Yes, I fly my two Bobcats in temps of upto the high thirtys (centigrade !) One has a PST 600r the other a P70. Both cope fine with the temps., but obviously performance is down somewhat and when its really hot the P70 has a better reserve of power. I used to fly one BobCat with a RAM 500 of only 12 pounds of thrust and even that was absolutely fine in reasonable temps. I fly from a short grass field and the model's take off performance is more than adequate, I just don't think you need big engines in BobCats, the wing loading is low enough to take care of that, and the smaller engines have a lower fuel consumption for longer flights. I think a Wren Supersport in any Bobcat would be more than sufficient for any temps. except for those who want outrageous performance.
Your choice.
Regards, David Gladwin.