Hi Xantos

Just ran a couple of quick numbers here on your temps and altitude. I wouldn't consider any engine under 25lbs thrust. The temperature is more a factor than the altitude. To get 17lbs of thrust at 38C, you'd need to start with about a 22.5 lbs thrust motor. So that would limit your list to the P120 and the PST 1300R. You may also want to consider either the Simjet 2300(25lbs) or 3000(30lbs).

Although the supersport is a great engine, it's thrust output would probably be in the 13-14lb range at your temps and altitude. Which would still fly the Bobcat well, but may not give you the power margin that you'd like or possibly need.

Good luck with your choice.

Ed