The ESC stays real cool in the intake duct but the battery gets HOT. I widen the vent in the bottom of the electronics bay and I may put a small hole under the nose to get a little more air to the battery. I have spackled and sanded the top of the Typhoon to get it ready for paint. I think I am going to remove and rehindge the control surfaces, I don't like the gap. I think I am going to get just foamie plane kits without the electronic from now on, I'm pretty much redoing this one.