The Brison 2.4 is really a strong running engine, I have had no problems at all with them. I just installed a new Brison 2.4 in an 80" D&L Edge 540 I built this winter. The overall weight ready to fly came in at 12lbs 4oz, the Brison pulls the plane unlimited and will torque roll the plane with ease. I have seen a few other 2.4 at my home field and they can handle a plane with a weight of about 14 - 14 1/2 lbs for unlimited vertical with the right prop, over about 14 1/2 you will lose a little. Keep the plane light you you will have a ton of power to spare.

[link=http://www.scottsrc.com/files/dledge36.jpg]80" D&L Edge 540[/link]

Scott