I was ( was ) running a tower .46 in mine and it was unlimited vertical all I can say is- WOW-!! was doing a low inverted pass and pulled out the wrong way and clipped my wing on the ground and took it home in toothpicks But I've got another one sitting right next to me ready to be put together . with this set up it weighed in at 3.75 lbs. i was using a 10x7 and 11x6 prop and had to keep bending the landing gear to give me proper groung clearance, luckily I have blacktop to take off of