Gentlemen, to throw a wrench into the discussion..........how about in a full size military cargo plane such as the C5B Galaxy the total maximum thrust from all 4 engines is 172,000 lbs. of thrust and the maximum take-off weight is 840,000 lbs. for a thrust to weight ratio of 20%..........or 1 lb. of thrust for every 5 lbs. of airplane. The takeoff roll though is 8,000 feet.....but hey they climb to a cruise altitude of 30,000 feet. Our RC airplanes for our yank and bank kind of flying really requires the high thrust to weight ratio that our model engines/motors provide with our balsa and foam airplanes. Never mind that in full scale airplanes...........they seem to be at first glance "underpowered"...........but hey they fly........but not in our model plane high energy loops and climbs. 'Nuff said. Larry.