Thread for context this question came up in: http://ecomodder.com/forum/showthre...l-economy-tonneau-cover-124-6.html#post535358 I'm guessing we will want the answer in pounds, perhaps FT/Pounds. Ballpark numbers on horizontal, vertical and or down-force and or lift. Just need a general idea for discussion purposes if you can please. Comparisons in laymen terms would be very useful. My guess is that such a plane would experiences forces similar to a football tackle between some 120 lb kids. Not very useful, very subjective but it gets an image across hopefully. Let's put it this way, if you have ever built something and sat on it, pulled on it, or jumped on it to test it before mounting, then you know what I mean. We are talking backyard engineering where one can just throw more parts and material on something until it feels right. Just short of the "hold my beer and watch this" approach.