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I seem to be having a little problem with my planes on takeoff. That's three separate designs now, so I have no idea what's wrong, and in fact I can't see much in common between them. They all have the exact same problem though. On the runway, during takeoff roll, a particular speed comes when the aircraft starts leering of the center of the runway. It should be noted that I am using FAR and I'm not really an expert with plane design, even though i enjoy it. Right coming back to the case, I present to you most recent of these troublesome designs. It is in no way a spaceplane, as one can see by its engine. Hence it was designed with low-speed, low-altitude performance in mind. However, the runawy sideslip is fatal on takeoff, the plane ususally rips off a wingtip, rotates around it and comes to stop, sliding backwards. I have also found a description of it that I've written. Both for RP purposes and as notes for myself in case i come back to it after a longer break:

I have a very frustrating, recurring problem with planes. I cannot get a simple plane down the runway without it losing yaw control and crashing! This has been a problem for me across many versions of KSP. I try tweaking everything I can think of: types/number of wheels, steering on wheels enabled/disabled, wing shape/size/placement, control surfaces size/placement/authority control/deployment, reaction wheels setting/quantity, engine quantity/size/placement, ...and probably more. I've even tried with all three levels of runway; at level 3, the plane seems to take a little longer to start wobbling, but still does long before I reach a speed that will allow take-off. I'm using only stock plane parts (see list of mods below). AAAARRRRGH! I have a Career Mode game with several contracts that require flying around Kerbin, and I can't even get off the %&*@! ground. Specifically, once my plane exceeds ~35 m/s, a yaw wobble begins that only gets worse as my speed increases. Eventually, my SAS cannot halt the swerving, and almost immediately my own keyboard control cannot override the swerving. I swing off the runway and crash. Every. Single. Time. My KSP version is 1.2.1 (updated by Steam), and these are the mods I have: DMagic Orbital Science, Extraplanetary Launchpads, Firespitter (came bundled with USI mods), SCANSat, Tarsier Space Technology, TweakScale, and six USI mods (Asteroid Recycling Tech, Freight Transport Tech, Konstruction, Exploration Pack, Submarine Pack, and Modular Kolonization System). Also, below is a Dropbox link for my most recent plane design if anyone wishes to see it. https://www.dropbox.com/s/pfob9s7m77vrfsa/Exploration Plane.craft?dl=0