noamkrief Posted December 3, 2012 Report Share Posted December 3, 2012 Hi everyone. I'm a new rider - 3 month but an experienced Spec E30 (Infineon / Thunderhill) driver and I absolutely love understanding the physics that control cars, and now motorcycles. Looking all over the internet and forums for a simple question "how many lateral G's can a bike pull in a corner" I found all sorts of answers that were all different from each other. I ended up plugging in some basic formulas into excel and compiled some graphs. Here is what I learned: 1) Lean angle of 45 degrees = 1 lateral G. Regardless of tires, speed, or radius. 45 degrees will always produce 1G. 2) If you maintain a 45 degree lean angle and accelerate, your radius will increase. This is pretty obvious. 3) Lean angle vs lateral G's is not linear. For example - your first 10 degrees of lean angle will produce around 0.17 lateral G's. But the extra lateral G's produced by leaning from 40 to 50 degrees is 0.35. In other words - an extra 1 degree of lean when at 40 degrees will result in a much tighter radius change than lest say going from 20 to 21 degrees lean. I could you could also say that at higher lean angles - lean angle becomes more sensitive. The point of all this is that next time you are in a corner leaning 45 degrees, get your big fat head towards the inside just a couple more inches to increase the total system lean by 1 degree - it can make alot of difference in terms of increasing your lateral G's. And when you increase you lateral G's, your turn gets tighter - OR - you can go faster hahaha which would you choose? Unfortunately, the data was pretty disappointing. Specifically, the exponential relationship between lean angle and lateral G's where it seems that only after 60 degrees lean, every little bit of extra lean starts to make a whole lot of difference in lateral G's. Up to around 45 degrees, it's almost linear. It just goes to show me the importance of cracking that 45 degree lean barrier and i'll be able to zip around these turns much faster. But again - a bit unfortunate that bikes can't lean to 60 or better yet - 70 degree lean. PS - when talking about lean angle,we are obviously considering the entire system - bike + rider. If the bike alone is leaned 45 degrees, and the rider is vertical refusing to lean with the bike - you may have an overall system lean of 40 degrees. The following formulas were used for getting lateral G's: acceleration in m/s = velocity² / radius (all in m/s) to convert to G's: accelleration in m/s² / 9.80m/s² = G's The following formulas were used for lean angles: tana = .067*mph²/radius in feet Then you have to inverse tangent of tana and you get degrees of lean angle. I hope this helps someone out there who thinks like I do. I usually have to understand the math and physics behind something before I'm willing to try it in real life. Hope to see some of you at the school in 2013. I'll be attending in las vegas. I know Infineon very well, but wouldn't dare to try it on a bike - at least not yet. Kind regards everyone. Noam Quote Link to comment Share on other sites More sharing options...
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