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khp

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Posts posted by khp

  2. Downshifting While Braking

    in Cornering and Techniques

    Posted

    Eirik,

     

    These were ordinary riders, coming to a traffic safety course like the ones that NMCU does. Not just "splendid" riders. Sure, this was during braking drills in a closed area. We encouraged all riders with bikes equiped with ABS to brake so hard that the ABS engaged, so they got comfortable with how the bike/ABS system reacted. Once they could do that, we encouraged them to back off just enough for the ABS to not engage. I had many students volunteer to me that they were surprised that they got a shorter stopping distance without the ABS engaging. One student told me that his Triumph Owner's Manual claimed that this was "impossible" and the manual encourage the rider to alway rely on the ABS.

     

    :rolleyes:

  4. Critique Me

    in Cornering and Techniques

    Posted

    Yeah I have been trying to correct that myself but in the heat of the moment I forget about it lol. The body position part I am still working on, I was told to pivot my hips a little more towards the corner so I can drop my upper body down more so that makes sense.

     

    I forgot what the hip flick is.... :(

     

    IANAC (I Am Not A Coach), but turning your hips into the corner (so the inside hip is more forward than the outside), is not the way CSS teaches it - you should keep your hips perpendicular to the bike.

     

    The Hip Flick is used when you want to move quickly from side to side of the bike, and you have a bit of time to set it up. S-combinations are obvious. You start by hanging out to one side (say, Right), and once your have leaned the bike in, you move your pelvis and lowe body over to the other side (here: left), while keeping the upper body/torso on the right side. When you come to the RP where you want to change to left-side hangout, you only have to transition your torso to the left before making the steering input. This requires some practice and, in my experience, flexibility.

     

    I hope I haven't scr*w*d up the drill and explanation too much.

  5. Critique Me

    in Cornering and Techniques

    Posted

    From the camera position, I guess you are mostly looking for critique of your body position.

     

    I noticed a couple of things:

    First, when you transition from one side to the other (like in the S-combinations), you lift your butt off the seat (e.g. @3.35) - try to slide it over the seat instead (I'm guilty of this sin).

    Secondly, it looks like that you are either hanging too much off, or you are not getting your upper body enough to the inner side, so your body becomes twisted (yeah, I'm guilty of that too). This could be due to the relatively low speed that you're running with on this course.

    At level 3 there is a drill called the Hip Flick. Do you think it could be useful for you in the S-combos?

     

    A third thing I noticed on a couple of occasions is that you only accellerate when you're almost straight up, but this could easily be deliberate due to the amount of traffic and passing rules on the day.

    It also seems to me that you don't use the full width of the course. From the video, the course seems rather bumpy, so this may be the 'correct' thing to do here.

     

    Hope this helps, and let me know if you need further explanations.

     

    Kai

  6. Downshifting While Braking

    in Cornering and Techniques

    Posted

    I don't cruise about, only own a race bike and BIR is a fast course....not the track you want to learn clutchless downshifting on when you are coming out of turn 2 in 6th gear and braking/ downshifting for turn 3.

     

    I think my bigger issue is I am coming up to my corner and I have my braking point established, I apply the front brake but I don't downshift until roughly halfway to 3/4 of the way through my braking so now I am almost to my turn point and rushing to grab gears which further increases my timing mess up and coordination because now I am trying to accomplish too many things at once.

     

    Didn't you self-diagnose right there?

     

    If you feel rushed, back a bit off like on the CSS drills; build the right technique in at a lower speed and only then increase the speed.

     

    What about trying to start down-shifting about 1/2 half through the braking? would this make you feel less rushed?

     

    Downshifting before braking (without a slipper) would send the engine into a lot of RPMs, and possibly over-rev it (or lock up the rear wheel).

    Does this sound right to you?

    I think that this article by Keith is exactly what you need: Brake/down.

     

    Kai

  7. Race Tracks You Have Been On?

    in Cornering and Techniques

    Posted

    Stroker: have you ever been to the Nordschleife?

     

    There are several (compounding) issues:

    - Lack of runoff

    - 3-high Armco

    - Mix of anything from the Ringtaxi (BMW M5 with pro driver for hire; look up Sabine Schmitz) over locals that do 100+ laps per year, sportscars-with-plates to tourist busses going 40kph on the same strip of tarmac.

     

    Just the death-accident rate of at the Nordschleife should tell you that it's very very dangerous.

    Read this warning page from Ben Lovejoy's Nurburgring page:

    The Ring is an incredibly unforgiving place. With the exception of a handful of bends, there's no run-off: if you fail to make a bend, you're going to hit something hard. Worse, most of the bends and crests are blind, so the chances of one accident leading to a second one are also relatively high.

     

    I personally knew Joerund Seim who was killed there - he's the one that was killed in the oil-spill mentioned on the warning page (he slid in oil others had spilled).

     

    I had a car in front of me let out an oil mist, which causes the rear tyre to go sideways on me in one of the turns (the one before the carrousel).

  9. Race Tracks You Have Been On?

    in Cornering and Techniques

    Posted

    I think we went through this some years ago, but I'll have a go anyway:

    Denmark:

    Jyllandsringen

    Ring Djursland

    Norway:

    Våler

    Rudskogen

    Sweden:

    Anderstorp

    Ring Knutstorp

    Sturup Raceway

    Gälleråsen

    Kinnekulle Ring

    France:

    Circuit Val de Vienne

    England:

    Silverstone South

    Germany:

    Eurospeedway Lausitzring

    Nürburgring Nordschleife (not a racetrack, imho - far too dangerous for that)

    Czech Republic:

    Autodrom Most

    USA:

    Willow Springs ("Big Willows")

    Streets of Willow Springs

     

    All accumulated over the last 15 years or so.

  10. Downshifting While Braking

    in Cornering and Techniques

    Posted

    On my 2013 Yamaha R6, if I dump the clutch without blipping the throttle, my rear end locks up momentarily. I guess the r6 is one of the bikes that has a bad slipper clutch.

    If you search the R6 forums you will find lots of complaints about the clutches not slipping as easily as they should. There is some kind of simple DIY mod that can fix that. Not sure if this applies to the 2013, but on older R6s it was a really common modification for track use. Do a google search and you will find it easily.

    I had the same experience with my '08 R6 as noamkrief, and as YellowDuck says - it's a common grief (no pun intended). I even mentioned this to a Yamaha dealer, and said that I should get an aftermarket slipper for racing - which I did.

    Made a heaven of difference on the slipping action. :)

  13. Twist 1 Movie.

    in Cornering and Techniques

    Posted

    Will there be a third book or even a video series of some sort?

     

    The third book would be the soft science one...

     

     

    I think its Andy Ibbott's book.

    Incorrect. The Soft Science of Roadracing Motorcycles is written by Keith. Andy Ibbott's book is called Performance Riding Techniques.

  17. What's Your Goal?

    in School Questions/General Discussion

    Posted

    First, getting to ride a bit (both road and track), which means "outside of China" should anyone be in doubt smile.gif

    Secondly, keeping the rubber side down ALL YEAR! (grumble).

     

    Thirdly, get better at explicitly identifying RPs instead of relying on my intuition.

    Fourth, be more greedy on the throttle roll-on (now that I got an idea of what it takes to get the rear to slide, thanks to Jon and Johnny).

     

    Fixing my racebike would be nice too, but won't happen the next twelve months since it's in storage.

     

    Well, the bike refused to start after fourteen months hiatus, so the only thing I can reasonably claim is to keep the rubber side down. Another twelve months of hiatus awaits the bike - and me :(

  18. Specific Practice Days

    in Cornering and Techniques

    Posted

    I learned to brake to the limit back in 1980 when I first started riding by practicing in two distinctly different manner:

     

    1) Admire beautiful girls I could never hope to attract instead of watching the road (and sometimes admiring my own reflection in shop mirrors, I'm ashamed to say), demanding lots of emergency braking as not to run into the back of stopped cars, and

    2) by running at my bike's top speed (50 mph, restricted by law) until the very last minute before hitting the brakes when coming up to stopped cars or intersections. The goal was to have a margin of between one half and 3 feet only.

    I

    I still practice full stops every now and then to keep the skill alive, although I no longer use either of my previous tactics ;)

    Eirik, If you've stopped looking after beautiful girls, I'm gonna be seriously concerned for you :P

    </p>

    Kai</p>

  23. Quick Turn

    in Cornering and Techniques

    Posted

    Thanks for the explanation, Eirik. but I'm still having a hard time understanding how he can change direction without the front wheel on the ground? - moving body mass from side to side doesn't do much for steering.

     

    Maybe I've just been away from riding too long :blink:

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