liveforphysics wrote:In 2 wheel roadracing, being low is a disaster, and having a higher top speed down the back half of the straight has a tiny, roughly useless difference in laptime.
Luke, that statement is hilarious coming from you my friend!
You had a 15 mph advantage over Paul down the straight,
And what did it get me? I would pass PaulD down the straight, and then he would pass me back in the twistys, and I would exit a few seconds behind him and struggle to try to pass back before the end of the straight. I could accelerate perhaps 3x harder than he could, and it was only worth anything for a 4 second period out of the 81seconds it took to go around the track.
I think in the 1000 watt class most would probably top out at 30 mph. Having a huge aerodynamic advantage after 20 mph will allow me to disappear like you did on the straights. Then if I could hit 40 mph before braking, I could probably gain a position or two on each lap, everything else the same. If that isn't a huge advantage, I don't know what is.
When you get your speed increase from aero rather than power, your F=MA is the same, so you only start to have an advantage as your speed gets very high, which it climbs up as slowly as anyone elses speed. This means the time when you get a bit more speed is at the end of the straight, which is exactly the LAST PLACE you want to have a bunch of speed, because the total time you get to travel at that speed is #1 only a second or two at the most, and #2, you have to start your braking zone sooner than anyone else, which is a prime point for getting passed back if you managed to use that 2 seconds of improved speed to do anything with it.
Look at it this way, if you can come off a corner exit at 5mph faster, you carry that 5mph advantage for the entire straight away, like perhaps 10 seconds or whatever of having a 5mph advantage. It shaves more time off your laps as getting a magical 25mph speed advantage for the last 2 seconds by a HUGE margin, because it doesn't have a large effect on your braking point.
You will ALWAYS be faster if you can do anything to exit a corner at a higher speed, or to be able to accelerate hardest when you're at low speeds, just having exited a turn, than to be able to pour on power or a big speed advantage toward the end of the straight away.
If you look at drag racing the importance of accelerating early becomes painfully clear. If I run the whole quarter mile, I may get a 11.0 at 115mph. If I run just HALF WAY down the track and then coast to the quarter mile, I run an 11.4 at 105mph. If I put on street tires so I get a shitty 60ft time, I run a 12.0 at >120mph.
I understand having your weight forward ( to a point) but high I'm not understanding. Picture of a lowracer:
Looks pretty high and forward to me.
Perhaps too forward? Heck, if it starts to endo too much, just stick a leg out!
What about something like this:
Did you see the couple of gas guys trying to ride low-racer bikes around the track??? It's just painful to watch. It's simply impossible to turn well on 2 wheels when you're low, and extremely impossible when you're low AND long. They had hot engines, and were getting creamed by recreational riders pedaling along leisurely. For an opposite perspective, did you notice Zombiess riding the tiny short wheel base childs bike with a massively raised handbar and seat, so it looked almost comical? The guy MOWED THROUGH bikes in the corners, massively higher exit speeds on a machine with relatively low power, and it performed really really well. You don't want your wheel base a bit longer than you need to enable you to use the power you've got without wheeling over backwards. My next bike build is going to have a shorter wheel base even, because I've learned a lot of lessons on the importance of power vs handling over the past few races.
2 wheeled vehicles are NOT cars (which virtually always have higher handling limits when lower). A 2 wheel vehicle does not get to transfer normal force loading from one side to the other, it can ONLY TURN by cantilevering a weight off axis equal to the amount of turning g-force you're trying to achieve, if you can't balance those things, then you cant sustain the turn at that rate.
Guys on low bikes like that would need to climb up out of there seats and sit there ass on stools like 2ft tall off the seat just to even be physically capable of cantilevering the mass needed to turn like a normal bicycle.
This stuff isn't even on the table for debate, it's just basic physics, well proven on the streets, racetracks, and zillions of real life examples.
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