Hi
Everyone,
MotoGP bikes achieve accelerations up to 1.5g and lean angles of 52
degrees. They have no aerodynamic downforce, so the tyres must give a
coefficient of fricyion greater than one. I think the big problem with 2 wheel
mice is weight transfer.
Regards,
Duncan
-----Original Message-----My understanding is that F1 tyres are a balance between softness/stickiness/strength of the compound and the contact area with the road. If the rubber is too soft and sticky it doesn't have the physical strength to take the forces without tearing to bits. If the compound is too hard it lasts forever but offers insufficient grip. Of course, the whole equation goes out of the window as soon as any rain starts to fall. Wide slick tyres aquaplane and grooved tyres have to be harder to get the strength and then the grip is less. The major reason that F1 cars routinely manage better than 1g is that they have huge amounts of aerodynamically generated downforce increasing the contact pressure with the road without adding significant weight.
From: owner-micromouse@cs.rhul.ac.uk [mailto:owner-micromouse@cs.rhul.ac.uk]On Behalf Of Andrew Cattell
Sent: 21 July 2010 10:45
To: micromouse@cs.rhul.ac.uk
Subject: RE: Acceleration greater than 1g
If you go down the wide soft tyre route with your mice you will find that dust will be your enemy, as noted by others. The other thing you may not have considered is that the wider the tyre the more it will scrub during turning and the more the centre of the rotation may be thrown off by small changes in grip across the width of the tyre/unequal loading between the tyres/undulations in the road surface etc. Good luck.
Andrew.
Subject: Re: Acceleration greater than 1g
To: micromouse@cs.rhul.ac.uk
From: nbk@np.edu.sg
Date: Wed, 21 Jul 2010 08:01:34 +0800
Hi Harjit,
With 2 wheel drive, I was never able to achieve greater than 9m/s/s. I guess the weight transfer limits the acceleration.
With 4 wheel drive, 12m/s/s seems reachable. I have not done a thorough test yet but my 4 wheel mouse is able to run with that speed profile and achieve a faster time. So I guess it works.
You need to have really clean maze and tires. In fact, you need tires cleaner to give you the sticky characteristic.
So, you are right, the tires can really stick to the floor, but only for a short while. Sooner or later, it gets dirty.
Regards
BengKiatHarjit Singh <zeetahhs@hotmail.com>
Harjit Singh <zeetahhs@hotmail.com>
Sent by: owner-micromouse@cs.rhul.ac.uk21-Jul-2010 12:30 AM
micromouse@cs.rhul.ac.uk
To
Micromouse List <micromouse@cs.rhul.ac.uk>
cc
Subject
Acceleration greater than 1g
I've been puzzling how people are able to achieve acceleration greater than 1g and the only explanation I can come up with is that the tires are actually sticking to the ground.
Thoughts?
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