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steering geometry

Printed From: BHPC Forum
Category: Public: Open to anyone
Forum Name: Building
Forum Description: Anything to do with building HPVs
Printed Date: 11 August 2020 at 7:58pm
Software Version: Web Wiz Forums 11.02 -

Topic: steering geometry
Posted By: Brucey
Subject: steering geometry
Date Posted: 11 September 2019 at 4:37pm
went a bit OT in the 2019 battle mountain thread.  Found the illustration below,  but does anyone have comparable data for bicycle tyres?

Posted By: GeoffBird
Date Posted: 11 September 2019 at 4:52pm
I think that is called 'tyre cornering stiffness'. Bicycle tyres aren't designed to take lateral loads so tyre manufacturers are unlikely to have data. I don't know of any tests by HPV enthusiasts.

Right Time - Right Place - Wrong Speed

Posted By: Brucey
Date Posted: 13 September 2019 at 10:26pm
it occurs to me that even if you did take the above  into account and therefore obtain the highest lateral force, when riding an HPV this still might not be fastest way round the circuit. 

The reason for this is that you don't have unlimited amounts of power available, so if you increase lateral grip by 1% but it comes at a cost of a similar percentage increase in drag (which it might if you are exploiting a high slip angle), it might end up being a net loss, vs using that energy at some other point around the circuit.

Of course if the choice is braking into a turn a bit less, a higher cornering speed is more of a no-brainer, but if you end up pedalling through turns any drag increase isn't such a good idea.


Posted By: GeoffBird
Date Posted: 15 September 2019 at 4:37pm
Yes, this is why Chris told me that maintaining Ackermann geometry is important. Rolling resistance is very bad when  you have 0.25 bhp!

Right Time - Right Place - Wrong Speed

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