<VV> Fuel Leak

Hugo Miller Hugo at aruncoaches.co.uk
Fri Sep 28 06:47:20 EDT 2018

I think there is more to it than that. I’m sure there is some obscure scientific theory at work. Of course the forces on the front wheels act in one direction, but on the rears it’s in both directions. I have an old Lagonda with terrific brakes! 
But the spinners do seat on a huge taper which ‘locks’ them onto the wheel, so they never come off. 

From: Joel McGregor 
Sent: Friday, September 28, 2018 11:16 AM
To: Hugo Miller 
Subject: Re: <VV> Fuel Leak

Same reason.  If they aren't tightened it is less likely for them to fly off immediately.  The forces are different and much greater since the rotation of the wheel is concentric with the threads.  I guess they think acceleration forces are greater than braking.  I would think the opposite.  You should leave a knock-off loose and let us know.
Maybe it is because on large vehicles braking is always potentially a greater force than acceleration and sports cars with knock-offs were the opposite back then.  Most old sports cars I am familiar with had pretty poor brakes compared to their acceleration.

Joel McGregor

-------- Original message --------
From: Hugo Miller via VirtualVairs <virtualvairs at corvair.org> 
Date: 9/28/18 4:04 AM (GMT-06:00) 
To: roboman91324 at aol.com, virtualvairs at corvair.org 
Subject: Re: <VV> Fuel Leak 

Funny you should say that, as I was about to agree with you that it might indeed be the Coriolis effect at work. In truth I’m not sure what forces are at work that make wheel nuts do what they do, or more specifically why you are better off with a left-hand thread on wheels that rotate anti-clockwise. I’m even more surprised that somebody figured this out so early on in the days of motoring, since the whole concept of lug nuts didn’t exist before the motor car. 
Now tell me why RIGHT-HAND knock-off wheels have a LEFT-HAND thread on the spinners  

From: roboman91324 at aol.com 
Sent: Friday, September 28, 2018 4:20 AM
To: Hugo at aruncoaches.co.uk ; virtualvairs at corvair.org 
Subject: Re: <VV> Fuel Leak


Please excuse my last post.  Mechanical precession is exactly what is going on with left-side lug nut loosening.  I assumed you were talking about precession as it pertains to the dynamics of rotating mass.  I. E. gyroscopic precession.  I have always known it as epicyclic fretting.

By the way, mechanical precession is still a concern but the deeper tapered lug nuts added just enough friction to compensate.  In addition, the taper (acorn) itself, not just the added contact area, has been the solution to the issue in two ways.  First, the taper acts as a wedge which increases the applied force "N" in the frictional force equation.  Second, the taper allows for different diameters at different points of contact.  These interesting tricks of Physics were a game changer.

Again, my apologies,


PS:  I believe the rest of my posts to be accurate but you never know.
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