Re: Flip over question

Posted by Dave (IL) on February 16, 2005 at 08:16:12 from (24.14.103.132):

In Reply to: Re: Flip over question posted by Hugh MacKay on February 16, 2005 at 01:28:29:

I was wondering the same thing last night Hugh. I guess I made the mistake of introducing it as an example in my third comment.

I was really trying to get to the mechanics/physics of a flip over. Key question is - if a correct drawbar hitch creates downforce on the front wheels then how come we can raise the front wheels pulling? And does that reach equilibrium or are we just approaching a local maxima, the other side of which will bring destruction :) (sorry. couldn't resist)

I'm now pretty much convinced that it's a function of the lockdown of the tire contact point and the torque supplied about the axle (somewhere between locked down and lots of flipping torque).

I did a reasonable web search last night and every flip over accident I found specifically mentioned an unsafe attachment of the chain, usually to the top link. I could not find one single reference to a flip over during a tractor pull, but I'm not certain it has never happened. Maybe I'll ask over on the puller forum, although I expect some of those folks are here too.

Interesting problem though. Wish I were 40 years younger and in a mechanical engineering program! I think I could pull Allan's D-8 over but it would take a heckuva winch and cable!

Thanks to everyone who contributed. As always there's wisdom in each reply.

I think this horse is dead!

Follow Ups:

• Re: Flip over question Hugh MacKay 09:52:51 02/16/05 (0)

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