[DeTomaso] Trailering Tiedown Points

Fri Mar 16 12:06:48 EDT 2007

John
  I'm NOT an engineer either but some of my best friends are engineers and I also have to build the sheeeeit they design.....(probably not the best forum to write that either but here's what they said;

  The problem with the heavy webed over-the-tire tie down like U-haul uses is the over extension of tire PSI against the thermodynamics and then in the worst case scenerio you might contact and align trailering throttle thereby diminishing slacker reasons why one can not open road race.
  BWAHAHAHHA
  mAd dAwG

John McKee <johnmckee at cox.net> wrote:
  I'm NOT an engineer but I make fun of my friends that are...... (probably 
not the best forum to write that) ;o)
If you tie down the A-arms, are you not introducing a shear value to the 
suspension piece in a spot that was not designed to handle such a load?
I recently used the U-Haul double axle car-hauler and their only method for 
securing the car is a set of heavy webbed straps that lay over the front 
tires and ratchet down tight. The chains at the rear are probably more for 
legal issues than real security. I still tied down the rear cross member 
but I really like the idea of using those "over the tire" hold downs, maybe 
they should have those for all four corners?

John
4488

----- Original Message ----- 
From: "Tomas Gunnarsson" 
To: 
Sent: Thursday, March 15, 2007 3:03 PM
Subject: Re: [DeTomaso] Trailering Tiedown Points

> I'm an engineer and my understanding is that tiedowns on the wheels will 
> put no additional stress at all on the suspension.
>
> Tomas
>
> ----- Original Message ----- 
> From: "Matt Merritt" 
> To: 
> Cc: 
> Sent: den 15 mars 2007 16:30
> Subject: Re: [DeTomaso] Trailering Tiedown Points
>
>
>> Hi Mike and All:
>>
>> I'm no engineer but my basic understanding of leverage makes me think 
>> that
>> attaching tiedown straps to the wheels would put more stress on the
>> suspension (but probably not the unibody) than using the inboard part of 
>> the
>> A-arms.
>>
>> I guess that the bottom line is that if you're going to tow your Pantera
>> often you should fabricate some stout tow loops (not hooks).
>>
>> MM
>>
>> -----Original Message-----
>> From: MikeLDrew at aol.com [mailto:MikeLDrew at aol.com]
>> Sent: Wednesday, March 14, 2007 5:51 PM
>> To: peter-kovacs at sbcglobal.net; hjbutler at bellsouth.net; Matt Merritt;
>> detomaso at realbig.com
>> Subject: Re: [DeTomaso] Trailering Tiedown Points
>>
>>
>> In a message dated 3/14/07 15:18:33, peter-kovacs at sbcglobal.net writes:
>>
>> << No offense taken Matt. You both went in to more detail than I did and
>> brought up important points. I used to run the straps over the A arms 
>> until
>> I was advised by Pantera people at the Las Vegas event that I was 
>> possibly
>> impacting my alignment when cinching down the car. Is that a valid 
>> concern?
>> >>
>>
>> >>>I have seen A-arms bent by well-intentioned trailer-types, most
>> >>>notably in
>> the rear. The front ones seem stronger. Running the strap through the
>> wheel in the front seems to be a great technique, and in the back I would
>> definitely run the strap through some part of the chassis rather than the
>> A-arm.
>> Contrary to what Matt suggested, it's not difficult to run the rear 
>> straps
>> around the rearmost cross-piece of the chassis (to which the center sway 
>> bar
>> mounts are affixed).
>>
>> Finally, in the most extreme case, I have seen a Pantera chassis (Ellis
>> Woumnm's) literally broken by an overzealous tow truck driver. He 
>> cranked
>> down super-hard on the straps, then took the car on a very bumpy drive. 
>> The
>> chassis cracked just forward of the footboxes, and he had to weld it back
>> together at a PCNC tech session.
>>
>> Larry Stock recently discovered that his chassis was broken there too, 
>> and
>> the only thing holding the car together was his chassis stiffening 
>> kit!!!!
>>
>> Mike
>>
>> Mike

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