[AT] ROPS

[Gene Dotson]

    Just call it a limb guard. My D4 Cat had a canopy made from 3 inch pipe 
and quarter inch steel plate. Caught a 10 inch limb that was aimed directly 
at me and completely protected me from any injury. Thought it was a loud 
clap of thunder, but the sun was shining.

                            Gene



----- Original Message ----- 
From: "charliehill" <charliehill at embarqmail.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, April 05, 2010 8:03 PM
Subject: Re: [AT] ROPS


> If you are going to build your own roll bar and plan to have any hired 
> help
> you better NOT call it a ROPS.  Put a canopy on it and call it a strong 
> sun
> shade or something but DON'T call it a ROPS if you want to still own your
> land when the lawyers finish with you.  It might even be a good idea to 
> put
> a sign on it that says this IS NOT  A ROPS.  You can't legally build a 
> ROPS
> or even modify the one that came from the factory without submitting it to
> the testing labs for approval.
>
> I'm not saying don't build one.  Just be careful what you call it.
>
>
> Charlie
>
> ----- Original Message ----- 
> From: "Steve W." <falcon at telenet.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Monday, April 05, 2010 6:03 PM
> Subject: Re: [AT] ROPS
>
>
>> Dennis Johnson wrote:
>>> I agree with Dean that the only significant this is the height of the
>>> center of gravity, and the width of the rear heels. The front only
>>> comes into play only on a few extreeme circumstances such as dropping
>>> the rear wheel in a hole or something like that. I have personally
>>> done rollover testing of big trucks on tilt tables, and have also
>>> designed rollover bars (Headache racks) for many truck. I have seen
>>> some of these units tested when the trucks rolled over, and have seen
>>> some fail, but still took enough energy to prevent killing or severly
>>> huring the driver. The problem with most rollovers is it is rarely as
>>> simple at the tilt table testing. Many times there are 2 or 3 factors
>>> that add up to cause accidents.
>>>
>>>
>>
>> Very true. One of the things I like to do at race tracks is ask if the
>> roll cage was actually engineered OR was it just "well we needed a
>> couple hoops to pas the rule book" type stuff.
>>
>> It would be real easy to design a ROPS system if ALL it had to do is
>> support the weight of a tractor. Now if you want it to support that
>> tractor after it rolls over while traveling on a downhill slope and
>> moving at 8mph at the time. That gets interesting.
>>
>> One of the new requirement for fire equipment starting this year is a
>> built in roll protection system that is required to support the weight
>> of the vehicle without failure. BUT the standard is written in a way
>> that NO motion is included in it. The "test" the maker must pass is to
>> flip the vehicle with a crane and show that the cab doesn't crush. I
>> sent in a query about having the test be realistic and have the vehicle
>> rolling at 45mph and flipping and see what the cabs do. The answer I got
>> back was that my method was impractical!!!!!
>> I guess they must see a lot of trucks just flipping over while parked....
>>
>> -- 
>> Steve W.
>> (\___/)
>> (='.'=)
>> (")_(")
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