It's a set of levers.
If the wheel that fell through is 10' from the center of the lift and
the boom is 100 feet that is a 10: ratio.
If the tire dropped 6" then that's a movement of 60 (5') inches at the
top of the mast. In a top heavy rig that is one whale of a lot of
momentum. If it dropped 12" then that is a 10' swing. OTOH The center is
raised several feet off the ground increasing the leverage so it'd be
even more.
73
Roger (K8RI)
Scottie Arnett wrote:
> Not trying to be a butt! But it is all Pythagorean theorem
> (http://en.wikipedia.org/wiki/Pythagorean_theorem) or a^2 + b^2 = C^2. Of
> course A, B, and C should be considered in the lift equations.
>
> Scott
>
> ---------- Original Message ----------------------------------
> From: "Marlon K. Schafer" <ooe@odessaoffice.com>
> Date: Tue, 13 Oct 2009 07:52:59 -0700
>
>
>> Yeah, I'd have to totally agree with this. Moving them, especially the big
>> ones, is just too dangerous.
>>
>> I don't have the math on me right now, but even a little 6" drop on a wheel
>> translate to a HUGE movement (probably in a bad direction) 80 or 100' out.
>> marlon
>>
>> ----- Original Message -----
>> From: "Marc Willis" <7g7mburo@gmail.com>
>> To: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
>> Cc: "Eugene Jensen" <eugenejensen@nyc.rr.com>; <TowerTalk@contesting.com>
>> Sent: Tuesday, October 13, 2009 7:43 AM
>> Subject: Re: [TowerTalk] man lift tips over
>>
>>
>>
>>> Roger - That is right 'Move into place and then extend it.' I just put my
>>> tower and antenna system up safely with an 80' man lift and it was
>>> awesome.
>>> This is the 3rd time I have used this method and it is wonderful. Rule of
>>> thumb 'move it and then extend'. Cheers and 73 Marc NC7M
>>>
>>> On Mon, Oct 12, 2009 at 11:15 PM, Roger (K8RI)
>>> <K8RI-on-TowerTalk@tm.net>wrote:
>>>
>>>
>>>> Eugene Jensen wrote:
>>>>
>>>>> OSHA will have a field day with this and my thought to the man family.
>>>>> I
>>>>>
>>>>>
>>>> One of the first things we were taught was to never move the base with
>>>> the boom extended up. That gives it a very high center of gravity.
>>>>
>>>> The story is a bit misleading as it is more of a case of the one wheel
>>>> "falling through" an access cover than "running over" which gives the
>>>> impression the other side was raised.. It may have dropped only a few
>>>> inches, but with an arm that long raised that is one whale of a lot of
>>>> leverage and momentum. And yes, I'm speaking from the experience of
>>>> rolling one over on it's side.
>>>>
>>>> 73
>>>>
>>>> Roger (K8RI)
>>>>
>>>>> just had my refresher class on these class machine's and interesting
>>>>> one
>>>>> point the instructor keep going over way walking the pass of the
>>>>> machine.
>>>>> Think about how these are used and they spend a lot of their time on
>>>>> work
>>>>> site with soft earth. So cave in is number 1 way for a collapse of
>>>>> these
>>>>> very heavy machines. 73 Gene K2QWD
>>>>>
>>>>>
>>>> Roll over...yes, they are easily rolled, but collapse. I've never seen
>>>> one collapse yet although I'm sure it's happened..
>>>>
>>>> 73
>>>>
>>>> Roger
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: towertalk-bounces@contesting.com
>>>>> [mailto:towertalk-bounces@contesting.com] On Behalf Of Gregg Seidl
>>>>> Sent: Monday, October 12, 2009 11:05 PM
>>>>> To: TowerTalk@contesting.com
>>>>> Subject: Re: [TowerTalk] man lift tips over
>>>>>
>>>>> How weird is that. It does say in the instruction manual to be aware of
>>>>>
>>>> what
>>>>
>>>>> you are driving over. Yes I read it before I went up with it. It says
>>>>>
>>>> that
>>>>
>>>>> shallow buried pipes,water tanks, septic systems can all give way due
>>>>> to
>>>>>
>>>> the
>>>>
>>>>> weight of the lift. Gotta pay attention when doing nearly anything
>>>>> today,death is just around the next oversight.
>>>>>
>>>>> Gregg K9KL
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> TowerTalk mailing list
>>>>> TowerTalk@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>>>
>>>>> _______________________________________________
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> TowerTalk mailing list
>>>>> TowerTalk@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>>>
>>>>>
>>>>>
>>>> _______________________________________________
>>>>
>>>>
>>>>
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>>>>
>>> _______________________________________________
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