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Full Trip force

Discussion in 'Commercial Snow Removal' started by snowtime, Oct 26, 2005.

  1. snowtime

    snowtime Junior Member
    from Ohio
    Messages: 25

    So I was doing some research... (thinking about full trip vs. trip edge).

    The springs that most plows use have about 350lbs of preload. That's 4 springs, 1400 lbs total preload. The plows that I've looked at have like 20" from pivot to spring mount and 8" from pivot to pavement. So that's a 2.5x multiplier on the force required to open the springs.

    The spring angle decreased the force requred by some amount (cos of the spring angle) - so up to .5 or more I suppose (I'll have to go see what a typical spring angle is)
    That puts the trip force at the cutting edge to still well over 1000 lbs. :dizzy:

    So think of that next time you run in to a curb... :waving:

    And by all means, if my back of the envlope calcs are wrong please correct me - cause I never imagined it would be that high.

    If you're wondering - I called a company that sells plow springs for the numbers - they are straight from the spring manufacturer.
    Last edited: Oct 26, 2005
  2. Joe D

    Joe D Senior Member
    Messages: 605

    How much force does a 5000lb truck rolling at even 10mph into an immovable object apply?
  3. snowtime

    snowtime Junior Member
    from Ohio
    Messages: 25

    Well, yeah, that's the thing. Certainly more than enough the trip the blade.

    Its been a while, but lets see. The average collision force is m*dv/dt.
    If we work backwards to find dv/dt, lets say we want 1000lbs of force, so we need dv/dt=.2, so if the truck decelerates by .2 ft/sec in 1 second, it will trip the blade.

    .2ft/sec~ .14 mph

    This isn't the impact force, which would be much higher. But you are right, it doesn't take much with a 5000lb rolling truck...
  4. snowtime

    snowtime Junior Member
    from Ohio
    Messages: 25

    The next question is how many times can you put 1000+ lbs of impact loading on your frame?