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Pitbull TRS twisting swingarms ?

Discussion in 'General' started by DBConz, Jan 4, 2021.

  1. R Acree

    R Acree Banned

    And what non-engineers and non-statisticians refer to as BS.:D
  2. stangmx13

    stangmx13 Well-Known Member

    A good engineer would call it expected. Such a low incident occurrence is really really good.

    If it isnt obvious, I find it fun to think about hypothetical extreme cases and HOW they might happened.
  3. lopitt85

    lopitt85 Well-Known Member

    If I didn't do a good job expressing my thoughts, this is what I meant earlier in my post. That's the only way I see forces being large enough to tweak the swingarm.

    I don't think it would be a common occurrence, but would be possible if the side to side motion of the trailer is violent enough.

    The front end of the bike trying to rotate violently left to right, around the mounting point, repeatedly, would put some pretty extreme forces way at the end of the lever (i.e. bike rear axle/swing arm/mounting point) with some significant mass behind the motion.
  4. rd49

    rd49 Well-Known Member

    Seems like any easy way to test is put the bike in the TRS and Lift the bike from the front and see if there is any side to side movement. Bike is being held at 2 points on either side of the axle, not a single point. Not an engineer and did not stay in a Holiday Inn.
  5. baconologist

    baconologist Well-Known Member

    Nothing against RCA, i’m just in the camp of chalk it up to “shit happens” and move on. Theres a lot more meaningful things to do with the time wasted doing RCA on this.
    sdg likes this.
  6. cav115

    cav115 Well-Known Member

    Is this because your swingarm is canted 10 degrees to the right to give you a CW advantage??? :D
    ekraft84 and baconologist like this.
  7. Phl218

    Phl218 .

    in an FMEA, the occurrence and severity rating combined would probably lead to an alternative design if the TRS were automotive parts.
  8. stangmx13

    stangmx13 Well-Known Member

    Whats the meaning of severity rating? I dont remember that term.
  9. OGs750

    OGs750 Well-Known Member

    How bad is it when the bad thing happens. Like chipping paint would be a 1 and killing someone would be a 10.
  10. Phl218

    Phl218 .

    severity: and detection:

    the total number is the multiplier of occurrence, severity and detection. all go from 1-10. you don't want a 10 anywhere, since it means you wouldn't detect it, it is surely to occur or deadly when it happens (severe) .
    BigBird and stangmx13 like this.
  11. baconologist

    baconologist Well-Known Member

    So, 8-1-6?
    Phl218 likes this.
  12. ekraft84

    ekraft84 Registered User

    I actually really like CCW.. lol
    cav115 likes this.
  13. pickled egg

    pickled egg Tell me more

    The TRS didn’t “cause” the bends. If anything “caused” them, in the given hypothetical, it would be the extreme forces applied to the mass being held in place by the TRS.
    Rising Sun, Phl218, OGs750 and 2 others like this.
  14. 05Yamabomber

    05Yamabomber Dammit Haga

    I can see this happening in an extreme case. Especially if bouncing and swaying at same time. Would not deter me from using the TRS though. Its on the list of things to get for the trailer. The last trip my R6 took in my trailer, it bounced enough to dislodge the internal pump in my fuel pump (popped out). There is a horrible stretch of freeway from Riverside to San Diego. Those bike bounce around even without blown out tires or sway.
  15. Spitz

    Spitz Well-Known Member

    Stress designed in a specific manner though. You can probably dent most swingarms with a good blow with your fist. I mean, they totally these things out by the 100's for small crashes because they are made to be light, its just the name of the game. I'm not saying its an everyday occurrence, i've used those restraints and they were THE thing to have for sure, but I always questioned what would happen if the front of the bike really wanted to go in whatever direction it wanted to. It didnt stop me from using them for sure, but I was well aware of what could possibly happen.
  16. sdg

    sdg *

    They total these things out for cosmetics...
  17. Phl218

    Phl218 .

    Let’s put it this way:

    you drive your car buckled up and knowing there’s an airbag in place if shit went south.

    You pop a tire, swerve into a wall, airbag and belt saved you. Car is wrecked though. Damn potholes.

    same for the trs. It holds the bike in place properly and safely.

    people haul bikes all over the place with them.

    shit goes south. Trailer tire pops and the thing does a roller coaster sans the loop. Bike is still there but there might be a bruise here or there. +/-3 degree / % depending on the bike

    a SHTF-Proof restraint system would run you 3x the cost of a TRS and surely more than a TPMS for your non-pressure checked china bomb trailer tires you’re hauling the thousands of $ of race stuff around with

    (You as in not you personally but the general trailer public)
  18. Knotcher

    Knotcher Well-Known Member

    One strategically placed tie down ring in front of each bike and a loop of nylon fixes this potential issue.
    Rising Sun and lopitt85 like this.
  19. Ducti89

    Ducti89 Ticketing Melka’s dirtbike.....

    We dont want solutions. We want debate and to argue unknowns...
    Gino230, Rising Sun and Phl218 like this.
  20. motoracer1100

    motoracer1100 Well-Known Member

    Baxley front wheel chock with 4 straps is how I always roll . Never had a problem, never will , end of story .

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