Noseweight advice
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i think what Lutz is saying ( to put it in a simple way) is that if the nose was lifted so that it was directly above the axle then it would have no weight as its on the same centre line/pivot point. I think that if your nose was at your towing height and at the correct weight than 6" higher or 6" lower would not make a difference to the original weight. .
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As long as you leave the baby in mid air no force is being applied at the baby's end
Sorry how can you write that, really no force is being applied at the baby's end
So be clear you are saying there is no vertical force being applied or pushing down from the baby on the see saw seat? No Weight = mass x g? Have you ever drawn a force diagram?
As I said you cannot make the weight of an object disappear just because it is being supported elsewhere (which is what I said a few pages ago). There is always a weight on the nose (just like the baby). What the resultant of that force is of course is a whole different matter. That resultant can be zero but that force is always there. Just because the resultant is zero does not mean you can just ignore it, that is sloppy maths/physics and could lead to serious errors.
If you said the resultant noseweight is zero that is fine and perfectly accurate and in accordance with Newtonian physics. Just saying the noseweight is zero is not.
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but how would you calculate the force on the pivot if you don't take the vertical force acting on the baby, if as you say there no force is being applied at the baby's end.
See sloppy wording and which could lead to working leading to errors.
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The weight of the baby results in a couple in one direction around the pivot point of the see saw. The weight of the heavy chap results in a couple in the opposite direction. The difference between the two is the moment (or torque) necessary to bring the see saw back to a state of equilibrium. Knowing the length of the lever (in the case of a caravan the distance between the axle and the hitch) one can calculate the force necessary to provide such a moment about the axle. That force is the noseweight. Noseweight is always an applied external force. The forces within the see saw system are of no concern. In the case of a towed caravan the towball only perceives the external force, not what goes on with the caravan chassis.
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that's what lutz appear to be saying? no force being applied
Actually the baby has at least two forces acting on him/her (his weight and the seat pushing back)
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3.4 months
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Of course the baby is acting on the see saw but to get the see saw level again that weight is not sufficient. The added weight that is needed at the end of the see saw to do so is the noseweight.
For the car's towbar it is irrelevant how heavy or light the A-frame is or where the gas bottles are located, for example. It only experiences a resultant force due to the distribution of the various loads within the caravan and that is the noseweight.
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Who could overlook Sunday Departures. Didn’t it reach in excess of 10k posts?
Youve seen nothing yet, LL.
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Finally ten out of ten, you got there, noseweight is a resultant force. You have used the correct terminology. The weight on the nose itself does not equal zero but the resultant of all the forces acting on the nose can be.
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ahhhh Sunday departures. Happy days
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Of course it's the resultant force. It's so obvious that it shouldn't be necessary to even mention the word 'resultant'. Who cares what the A-frame (or the baby) weighs? The towbar certainly doesn't so its not part of the noseweight (or how do you define noseweight?).
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My 460 VIP 2014 when measured with all equipment comes out at 90kg on a milenco gauge that's with 2 calor lite bottles in front and all the equipment for siting the van in the front locker, all heavy stuff in the car including food. In the van clothes cooking utensils and bedding in the van plus aqua roles and waste master
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I don't think you'd be in my school MM
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I think you have shot you self in the foot again , the towbar doesn't weight anything? once again really? try dropping it in your other (unshot) foot. Everything weights something on this planet. Try standing on the tow bar and see if it affect noseweight? I think it would, but if you are correct who care what the towbar weights?
Also we haven't covered the effect of gravity (or g) varying with height? But I expect that is too obvious for you?
I'll close but I have noticed how engineers always use the obvious word (actually the height of hubris to think what is obvious to you is the same to everyone else) while mathematicians/physicists use precise language. I suppose we do all the background work for you
I wonder how many engineering accidents have been caused by the use of that word when designing something? You know - who cares what the A frame weights it won't have an effect.
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Who has said that the towbar or A-frame doesn't weight anything? Of course they do, but what relevance does the weight specifically of individual components have to the discussion? And as for gravity varying with height as long as we aren't talking about towing caravans on the moon or elsewhere in space, what relevance has that in practice, too?
Your arguments are very theoretical and seem to disconnect with their actual impact in practical real live situations.
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Just hope no-one gives up without revealing the correct answer 
