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Jun 12, 2020 19:56:26 GMT
Post by roger37 on Jun 12, 2020 19:56:26 GMT
Noseweight Limit, how to calculate nose weight on my twin axel trailer?
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Jun 12, 2020 20:23:32 GMT
Post by three5 on Jun 12, 2020 20:23:32 GMT
Noseweight Limit, how to calculate nose weight on my twin axel trailer? You generally don't want more than about 50kg as the noseweight on a trailer. The easyiest way to measure is is with a set of bathroom scales ( - but don't get caught doing it! ). If you are doing a theoretical calculation, and assuming that the twin axels have an interconnecting link, you would have to determine the the amount of weight in front of the centreline between the two axels and the amount of weight behind the centreline, e.g if the centreline of the axels is right in the middle of the load area and the load that you intend to carry is evenly distributed along the trailer the noseweight would be approximately the weight of the towbar and coupling - maybe 30 - 40 Kg. If you don't have some noseweight the trailer is likely to yaw from side to side at anything above a very moderate speed ( very dangerous! ) Have you a photo of the trailer that you could post Roger, ideally one taken from the side?
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Jun 12, 2020 20:43:54 GMT
Post by roger37 on Jun 12, 2020 20:43:54 GMT
Noseweight Limit, how to calculate nose weight on my twin axel trailer? You generally don't want more than about 50kg as the noseweight on a trailer. The easyiest way to measure is is with a set of bathroom scales ( - but don't get caught doing it! ). If you are doing a theoretical calculation, and assuming that the twin axels have an interconnecting link, you would have to determine the the amount of weight in front of the centreline between the two axels and the amount of weight behind the centreline, e.g if the centreline of the axels is right in the middle of the load area and the load that you intend to carry is evenly distributed along the trailer the noseweight would be approximately the weight of the towbar and coupling - maybe 30 - 40 Kg. If you don't have some noseweight the trailer is likely to yaw from side to side at anything above a very moderate speed ( very dangerous! ) Have you a photo of the trailer that you could post Roger, ideally one taken from the side? will do to-morrow.away at the moment doing a company pc upgrade.
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Jun 12, 2020 20:52:14 GMT
via mobile
Post by Mb2t on Jun 12, 2020 20:52:14 GMT
Noseweight Limit, how to calculate nose weight on my twin axel trailer? You generally don't want more than about 50kg as the noseweight on a trailer. The easyiest way to measure is is with a set of bathroom scales ( - but don't get caught doing it! ). If you are doing a theoretical calculation, and assuming that the twin axels have an interconnecting link, you would have to determine the the amount of weight in front of the centreline between the two axels and the amount of weight behind the centreline, e.g if the centreline of the axels is right in the middle of the load area and the load that you intend to carry is evenly distributed along the trailer the noseweight would be approximately the weight of the towbar and coupling - maybe 30 - 40 Kg. If you don't have some noseweight the trailer is likely to yaw from side to side at anything above a very moderate speed ( very dangerous! ) Have you a photo of the trailer that you could post Roger, ideally one taken from the side? Beg to differ... There is no theoretical easy way to calculate nose weight, as you need each and every part of the trailer and their location... very complicated! Much more accurate to measure and the above methode is a valid one (bathroom scale with a stick). You DO want more than 50kg on the nose, as the more you have the more stable the whole outfit is, but the car usually have a limit... I think the RAV is 80kg (for the 4.4). If i remember correctly you want about 7% of the trailer weight on the nose for a stable outfit, up to the car limit. M.
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Jun 12, 2020 21:13:04 GMT
Post by three5 on Jun 12, 2020 21:13:04 GMT
You generally don't want more than about 50kg as the noseweight on a trailer. The easyiest way to measure is is with a set of bathroom scales ( - but don't get caught doing it! ). If you are doing a theoretical calculation, and assuming that the twin axels have an interconnecting link, you would have to determine the the amount of weight in front of the centreline between the two axels and the amount of weight behind the centreline, e.g if the centreline of the axels is right in the middle of the load area and the load that you intend to carry is evenly distributed along the trailer the noseweight would be approximately the weight of the towbar and coupling - maybe 30 - 40 Kg. If you don't have some noseweight the trailer is likely to yaw from side to side at anything above a very moderate speed ( very dangerous! ) Have you a photo of the trailer that you could post Roger, ideally one taken from the side? Beg to differ... There is no theoretical easy way to calculate nose weight, as you need each and every part of the trailer and their location... very complicated! Much more accurate to measure and the above methode is a valid one (bathroom scale with a stick). You DO want more than 50kg on the nose, as the more you have the more stable the whole outfit is, but the car usually have a limit... I think the RAV is 80kg (for the 4.4). If i remember correctly you want about 7% of the trailer weight on the nose for a stable outfit, up to the car limit. M. I suspect that the 80kg figure is a maximum. I agree that you do want a downwards load on the towbar but "the more you have the more stable the whole outfit is........" is open to misinterpretation. The 80kg limit is important as it loads up the back suspension and in doing so reduces the weight on the front suspension. This can lead to snaking. As to "no theoretical easy way to calculate nose weight" I beg to differ there. I've had to do it when designing trailer mounted test rigs so as to determine the optimum axel placement. What would worry me is if the trailer has no compensating links between the axels.
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Jun 12, 2020 21:46:47 GMT
Post by roger37 on Jun 12, 2020 21:46:47 GMT
Beg to differ... There is no theoretical easy way to calculate nose weight, as you need each and every part of the trailer and their location... very complicated! Much more accurate to measure and the above methode is a valid one (bathroom scale with a stick). You DO want more than 50kg on the nose, as the more you have the more stable the whole outfit is, but the car usually have a limit... I think the RAV is 80kg (for the 4.4). If i remember correctly you want about 7% of the trailer weight on the nose for a stable outfit, up to the car limit. M. I suspect that the 80kg figure is a maximum. I agree that you do want a downwards load on the towbar but "the more you have the more stable the whole outfit is........" is open to misinterpretation. The 80kg limit is important as it loads up the back suspension and in doing so reduces the weight on the front suspension. This can lead to snaking. As to "no theoretical easy way to calculate nose weight" I beg to differ there. I've had to do it when designing trailer mounted test rigs so as to determine the optimum axel placement. What would worry me is if the trailer has no compensating links between the axels.
so what do it all mean....?
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Jun 12, 2020 22:05:07 GMT
via mobile
three5 likes this
Post by Mb2t on Jun 12, 2020 22:05:07 GMT
I think, in simple words, you want your trailer nose weight to be a bit below the max for your car, which should be stated in the manual. (That is my interpretation, and what I usually do)
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Jun 12, 2020 22:16:23 GMT
via mobile
Post by Mb2t on Jun 12, 2020 22:16:23 GMT
I did not say it is impossible, but practically, if you have a trailer and want to know the nose weight, the quickest way will be to weight it. When you designed trailers you had all technical information at your disposal, so easy to calculate.
On another note, you should oay attention to how the trailer is loaded, as for example too much weight behind the axle of the trailer, even with the correct nose weight can cause shaking. A double axle trailer, connected to the car at the correct hight should be more stable compared to a single axle.
Hope this helps and not too confusing.
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Jun 12, 2020 22:28:24 GMT
Post by roger37 on Jun 12, 2020 22:28:24 GMT
I think, in simple words, you want your trailer nose weight to be a bit below the max for your car, which should be stated in the manual. (That is my interpretation, and what I usually do) how do you know the nosw weight?
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Jun 12, 2020 22:35:33 GMT
via mobile
Post by Mb2t on Jun 12, 2020 22:35:33 GMT
I think, in simple words, you want your trailer nose weight to be a bit below the max for your car, which should be stated in the manual. (That is my interpretation, and what I usually do) how do you know the nosw weight? The manual should state it (sorry, on my mobile so cannot see what you drive at the moment). 4.4 is 80kg, do not know what it is for the 4.3 Edit : 4.3 according to Dr google is 75kg
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Jun 13, 2020 10:26:29 GMT
Post by three5 on Jun 13, 2020 10:26:29 GMT
I did not say it is impossible, but practically, if you have a trailer and want to know the nose weight, the quickest way will be to weight it. When you designed trailers you had all technical information at your disposal, so easy to calculate. On another note, you should oay attention to how the trailer is loaded, as for example too much weight behind the axle of the trailer, even with the correct nose weight can cause shaking. A double axle trailer, connected to the car at the correct hight should be more stable compared to a single axle. Hope this helps and not too confusing. Not balancing the load on the trailer will result in excess noseweight if the load is too far forward ( in front of the axles ) and reduce the noseweight, maybe even removing it, if it is too far behind the axle. I think that we are talking about the unloaded noseweight here as the payload will vary everytime you load the trailer. My method of avoiding this problem is to load the trailer when it is disconnected from the car and keep checking that I can still lift the jockey wheel from the floor. As long as I can do that it will tow reasonably.
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Jun 13, 2020 13:08:06 GMT
Post by roger37 on Jun 13, 2020 13:08:06 GMT
I did not say it is impossible, but practically, if you have a trailer and want to know the nose weight, the quickest way will be to weight it. When you designed trailers you had all technical information at your disposal, so easy to calculate. On another note, you should oay attention to how the trailer is loaded, as for example too much weight behind the axle of the trailer, even with the correct nose weight can cause shaking. A double axle trailer, connected to the car at the correct hight should be more stable compared to a single axle. Hope this helps and not too confusing. Not balancing the load on the trailer will result in excess noseweight if the load is too far forward ( in front of the axles ) and reduce the noseweight, maybe even removing it, if it is too far behind the axle. I think that we are talking about the unloaded noseweight here as the payload will vary everytime you load the trailer. My method of avoiding this problem is to load the trailer when it is disconnected from the car and keep checking that I can still lift the jockey wheel from the floor. As long as I can do that it will tow reasonably. thanks all for the help
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Jun 13, 2020 15:20:37 GMT
via mobile
Post by Mb2t on Jun 13, 2020 15:20:37 GMT
Education:
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