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Subject Topic: Bouncing
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28/11/2016 at 7:41pm
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Because a car weight wise is compatable it doesnt always mean its compatable , our bmw 318 is compatable with our adria .But it was awfull to tow with . So i use my van instead.im not saying that your car is incompatable but because it is on paper doesnt mean it is .if that makes any sense at all! Try towing it with somthing else if you can and if its the same get some shock absorbers fitted.


29/11/2016 at 10:50am
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i would have to ask.. what is meant by "bounce".. the car feeling bouncy (too much nose weight for the car)

or the van actually bouncing.. this would be too hard a suspension or just the tyres blown up too hard relative to the load they are carrying..

my van has commercial tyres.. it dosnt bounce.. but it might do if i did what a lot people do and blow them up to the max pressure it says on the side..

the stiffness of a tyre isnt about the side walls.. its all about how hard the things get blown up.. i run mine at 42 psi but they are rated at 65 psi on the side..

trog



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29/11/2016 at 4:06pm
 Location: West Yorkshire
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Quote:

the stiffness of a tyre isnt about the side walls.. its all about how hard the things get blown up.. i run mine at 42 psi but they are rated at 65 psi on the side..

trog




I would disagree with this. Where tyres are 'Reinforced' or 'Van' tyres, the tyre size will be exactly the same as non reinforced, but the tyre construction is different to allow for higher loads.

The pressure on the sidewall (not always there if imported)is the Maximum possible pressure not the recommended inflation pressure, which should be taken from the caravan handbook



29/11/2016 at 4:51pm
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my old senator did this sometimes, esp when on the concrete slab motorways, but i found it to be not enougth weight on the hitch.

-------------
Cheers
Ray

Discovery 4 & Bailey Barcelona 4







29/11/2016 at 8:45pm
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the maximum pressure is related to the maximum load.. in fact its all related..

i would sooner run commercial tyres at only 2/3s their maximum load at 2/3s their maximum pressure and 2/3s their maximum speed.. i least i know they will have an easy life..

i also dont overly trust what its says in handbooks..

but we can disagree.. i have no problems with that.. :)

i also run tyre slime in mine.. i am pretty sure most would disagree with that.. :)

i have a simple principle with caravan tyres.. anything that lessens the change of a tyre going down while on the move has to be good.. if they ever do it causes way too much damage..

trog



Post last edited on 29/11/2016 20:50:05


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29/11/2016 at 10:47pm
 Location: West Midlands
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With single axle caravans the pitching of the caravan bounces the rear of the car up and down. The more balanced the caravan is about the axle the more it behaves like a seasaw. With a single axle there is no device other than the cars rear suspension to damp the pitch. When i started out I loaded the van to achieve 55kg on the nose. It was awful. Like being on a boat. I gradually increased the nose weight to 85kg (my car can take 100kg) and it was much better.

-------------
First van bailey ranger 550/6
Now the proud owner of a coachman amara


30/11/2016 at 1:12pm
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nose weight works out as a percentage of van weight..

assuming the tow vehicle and other parts can stand it the more nose weight you have the better the stability..

the US say nose weight should be a minimum of 10% van weight..

that would be a 1000kG trailer should have at least 100kg nose weight..

we go for a little less i think its 8% of van weight..

the bottom line is the average car is not designed for towing.. and average nose weight they can manage is not an ideal nose weight..

trog

   


30/11/2016 at 6:10pm
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Hi.
It's 2015 dacia duster dci 110, 4X2. Caravan is
2006 avondale dart, mtplm 1250kg.   unladen 1030kg.
Thanks


30/11/2016 at 6:37pm
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It's just a bad match. You were poorly advised. 4x2 Duster allows only 50kg on towbar & your caravan needs over 70kg nose weight for stable tow. I know car is supposed to have 1500kg max tow weight but thats only a technical figure not real life.

Put the caravan on ebay & buy something that weighs no more than a tonne fully laden or buy another car like a Mondeo.


30/11/2016 at 7:54pm
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Caravans get heavier as people want a better spec, cars get lighter and geared for economy as people want low road tax high mpg.Imo bhp etc doesnt mater if the gearing and weight is all wrong .


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30/11/2016 at 8:50pm
 Location: West Midlands
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With a MPLM of 1250 and a car kerb weight of 1245 you are towing at over 100% although you are not breaking the law because your rated capacity is 1500Kg. However, this figure is actually the weight the car can pull up an incline. It's possible to tow a short box trailer short distances at low speeds but long and tall caravans are a different matter. Rules of thumb say 85% ratio of caravan to car kerb weight is a maximum. So for your 1250kg caravan your car should weigh 1470kg. This is probably the main reason towing your caravan is unpleasant. I tow at 87% and it's still quite dreadful. But I upgraded to a heavier caravan and didn't change my car. I used to tow at 71% and it was more pleasant but still not the best. When people state their car tows like the caravan isn't there they are generally talking crap. you are going to know you have 1200kg dragging behind you. I think flogging your van on eBay is a bit extreme but you may want to think about upgrading to a heavier car if you do like caravanning. You can also make sure you carry your awning and other heavy items in the car to ballast it down (within the limits of your cars max GW). I do this and it makes a difference.

-------------
First van bailey ranger 550/6
Now the proud owner of a coachman amara


30/11/2016 at 10:10pm
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Quote: Originally posted by Baileyjake on 29/11/2016
.... With a single axle there is no device other than the cars rear suspension to damp the pitch.



With the now not so popular blade type stabilisers, when they were connected they raised the rear of the car and the front of the caravan which reduced the pitching, but now with the almost universally fitted hitch type couplings this no longer happens

-------------
mm48j


01/12/2016 at 9:29am
 Location: York England
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Hi, Alan. I think I knew you at the Family Fund - of course you might be a different Alan Broadbent. Welcome to the clan of caravan owners. From your description it sounds as though the weight distribution in your van is incorrect. When loaded most of the carried weight should be placed over the axle area and just forward of it. It is also important to ensure that the weight of your unit does not exceed 3/4 of the towing weight of your car. If your van is an old one and you don't have the manual, you can probably download one from the internet so that you can check what the correct nose weight should be.

-------------
Sheila


01/12/2016 at 12:59pm
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Quote: Originally posted by chrisn7 on 28/11/2016
What has not been mentioned is that most caravans other than upmarket ones, are not fitted with dampers (shock absorbers). This leads to bounce on the road - if a caravan passes you hopping about a bit, you can be sire it has no dampers. Theses are available for Alko in different colours according to teh application, and are easy to fit as the mounting are already present - its just that caravan manufacturers are too penny pinching to fit to all vans.




If it was just problem with the caravan not having dampers, then surely more caravans would have these problems? I admit I haven't had my caravan for very long (coming up too two years) but I haven't yet seen a caravan bouncing down the road.

Its the same with caravans swaying, you can get the fancy Alko ATC (or whatever its called)but nothing beats having a caravan than is properly loaded.

Personally I feel these additions are all good and well, but they aren't strictly needed, and just add cost to caravans that are already expensive.


01/12/2016 at 3:13pm
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Quote: When people state their car tows like the caravan isn't there they are generally talking crap. you are going to know you have 1200kg dragging behind you.



Very much depends on what you're pulling it with, mate.

The downside of the luxury of this is 'forgetting' its there. More than once on a long, un-interupted drive (usally in France) i've suddenly glanced in my rear mirror and thought....that buggers a bit close!


01/12/2016 at 4:03pm
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Quote: Originally posted by Mick S. on 01/12/2016
Quote: When people state their car tows like the caravan isn't there they are generally talking crap. you are going to know you have 1200kg dragging behind you.



Very much depends on what you're pulling it with, mate.

The downside of the luxury of this is 'forgetting' its there. More than once on a long, un-interupted drive (usally in France) i've suddenly glanced in my rear mirror and thought....that buggers a bit close!





Certainly a rash statement you quoted there Mick.

I go along with what you say, especially the France bit.

-------------
XVI yes?

As well is two words!
How does a sage know everything about everything? or does he? or does he just think he does?
Remember, if you buy something you bought it, not brought it.



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