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Thread: auction trailer
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16th Jun 2010, 02:02 AM #1
auction trailer
Hi all, I have a few trailer questions, but , story first.....I got this trailer in a bit of auction madness bidding war when I had a closer look at it I probably paid a bit much for it oh well I didn't have a trailer before and now I do it has a few redeeming features... winch on the front, led lights (needs reverse tho) it tilts, hydraulic brakes and is big for a single axle, was a plant trailer for moving????? Tows ok empty, but, loaded not as good as I'd like has a bit of a sway, only slight, I'm a bit gun shy after having a car tandem throw me off the road many moons ago.
I did a bit of a google on trailer design and seemed to be that ahead of the axle 60% of the trailer bed with 40% behind so if bed is evenly loaded this then gives the tow hitch a bit of wieght, not sure if that gives the 10 to 15% hitch wieght or not I'm thinking that the drawbar length may have an impact on the actual % value.
I had a closer look at mine and it looks like I have a bit too much bed length hanging over the axle especially when evenly loaded, I did place the long lenghts towards the front so as to give some hitch weight but didnt do much to counter the overhang/sway, I tried bumping the tyre pressures up a bit but didn't change.
Questions...
What are the factors that contribute to sway and Is there a single big one?
Is there an ideal drawbar length?
Is there a typical leaf spring rate table somewhere? I want to be able to gauge loaded wieght based on spring deflection.
What is the max load I can have on a single axle, and What determines that max? tyre specs? rim specs? axle max load? spring rate? ADR
The tyres on it are light truck, they have a max tyre pressure of 65psi Has anyone had their tyres up this high towing and if u did, Did u put em up because of a full load?
I registered it as unbraked, 749kg, I didn't know it had brakes at the time, that then means I can take a heavier load, Is that right, and I probably have to change the rego?
Thanks to all in advance
Pete
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16th Jun 2010, 03:42 PM #2
As our learned friend yonnee would say;
"the axle should be located rear of the middle 1/2" for every foot of trailer body length".
I think though the sway is coming from that very short drawbar that is on it. Can you measure its length from the front of the trailer.
cheers
Fixed from 1" to 1/2". Thanks yonnee
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16th Jun 2010, 06:18 PM #3
Looks like you've got to much rear overhang to me, reckon the axle needs to back a further 10" or so
Cheers
DJ
ADMIN
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16th Jun 2010, 07:07 PM #4
Dazzler's right, 1/2" rearward of centre for every foot of trailer body is where the axle should be. And it has nothing to do with the drawbar length at all. There are figures of 10-15% ball weight that are quoted around the trailer and caravan industry, but I strongly disagree. At one end of the scale, an empty 300Kg 6x4, 30Kg is too light. And at the other end, most towbars aren't built to cope with more than 250Kg tops, so 10% of a 2500Kg caravan is a little high.
Originally Posted by pjtLast edited by Yonnee; 17th Jun 2010 at 12:35 AM. Reason: Dazzlers correction and more info.
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17th Jun 2010, 12:00 AM #5danielson
- Join Date
- Dec 2009
- Location
- broadford
- Age
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i think its about right for a tilt trailer?
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15th Jul 2010, 11:13 AM #6
Thanks for contrubutions...
Measured spring leaves yesterday (finally)
leaf length eye to eye 715mm
width 45mm
thickness 8mm
4 leaves
axle dia 45mm round...are these usually solid?
They do seem very stiff to me, had approximately 1200kg on it yesterday and still heaps of travel.
With the 1/2" dimn, for say a 5' tralier body axle should be 2 1/2" rearwards of centre?
Pete
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15th Jul 2010, 08:27 PM #7danielson
- Join Date
- Dec 2009
- Location
- broadford
- Age
- 63
- Posts
- 213
if you move axle to rear of centre of trailer body it wont work easily as a tilting trailer and will be very sudden in its leveling action when the laod is pulled forward onto the front section of deck.danny
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16th Jul 2010, 12:10 AM #8
I didn't realize it was a tipping trailer when I was bidding on it, the dynamics of how it behaves as a tipping trailer will change if I move the axel, but, the trailer needs to be rebuilt so I am tossing up rebuild and sell it as a tipping trailer or build something more to my needs which doesn't really need to be a tipping trailer although it could be handy ohh what to do what to do
It does really need to be stable so that might override any tipping disadvantages
Pete
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16th Jul 2010, 10:24 PM #9
Your measurement for standard axle placement is correct. However, this the usual rule of thumb, but not the be all and end all, so there are some applications where this measurement will differ.
As for your springs, all the information I have at my disposal, and I've collect a fair bit over the years, show that spring set to only be around 700Kg for a 4 leaf spring.
Originally Posted by danielhobbyToo many projects, so little time, even less money!Are you a registered member? Why not? click here to register. It's free and only takes 37 seconds! Doing work around the home? Wander over to our sister site, Renovate Forum, for all your renovation queries.
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16th Jul 2010, 11:08 PM #10
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