bobk
Member Since: 22 Nov 2007
Location: Fernvale Qld
Posts: 12
  
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Just wondering if anyone has done the exercise of weighing the front axle of a D3 in normal situation and then weighing with caravan hooked up. I would be very interested in the difference and hopefully stop some of the Disco knockers.
I plan to do the exercise with my own van, at the first opportunity I get, but just thought someone else may have already been through the exercise.
Cheers,
bobk bobk
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 14th Mar 2010 2:40 am |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
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Axle ? 
 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 14th Mar 2010 7:02 am |
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DaveS
Member Since: 15 Aug 2009
Location: Weybridge
Posts: 241
 
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There is no need to weigh it as it can easily be calculated. The maximum permitted nose weight of a trailer is 150kg. The tow hitch is about 1200mm behind the rear axle (depending which tow bar is fitted) and the wheelbase is 2885mm. Treating it as a simple lever, the load of 150kg on the hitch will lighten the load on the front axle by 62kg and increase that of the rear by 212kg.
Since the kerb weights are 1450kg on the front axle and 1850kg on the rear the maximum towing weight will reduce the front weight by about 4% and increase the rear by about 11%.
Why do you ask?
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| 14th Mar 2010 10:31 am |
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ad15
Member Since: 14 Dec 2008
Location: up that tree
Posts: 4866
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apt that you are in weybridge....  one wife.......livid
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| 14th Mar 2010 10:59 am |
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Frapp
Member Since: 19 Dec 2008
Location: Norff Zummerzet
Posts: 1655
 
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He's a wizard with a calculator  Member of the carrot crank club
Embarrassingly in for the 2nd round, bought another two
D3 Jack Russell carrier
D4 Landmark for towing duties
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| 14th Mar 2010 11:05 am |
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Discoeast
Member Since: 19 Feb 2008
Location: Boksburg
Posts: 800
 
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Dave,
Could you pass on that calc, could use it if it could help me
in some HGV multi trailer applications, to pin down the 5th wheel/
king pin positions with some simple basic math, in relation to axle
group centers ( wheel base ). As some times the engineers place
a CG that will not work with the application, and the weigh bridge
guys have a field day with us on weight distribution issues D3 bullbar-spots-roof rack with spots-ladder-long range tank-swing out spare wheel carrier- upgraded tow bar-dash console-internal water tank-duel awnings-drawer system & T T.
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| 15th Mar 2010 5:55 pm |
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DaveS
Member Since: 15 Aug 2009
Location: Weybridge
Posts: 241
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Since the kerb weights are 1450kg on the front axle and 1850kg on the rear the maximum towing weight will reduce the front weight by about 4% and increase the rear by about 11%.
I treated the car as a lever with the fulcrum being the rear axle and the front axle and the towing hitch being at the two ends. The lengths of the two parts are 2885mm for the front section (wheelbase) and 1200mm for the rear (hitch ovehang from rear axle).
To support 150kg at the hitch we need to apply a downward force of 150 x 1200/2885 = 62kg at the front axle. This will have the effect of reducing the loading on the front axle by 62kg. The additional load applied to the rear axle will be 62 + 150 = 212kg. In effect, this is the load transferred from the front axle plus the load asupported by the hitch.
You could calculate the loadings by treating the front axle as the fulcrum and this would give the same results. There is an article about levers in Wikipedia if you need the theory.
Last edited by DaveS on 15th Mar 2010 6:59 pm. Edited 1 time in total
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| 15th Mar 2010 6:24 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
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What axle  21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 15th Mar 2010 6:32 pm |
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Pelyma
Member Since: 06 Jan 2005
Location: Patching, Sussex
Posts: 15496
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I think you will find the maximum nose weight is a lot more in the rest of the world. Our Aussie members talk about towing with 300Kg noseweights.
Did you say something Rich? DS3 TDV6 HSE - Silver with Alpaca (old one) Gone
DS3 TDV6 HSE- Silver with Alpaca (new one) Gone
D4 HSE Lux - Montalcino Red Gone
Porsche Cayenne V8 Diesel S
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| 15th Mar 2010 7:09 pm |
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DaveS
Member Since: 15 Aug 2009
Location: Weybridge
Posts: 241
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My calculations were based on the maximum nose weight of 150kg from the Owner's Manual.
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| 15th Mar 2010 8:27 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978
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Pelyma wrote:
Did you say something Rich?
Just wondering where they are ?...I can't find them on mine 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 15th Mar 2010 8:41 pm |
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caverD3
Member Since: 02 Jul 2006
Location: Oberon, NSW
Posts: 6922
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Axle load is the load on the ground across the vehicle.
I think he wants to be able to demonstrate the effect of the down load on the towbar has on the weight at the front wheels.
It would be interesting to know a comparison with other vehicles eg Tojos.
I think the only way to do it would be to put the front wheels on a waybridge and measure then hook up or unhook the trailer.  “There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
Ernest Hemmingway
D4 3.0 Active Diff, Adaptive Lights, High Beam Assist, Surround Cameras, Privacy Glass.
D3 2.7:Adaptive Headlights,Electronic Rear Diff,ARB Bar,Blaupunkt Speakers,JVC Powered Subwoofer,Removable Snorkel,Mitch Hitch,Pioneer After Market Head Unit,Steering Wheel Control Adaptor,Remote Adjustable Supension Rod System, Taxside Dual Battery System.
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| 15th Mar 2010 10:06 pm |
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TDV6
Member Since: 23 Apr 2006
Location: Queensland or there abouts
Posts: 96
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Weighbridge already done by "CVan and Mhome" magazine last year with a D3, the results were using a standard AU spec hitch, having 180kg nose-weight resulted in 60kg less on the front wheels.
OZ specifications for maximum tow-ball down force is 350kg.
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| 19th Mar 2010 11:34 pm |
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