Bike on the back of a 584

[airwave]

Can someone check my calculation's here , guy's . I'm planning on planting a small gofor on the back of my van , next year . Trouble is my calculation's figure it's only gonna cost , 28kg of my payload . I expected more , though it has loaded my back axle a bit .

Figure's are ;

• front axle 1500kg , max 1750kg .
• back axle 1560kg , max 2000kg .
• all up weight 3700kg max .
• wheelbase 3150mm , measured .
• overhang 1900mm , also measured .
• bike weight 78kg , rack Hymer slide under , already fitted and part of the weight's above .

Though i like the answer , post's on this subject indicate a more significant loss of payload , just want someone to double check it for me , before i start spending some serious dosh .

 

[peterc10]

The increase in ovrrall payload will be the weight of the bike. The trouble is that this will add more than that to the rear axle and take some of the front. My guess is it will add about 130kg to the rear and take off about 50kg from the front.

 

[Wagoneer]

Agree with @peterc10.

If your overhang dimension doesn't include the position of the bike on the rack, then you'll probably need to add an extra 500mm at least.

The extra 500mm would give a load of 140kg on back axle and 60kg lighter on the front.

 

[airwave]

My guess is it will add about 130kg to the rear and take off about 50kg from the front.

Whoa , really good guess , Peter . The actual difference , according to my calculation's , is the rear has increased by 125.05kg , and the front end looses 47.05kg .
Bringing my axle weight's up to ;

• Rear , 1685.05 .
• Front , 1452.95 .

Ironically , the up grade in axle loading , could not be fully used due to all up weight . The axle's total 50kg more than gross weight , however the weight of the bike on the back has reduced that to 28.8kg , either way i'm left with better than , a half tonne payload , spread . Don't forget it's just me , solo , and if i was doubled up i , doubt i would have the bike , on board anyway .

If your overhang dimension doesn't include the position of the bike on the rack,

Ah , now that is a very good point , my friend , i didn't measure with the rack open , this was why i posted , for someone to check my calculation's . To be honest , i found out last night , the bike is actually 6kg lighter too , at 72kgs . So the finish calculation's are all shot anyway , but it does at least show , it's viable .

 

[Badknee]

There is a usable chart in resources that you can add and subtract from etc. It's what I'm going to use after I have weighed our Moho in travel trim. When empty it weighed 3600kgs with a maximum of 5250 and 3500 on the rear axles.

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[hilldweller]

Moment of bike ( what about rack ? ) from front wheels
( 3150 + 1900 ) * 78 = 398950
Load onto back axle 398950 / 3150 = 127kg.

 

[airwave]

There is a usable chart in resources

Thank's Paul , i've already found it and downloaded it mate .

what about rack

Yep , that one down to me Brian , @Wagoneer has already pointed that failing out . I'm on a campsite with the van right now , first time out with it . Lol , and if it stop's raining , i'll go out and measure it . I can't get your calculation's to work though mate , took me a little while to figure it out , but the best i came out with , 3150 + 1900 = 5050 , *78 = 393900 , / 3150 = 125.04762 , am i missing something . I'm used a different formula , think it was the caravan club , but if two different formula's are coming out nearly the same ! .

 

[hilldweller]

but if two different formula's are coming out nearly the same ! .

Looks like finger trouble here, just run it again to get 125.

It's not a formula as such, just simple lever calculations as taught to a 12 year old long long ago. Accredited to Archimedes who's famous quote was "if I had a lever long enough I could move the moon".

For the front axle you just use the rear axle as the pivot to get.

1900 * 78 = 3150 * F so the front = 47. Lighter of course which is the last thing we need on a FWD MH.

I've just connected your aircraft connection, one of few times I've used these calculations in recent memory is weight and balance of a plane.

 

[airwave]

It's not a formula as such, just simple lever calculations

Don't matter mate , it's a different system of calculation , and it come up with a very similar answer's . Really big thank's for that Brian , i do appreciate people checking these figure's for me with as many different method's as they can find to save me making a costly mistake , that's why i punched them up . It does look's to be a goer , though it will be a bit heavier on the back end because i didn't measure properly . That was a stupid mistake .

Your point is taken with the front end too mate , and i totally agree , but i've got an idea to counter that one as well .

Oh , and i remember the saying too , just not the calculation .

 

[hilldweller]

Oh , and i remember the saying too , just not the calculation .

I just did a bit of reading on Archimedes. We conceited smart phone age folk think we are clever but the things he worked out 2300 years ago, a minor one being leverage, is just amazing. We may know more but we are not cleverer.

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[airwave]

We conceited smart phone age folk think we are clever

Lol , being happening though the age's Brian , a few year's back i remember when ford brought out their new mondeo , it had one touch electric window closing . It was marketed as the best thing since sliced bread , then i came across a 50's/60's , american car that had already had it . Another one was the convertible hardtop , think it was a merk , ford already had used it , in the 50's thunderbird , there's a few more i could name , but i ent going to . Ancient Greek's were using computer's long before anyone else , and of course there were the people who just used the brain's . I once read a book about Nostradamus in the 90's , i actually ready about 9/11 , though i didn't realise it at the time , no one did , i have heard it said , he even predicted trump , this is what 1500's . We are all far from being clever , just deceitful , mate .

 

[hilldweller]

he even predicted trump .

Oh come on. We can't even predict him in 2017.

 

[airwave]

We can't even predict him in 2017

Lol , i don't think anyone can , mate . The problem with Nostradamus is his prediction's were written in a kind of code , because he was frightened of being arrested . it's far easier to fit the event to his writing's after it's happened .