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Old 14 September 2012, 09:49   #81
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Old 14 September 2012, 10:07   #82
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Quote:
Originally Posted by Downhilldai

See post 1: 80x40x3 RHS
Feck me DHD.... Did you actually read all that?.. :-)

I was waiting for the 'Jeepster's trailer for dummies' to be published. :-)

Simon

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Old 14 September 2012, 11:04   #83
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Originally Posted by Anchorhandler View Post
Jesus....if ever we needed (more) proof that you have no idea what your talking about then ....HOW AM I SUPPOSED TO CALCULATE THE MAXIMUM POSSIBLE LOADING ON YOUR SIDE RAILS WITHOUT THE DIMENTIONS (AND THICKNESS) OF THE SIDE RAILS THEMSELVES.
Duh!...If you took the time to read through my original post on this thread you would have noticed that I already gave you all the dimensions and thicknesses of the materials used to build the trailer
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Old 14 September 2012, 12:12   #84
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Quote:
Originally Posted by Anchorhandler

Feck me DHD.... Did you actually read all that?.. :-)
I was intrigued...
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Old 14 September 2012, 14:01   #85
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Er, it only a 9.9hp!
Holy shit .. is it ? ..... I thought they managed to get loads of power into really small spaces these days ? .. maybe someones fitted the wrong cowling on your engine ?
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Old 14 September 2012, 14:10   #86
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Originally Posted by jeepster View Post
Duh!...If you took the time to read through my original post on this thread you would have noticed that I already gave you all the dimensions and thicknesses of the materials used to build the trailer

Yeah....

I wasnt going to reply anymore as its pretty clear there is nothing on this forum that you either dont already know or dont want to hear but since the safety of other road users comes into it i figured i better post these pictures....

They both show the computer simulation of the loading on each side of the trailer based on forces being applied at the points you have indicated. Picture 2 follows from the bottom of picture 1.
As you can see, the first shows a simple forces diagram showing the current set-up of your trailer....
I have allowed for a 6" landing area where the axle meets the side rails.
I have also set this up on the assumption that you have used a 50B grade steel or similar.
I have simulated a 200kg force forward and a 210kg force aft (at the points that the swingbeams connect to the rails.

This gives you a total loading of (200x2)+(210x2)= 820kgs

If you loook at the second picture you can see that in your case you are on the absolute limit of the permissible stress allowed in the steel. (Highlighted red, 208Mpa out of 207Mpa m, ax). Beyond this you risk deforming the steel leading to possible failure. Incidentally It also shows a maximum deflection of 18mm

Keep in mind that i havnt subjected the loadings to any safety factor either.

Your best option to render this safer is to move the rear swingbeam further forward thus reducing the bending moment on the side rails.


But of course... you already knew all this didnt you?

Simon
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Old 14 September 2012, 14:31   #87
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Edit: I haven't included the strength of the angle bar used where the axle ties into the rails as i didnt know the length and thickness of said bar. This will have a positive effect on the loading reducing the stress in the rail.

If i get time i will re-do the simulation but considering i havent included a safety factor into the calculations (by increasing the loadings proportionally), i would estimate it will be very similar to the results shown above.


Simon
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Old 14 September 2012, 14:32   #88
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Old 14 September 2012, 14:49   #89
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Quote:
Originally Posted by Anchorhandler View Post
Edit: I haven't included the strength of the angle bar used where the axle ties into the rails as i didnt know the length and thickness of said bar. This will have a positive effect on the loading reducing the stress in the rail.

If i get time i will re-do the simulation but considering i havent included a safety factor into the calculations (by increasing the loadings proportionally), i would estimate it will be very similar to the results shown above.


Simon
Ahh! but don't forget to allow for the holes
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Old 14 September 2012, 14:53   #90
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Originally Posted by Bigmuz7 View Post
Holy shit .. is it ? ..... I thought they managed to get loads of power into really small spaces these days ? .. maybe someones fitted the wrong cowling on your engine ?
Well is it a four stroke.
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