Originally Posted by HughN
They were a "finger in the air", "not to scale", "the value of your investment can go down as well as up" type bodge I hasten to add!
Maybe, but the calculations i carried out were'nt.....the point was not to focus on the exact figures but to show the higher bending stress at the end of the rails.
Originally Posted by Markyboyo
I've always thought my 1300GW trailer with 1000kg capacity was a little under engineered and it is defo less rigid than I would like. It only uses 2 80*40*3 chassis rails with no additional reinforcement. Its from one of the respected manufacturers who is well regarded on here and elsewhere but I am now wondering if it is up to the job.........
I gotta admit that all the other 1300 kg trailers I have seen have top and bottom rails on each side, not just one.
I'm sure it will be fine...the case discussed in this thread involves only one particular home built trailer and dont forget, any trailer can be overloaded if it is not set-up correctly.
You have to take into account also that i never included a safety factor when working out the loadings ie: i never increased the loadings by a set percentage to take into account potential overloading, shock loading and wear on the chassis itself. By the same token though i never took into account the heavy angle bar u-bolted to the chassis rails just above the axle. As i mentioned previously, this angle bar will have a positive effect on the load handling ability of the trailer in question.
If i had to certify Jeepster's trailer i would agree that 800kg's is probably a sensible load limit as quoted by Indespension (not the 1300kgs he initially hoped for and subject of course to all components being welded together correctly).
As to why your trailer has a higher GW, this could be down to many factors like quality of steel used, set-up of the axle/rail, whether its a bunk trailer/swingbeam trailer etc...