76 x 3.2 350MPa pipe, will do the job nicely. Not quite 6mm deflection, which is less than the recommended limit of 1 in 250mm. The stress is only 120 MPa, which is a little over a third of the yield stress. Plenty big enough...... Phill. ----- Original Message ----- From: "Peter Sheppard" <psbr20252@xxxxxxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Thursday, October 13, 2005 4:15 PM Subject: [modeleng] Full size problem! > One for the mechanical engineers amongst you! > > I'm now on bio diesel with my car. I buy it in 45 gallon drums from a > local supplier. He loads it into my landrover using a forklift, I get it > out of the landie at my end using some very dubious means using a lifting > table scaffold board a acr jack and axle stands (that would probably give > the H&SE apoplexy!) > > I have an electric hoist (not yet fitted) but after two nights ago it soon > will be! It is designed to sit on a tube (and thus can slide). The span > of my car port is approximately 3m, the maximum load of the hoist is > 400kg. > > I don't know the weight of 200 litres of cooking oil, but if it were water > it would weigh 200kg, so the hoist will cope with it. > > If we assume that the design is for a maximum load of 400kg (the hoist > maximum), what sort of diameter tube will I need to prevent it flexing in > the middle, assuming a 3m span? I'll then check the size of the aperture > on the hoist and may have to reverse the question...... > > Cheers > > Peter > > > > > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email to, > modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line. > > > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.