Hi and thanks for the pointer towards Graphalloy bearings. This could be very useful as long as we can achieve an excellent polished finish on the axles.
I agree with your thinking on the balance between rotating and non-rotating mass in the car. I remain convinced that this is significant in...
I have come across SPICE as a circuit simulation tool, but not thought of it as a tool for analysing mechanical systems.
We use small shielded ball bearing races 2 mm ID 5 mm OD about 2 mm wide. These have enabled us to produce some very fast cars. I would be interested in knowing about the...
I found this equation to calculate the frictional torque in ball bearing races (http://www.smbbearings.com/SMBtechdata.htm)
Frictional torque (measured in Nmm or Newton millimetres)
Radial ball bearings: 0.5 x 0.0015 x radial load in Newtons* x bearing bore (mm)
The website also quotes...
Thanks Mike
In the Bloodhound SSC class the rules are very simple, the cars must be machined from a single block of balsa wood. The wall thickness around the cylinder must be a minimum of 3 mm. The body between the from and rear axles must be a minimum of 15 mm diameter and the centre height...
Hi All
Mike, When you suggest Finite Element Analysis may be more informative than CFD could you give me a bit more of an idea how you would envision using it? My knowledge of the technique is very limited. I remember using it to simulate the decent of the lunar lander on a Teachers' course...
Hi
In the UK Denford run the competition and supply the bits and pieces. See their catalogue at http://www.denford.ltd.uk/cataloguemay09/index4.html I think Pitsco supply similar in the US. See http://shop.pitsco.com/store/default.aspx?CategoryID=84&by=9&c=1&bhcp=1
The UK competition has...
Thanks for the interest in my thread.
With regard to the effect of the size of the orifice I think this is quite controlled. A standard launch device is used which drives a spring loaded firing pin into the diaphragm so that variability has been minimized. Also the CO2 cylinders are stored at...
Hi All
Hope this is the right forum, I am looking for an applied approach!
I am interested in modelling the behaviour of CO2 powered rocket cars. These small models are powered by releasing pressurised carbon dioxide from a “sparklet” cylinder. The model cars race along 24 metre long...