user
23-01-2006, 17:57
What would be nice too is to see the superficial speed of the rotor printed out on the digital counter.
EG: the rotor has a 5 cm diameter. So the girth is 3.14*0.05 = 0.157 cm. Then, multiply this number by the RPM. Say you are running at 11000 RPM. The speed of the rotor if it were to be in contact against the ground would be:
11000 (RPM) * 0.157 cm * 60 minutes / 1000 =
103 Km/h or 64 Mph.
Pathetic. You could get ticketed for driving your powerball way too fast you know :-)
To have a quick estimation of your speed in km/m, just apply the following rule: divide by 100 your speed in RPM, then remove 10%.
EG: you are running at 7000 RPM, so 7000/100 = 70, then remove 10%, that is 70 - 7 = 63 Km/h.
That's a conservative method, so in fact u'll be a lil bit faster than 63 km/h (65 km/h in fact)
Matt
EG: the rotor has a 5 cm diameter. So the girth is 3.14*0.05 = 0.157 cm. Then, multiply this number by the RPM. Say you are running at 11000 RPM. The speed of the rotor if it were to be in contact against the ground would be:
11000 (RPM) * 0.157 cm * 60 minutes / 1000 =
103 Km/h or 64 Mph.
Pathetic. You could get ticketed for driving your powerball way too fast you know :-)
To have a quick estimation of your speed in km/m, just apply the following rule: divide by 100 your speed in RPM, then remove 10%.
EG: you are running at 7000 RPM, so 7000/100 = 70, then remove 10%, that is 70 - 7 = 63 Km/h.
That's a conservative method, so in fact u'll be a lil bit faster than 63 km/h (65 km/h in fact)
Matt