Recent content by motivehunter

Assuming there is perfect traction, I can think of a way. Start off with the equation Torque = Moment of Inertia * Angular acceleration...E1 For each gear ratio, within the rpm of gear change, for each speed, calculate the torque based on the corresponding power value using Torque =...

Thank you so much!

Hi all! Excuse the simple nature of this question, but I'm a mechanical engineer working on building his own PAS bicycle and need to understand this to go ahead with my work. I understand that a 12V 7.2 Ah battery ideally discharges 7.2 ampere of current at a nominal voltage of 12V for 1...

Hi! In a speed-reduction drive, because the power transmitted is almost constant, as the speed decreases the torque increases. Is this reduced rear wheel/shaft speed the same when the loaded condition is considered? Let's assume that the prime mover is rated to produce 1.4 mN torque at...

But can't we assess the accuracy without considering 'problems'? Can't one method be superior to another in all possible ways?

Hi! Suppose we are required to analyse the general tendency of a set of joined line segments (to increase or decrease) as shown in the figure, which would be a more accurate method? 1.) Take individual slopes of each line segment and compute the average of all such slopes. 2.)...

When a bicycle just starts to move, it's wheels just about begin to roll. In this case, is it proper to consider rolling friction or sliding friction?

Once again, thanks a lot. That helped make so many things clear!

Thanks a lot! Makes more sense now. Curious: given any motorcycle engine's power curve, can't I plot its torque curve using P = T\omega ?

1. Why should I include the inertia force? Isn't the inertia force actually equal to the sum of the grade, drag and rolling resistances? 2. How will the power always be constant? Motorcycles develop their maximum power at certain speeds like 125hp at 7500 rpm etc. Don't power, torque and rpm...

Hi! Thank you for your reply. I understand that you're saying that any torque value can be achieved by using an appropriate reduction ratio for a given power output? So then the maximum power output will be shifted to a lower speed (rpm) as the torque is increased. Is my understanding...

Hi everyone, I just completed my bachelor's in mechanical engineering and have taken up a small project which involves a pedal assisted bicycle operating on both torque and cadence values. Having completed the design and relevant estimations, I have now gotten stuck at a problem which...