So, NIB magnets have a way higher compressive strength (950 MPa) than tensile strength (75 MPa). As you spin it the outer edge is under greater compressive force, while the inner edge is in greater tensile force. So how does it fail at max RPM, by breaking apart or by powderizing itself? Tension...
Interesting device and research. Cool to know that 80% of the heat was captured. Now industry could really benefit from a turbine that can condense working fluids as part of the thermal cycle. So much energy is wasted on running condensers and pumps to move still-hot, energy-dense steam.
Thanks, that is a great link. It's amazing how many losses there are in ICE/mechanical systems! If someone could capture that waste heat and send it to an electric motor in a hybrid setup, that would improve economy tremendously.
So to calculate power required I would need to find engine torque at the wheel and then divide out wheel radius, right? And subtract from that the force of drag and friction?
Hello PF, I have a problem that I cannot solve.
Assuming my car weighs 4000 pounds with passengers and cargo and is traveling at 100 feet per second, this requires 4000lb*100ft/s = 400,000 ft-lb/s or 727.3 hp of work. But I know the engine is only producing about 50 or 60 hp, and I'm...
My goal is 45 MPG at 75 MPH, but I will take a hit there if it means the difference between getting across town in a snow storm or not.
The gear ratios are, for the 6MT:
1: 3.454
2: 1.888
3: 1.062
4: 0.785
5: 0.634
6: 0.557
R: 3.636
F: 4.444
For the CVT it is 3.505:1 to 0.582:1 with a final...
Right, this is why I was thinking that a quick and easy way to get a big economy boost would be to swap the differential from a 4.444:1 to a 3:1 or lower (which may need to be machined, I need to look into this more). This would keep my highway cruising speed in 6th gear between 55 mph and 72...
Greetings, mechanical engineers of Physicsforums,
I have been struggling with a particular problem calculating an ideal motor RPM for economical highway cruising.
The motor I am looking at is the Subaru EE20 Diesel motor. Its torque curve can be found here...