I appreciate that, I will figure out a way to test it. My thoughts are a 3hp motor, and just mount the brake rotor to the shaft and turn it on and measure the time and final rpm. I don’t have to match my speed of 1500 rpm since I can just use the formula that was written. The correct one.
No one has decided anything, do you agree with any of the torque and horsepower answers? No need to dodge around question by saying what is useful or what has been done or not been done. Everyone already gets that.
I’m asking a question regarding torque and horsepower based on the weight and...
I'll try not to do that, just didn't want repeat questions from the initial post, i'll put the edits in the footnotes. Can you help on the calculation, Greg got around 2Hp, I got around 30 Hp.
I'm just changing when i want to do the accelerating and decelerating and over a different period of time. Linearly doesn't matter because the vehicle has to carry that load no matter what, i'm asking for the calculation of what the engine needs to turn that brake rotor.
I’m okay on the inertia being the same any place but the force or in my case the torque and horsepower required to accelerate the 30 some pound rotor disc from 700rpm to 1500rpm in 4 seconds is about 2Hp?
What Chatgpt drew up looks just like an electric motor with some screws going every which way that I said it was strange but it’s just an illustration, the actual modes Chatgpt came up with is written after the illustration.
Getting back to the system and calculations, yes you can use the...
Correct. I think even 0-60mph(0 rpm to 700 wheel rpm), if you don't need the brake, and the brake rotor is free wheeling, I think it will free up some horsepower.
Respectively no thanks. I'm going to stick to my numbers so we can all stay on the same page and get the right calculation.
Going back to Gregs calculation, using all metric and mass units,
"T=21*.6=12 Nm
Hence power is 115*12 W, about 1.5 kW, or 2 hp"
It takes 2Hp, to rotate a brake rotor...
This seems more reasonable, thank you. Should you use gravity acceleration when doing metric? which would be .6 kg/m^2 x 9.81 m/s^2, which gets you to 5.8 N/m^2 multiply this by acceleration 21 rad/sec gets you 123.6 Nm or 90 ft-lb.
Then i should complain to this calculator
https://www.omnicalculator.com/physics/mass-moment-of-inertia
What unit would you prefer the calculator has most of them?
15” rotors are pretty heavy. I think it’s not uncommon these days. Camaro’s have 390mm discs. But back to the calculations, anything look off to you all? ( the rotor is weight is exact, unless my digital scale is wrong)
As I stated, the rotor is fully locked with the wheel when the system is engaged. Doesn't matter if you're going in reverse or not. Think of a dog gear teeth on a gear, (one set on the rotor and other set on the wheel hub) ignore the synchros for now:
I'm not sure if you're getting what I wrote, the system disengages and engages, so there is no moving backwards because rotor is fully locked with the wheel hub when the system engages. I'm talking about non braking events. It better be locked when you brake(reason you want it normally...
The wheel tire combo is 49.3lbs, versus 31.4 lbs brake rotor, that has a good amount of inertia, 45.64ft-lbs^2 versus 8.36ft-lbs^2(brake rotor), but are my numbers correct?. Which then equates to the tire/wheel (49lbs, outer radius 14" and inner 8.5"), taking 942.75lb⋅ft and 197hp, so i feel...
Thank you, no one said anything about the wheel or braking or slowing the entire car. asking about the rotor.
I’m asking about the turning the brake rotor and what it takes to get it turning. Obviously the rotor accelerates with the car, but that’s a linear motion and will be there no matter...
sorry some just online calculators
Moment of inertia of a hollow cylinder.
https://www.omnicalculator.com/physics/mass-moment-of-inertia
answer 8.36ft-lbs^2
The rest are pretty straight forward. Chatgpt gave the same answers as the calculators. Site needs an equation editor to make it easier...
Hello, I wanted to see if it would be possible to create an anti-lock brake rotor that would unlock on non-braking events to free up the power it takes to spin them to speed.
But my numbers seem pretty high. My calculation
Taking a typical Shelby GT500 brake rotor(I know you all have these...
I simply used Hookes law, 100mm initial length, 90mm final length, and a 250lb spring.
Does it really matter? I'm really trying to get to the force created by a jack hammer and some values close to the Home Depot jack hammer rating. Could be 600lb, 300 or whatever, but if others area reading...
Interlinking is an old concept, if the front lifts, the weight shifts to the rear, but instead of shifting it to the rear, you have a separate passive hydraulic circuit so whenever the rear compresses, that circuit sends force back to the front to keep the front springs compressed and the car...
