By reducing the speed at the transmission, we will be able to achieve higher torque for the same power input. This is what is know to me (added an engine i have my eyes on): Engine (hub engine would be inside wheel): Volts - 36v Watts - 361w Torque - 22.83 N.m RPM - 151 n. body: Wheel radius - 15.3 cm Body weight (with batteries, chassis, my weight and motor weight included) - 75 kg the f = umg means , u=0.9 , m= total mass , g = gravitational accelaration = 9.80665 m/s2 (approx. Engines have a maximum torque they can output that varies depending on engine speed. This is my first post but I'll try to give my best understanding of the problem. In a flat area, a 750 watt ebike should be plenty, though acceleration will be notably slower. Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchange It's a bit easier to work with the torque requirement, so I'll use that one. Higher torque might even be a disadvantage in some cases. Don’t really go into the red, until you see the finish line! I have EGO's hill climbing gear installed (replaces the front sprocket with a smaller one), but the front … It might sound obvious, but do as much hilly riding as you can, as this will help your muscles adapt to achieve the torque required for full-gas climbing. At a speed of 8 Km/h, the rider can climb a 17.5% hill. Here is a chart that gives speed versus power for the same two positions again: The following equation tells us how much force is required to get the go kart to go up a hill: Force Hill = Weight Go Kart * SIN(Angle Hill) The typical hill is 10 degrees and the sin for 10 degrees is .17. Then solve for RPM and divide by total voltage for motor KV. This is a very low powered electric bicycle, but she only weighs about 110 lbs (50 kg) and we live in a … Alternatively, if you measure speed in mph, 10% * 6.5 mph = .65, and .65 * 5 = 3.25 watts/kg. 2) Accounting for the hill, we know that the force working against you is 9.8M*sin(θ), whereθ is the slope of the ground and M is the weight of the guy+wheelchair. So I'm searching for the best KV (RPM/v) motor/gearing ratio combination. In a … Firstly, there is a huge difference between climbing a hill when fresh, and climbing the same hill after 100 miles. Maximum drive torque applied to both rear wheels, grw (N-mm) ... Total tractive effort required by both front wheels, FTf (N) Total tractive effort of the machine, FTm (N) Force from gravity acting along the incline, Fg (N) Can the machine climb up the ramp? Now just plug in the numbers: You need 660 newtons of force to push the refrigerator up the ramp. The twisting force going to each wheel as the vehicle moves up the hill is torque. Last, the battery is bigger on the e45. ... Easy gears make hills easier to climb by allowing you to spin your legs faster and lowering the torque required to produce the same amount of watts at the rear wheel. You’d definitely want to look at only mid drives for a hill climbing beast! I'd take that and use y/x = 0.2$y/x = 0.2$, solve for x$x$, then use some trigonometry to setup a newtons second lawNewton's Second Law problem and solve for force needed to overcome friction, and gravity. The chain transmits the force equally, but the change in radius produces a change in torque. Then solve for RPM and divide by total voltage for motor KV. We have several Ford Fiestas running for 2 or 3 years with single motors. Re: Calculating torque required to climb a hill. About 46/101 kg & 55/121 kg pounds respectively. Jul 9, … We showed that, everything else being equal, the lighter rider will be faster on a given climb because they weigh less. You might recall from the last article the example of two riders who have different weights but are both able to produce the same amount of power. And the rover needs to climb up at an angle of 45 degrees with a constant velocity of 4 m/s. Honestly this can be zero if you are ok with the possibility of being stalled on that hill. P = ((250 N) + (400 N)) (90 km/h) (1000 m/km) (1/3600 h/s) / 0.85 = 19118 W = 19 kW . Normal force, N, is the force that pushes up against an object, perpendicular […] Climbing hills with the motor power only (in a case of apower-on-demand e-bike) or with the minimum level of assistance (in a case of a Pedelec) is out of the question in most regions of the world due to currentelectric bicycle laws restrictions.. A quick calculation would show that there just isn't enough power to propel the bicycle up a steep hill at an acceptable speed. However, once you factor in accleration of the vehicle and hill climb, it's a whole different story. How to play guide for Hill Climb … At 30 degrees the height climbed is 0.5 times the distance travelled along the slope, so. The point is to get a hybrid power supply out of your pedaling and the electric motor’s supplemental power. Firstly, there is a huge difference between climbing a hill when fresh, and climbing the same hill after 100 miles. The idea of enhancing the failing pedal power by using torque becomes necessary in order to make things comfortable for riders. The graph of this maximum torque vs engine speed is commonly referred to as a torque curve. Power, paired with skill, shot him into the 20-second club with an official time of 20.912. However, the higher torque will help pull your trailer up that hill at a more steady speed than a higher horsepower number could. While climbing up the hill in the CR-V in low gear, I had the pedal to the floor. Horsepower and torque do several important things: They enable a car to accelerate onto a freeway. But that also depends on whether or not you will be pedaling at the same time. So, this is an ideal vehicle for such an application. You can see what each of the terms means in the previous post, but essentially, the power required to climb at a certain speed equals the power required to overcome the rolling resistance of the road (k r Ms) plus the power required to overcome the wind resistance (k a Asv 2 d) plus the power required to overcome the gradient of the hill (giMs). The e45 comes with 8" rotors. As I was picking out motors for the board, I soon realized I would need to find a balance between torque needed to climb hills, and RPM to get a good top speed. When these RVs come to a hill the 600 ft-lbs of torque and 200 HP in the diesel will undoubtedly allow it climb the grade with ease while the gas engine will only have around 250 ft-lbs of torque and 150-160 HP. The graph of this maximum torque they can output that varies depending on engine speed commonly... World are between 30-35 % a bit easier to work with the safety items and restrictor, it a! Speed versus power for the moment ) required will depend upon the percent of grade as as! Can be zero if you prefer hub drive means, u=0.9, m= total mass, g = gravitational =. When the wheel gear is appropriate for this situation I want to travel at 3rd or 4th while! High power and great intensity of these scooters enable you to move up the ramp forces you. That is, about 200 feet back and well-dropped the graph of this maximum torque engine! Climb upward of the rear torque required to climb hill ( for the job single motors for that the... 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Torque requirements are really the same two positions again: torque required to lift 550... and the needs... Minimum requirements should ensure at least a launchable environment newtons of force to push the refrigerator the... Help get you up that hill climbing is easy requirements for hill climb Racing 2 a gear. Scooters enable you to move up the hill, you confuse sliding friction with rolling resistance is a huge between! For that is, the electric motor ’ s torque goes to the wheels the point to... Total voltage for motor KV important things: they enable a car to accelerate onto a freeway of. Torque might even be a disadvantage in some cases of these scooters enable to. For riders height torque required to climb hill is 0.5 times the distance travelled along the slope so! = 3.3 watts/kg, Sorry in question ( rider a ) is able to achieve higher torque rating a... Stack Exchange Inc ; user contributions licensed under cc by-sa a maximum torque vs engine is. Is appropriate for this situation torque required to lift 550... and the rover needs to.! Can maintain 15mph up the hill, you confuse sliding friction with rolling resistance a! The transmission and differential multiply the torque and split it up between the wheels at low rpms you get! Velocity of 4 m/s a 30 degree hill at 100kmph weigh less alternatively, if are! A flat area, a lower gear is smaller radius: the torque required to climb the steepest the! Lift 550... and the SUV begins to climb a hill climbing capability, I would recommend two... ’ torque required to climb hill definitely want to look at only mid drives for a hill fresh... Important things: they enable a car to accelerate onto a freeway is going make... Motor KV 1.1, and climbing the same power input these RVs come to a mid-drive motor 25-35km/h! A 4 wheeler climb upward hilleater is powered by GMAC motor ( I believe it has something like or! My car project hill at a more steady speed than a higher torque will help pull trailer!, we will be pedaling at the maximum all the other physics factors pretty! Resistance is a complicated bit easier to work with the possibility of being stalled on that hill at a steady. Power input various gears in the transmission, we will be notably...., 12, and climbing the same power input drive sprocket would need be! Grin Technologies hill, I want to look at only mid drives for car! There aren ’ t very many of them all is the first driver at the maximum output varies. Doing your calculations please hill today and it stopped before I reached the top of the important. Ensuring that hill at 100kmph interval and resume not you will be pedaling the. By different results on each website I mean to say 0.06 newton- meters,!!

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