Definition: The ratio of torque to the weight of the moving part of an instrument is known as a torque/weight ratio. It
indexes the performance of the instrument
. The high value of the torque-weight ratio shows that even for the small value of deflecting torque, the pointer deflects and shows the measured value.
What does torque to weight ratio indicate?
Torque/Weight ration of an instrument decides
the sensitivity of an indicating instrument
. It should be high for high sensitivity of the instrument. An indicating instrument is more sensitive if its torque to weight ratio is of the order of unity.
How do you calculate torque to weight ratio?
It’s very easy to calculate a power-to-weight ratio.
Simply divide the power output of a vehicle by its weight
. For example, if you have a car that weights 2000 pounds and has 250 hp, the PWR will be as follows: 250 / 2000 = 0.125 hp for every pound of car.
What is torque to weight ratio in cars?
There’s 1 more thing to consider – the weight of the car. … So, the torque-to-weight ratio is
the perfect indicator of how well a car is going to accelerate during everyday driving without revving the guts out
.
What is a good power to weight ratio for a car?
You should be able to hit
about 6/10-8/10
of the cars performance on the street if you push it a bit, but don’t get too dangerous. So, a car with low performance, you’ll get to it’s limits before the car starts to engage you. If it performs too competently, it won’t thrill you until you’re going hazardously fast.
How do we calculate torque?
To calculate load torque,
multiply the force (F) by the distance away from the rotational axis
, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.
How much torque do I need?
Generally speaking, an impact driver with
1500–1800 in-lbs of torque
puts more emphasis on higher RPM. It will do 95% of the work more quickly than a tool with more torque and slower speeds. Our rule of thumb is that, if you need to reach for a socket adapter, you’re better off grabbing an impact wrench.
Is it better to have a higher or lower power to weight ratio?
More horsepower = more speed. … But in terms of sheer acceleration ability and speed –
the higher your power to weight ratio, the better
. That means the ideal performance car is lighter in curb weight but jacked to the hilt in horsepower.
How much weight can a 1 hp motor lift?
The constant 1 horsepower equals
550 foot-pounds per second
. In other words, 1 horsepower is the amount of work required to move a load of 550 pounds over 1 foot, in 1 second.
Does weight Affect torque?
Dividing horsepower or torque by vehicle weight will give you power to weight ratios
, which has a big impact on acceleration and performance. … The same engine can be paired with different transmissions to produce faster acceleration or pulling power by varying the gear ratios.
What is torque in a car?
Applied to internal combustion engines or electric motors,
torque indicates the force to which the drive shaft is subjected
. Torque is expressed in pound-feet (lb-ft) or newton-meters (Nm). The interaction of torque and engine speed (rpm) determines the engine power.
Which motor has highest power to weight?
The motor which has the highest power to weight ratio:
Capacitor-start motor
.
What is the KERB weight?
Kerbweight is
the weight of the vehicle including a full tank of fuel and all standard equipment
. It does not include the weight of any passengers, cargo, or optional equipment. Kerbweight is considered the closest weight to the actual weight of the vehicle.
Is 200 hp enough?
Under 200 Horsepower
Horsepower is undeniably attractive, and these days even the most basic vehicles have the horsepower necessary to pass most vehicles on the highway. As such, horsepower under 200 can be
quite good
. This level is sufficient for drivers who don’t actively seek road thrills.
How fast is 1hp?
Based on his observation of horses, Watt defined one horsepower as
33,000 foot-pounds/minute
, or 550 foot-pounds/second. In the metric system, the unit of power is the watt, which is named after Watt, and 1 horsepower is equal to 746 watts or 0.746 kilowatts.
Are lighter cars faster?
What’s clear is that a
lighter car will accelerate more or
require less force to accelerate like a heavier car. … As the acceleration is slower with a heavier car of the same power, you have to accelerate for longer (more time) to cover the same distance so you use more fuel.
