is there any certain pay load ratio
Answers
Answer:
In aerospace engineering, payload fraction is a common term used to characterize the efficiency of a particular design. Payload fraction is calculated by dividing the weight of the payload by the takeoff weight of aircraft. Fuel represents a considerable amount of the overall takeoff weight, and for shorter trips it is quite common to load less fuel in order to carry a lighter load. For this reason the useful load fraction calculates a similar number, but based on the combined weight of the payload and fuel together.
Propeller-driven airliners had useful load fractions on the order of 25-35%. Modern jet airliners have considerably higher useful load fractions, on the order of 45-55%.
For spacecraft the payload fraction is often less than 1%, while the useful load fraction is perhaps 90%. In this case the useful load fraction is not a useful term, because spacecraft typically can't reach orbit without a full fuel load. For this reason the related termpropellant mass fraction, is used instead. However, if the latter is large, the payload can only be small.
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Answer:
A person weighing 70kg travelling in a car weighing 1000kg represents a payload ratio (PR) of 7% (see the box on the right for the arithmetic). This is a very inefficient method of transport. A 70kg person travelling on a 20kg bicycle has a PR of 350%; much more efficient. The same 70kg person in a 2 tonne vehicle has a PR of only 3.5%!
The payload ratio is calculated by dividing the weight of the payload - the passenger - by the weight of the vehicle. In the case of the 1000kg car, 70/1000=0.07, which converts to 7%.
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