Writing Feedback / A SMART BIRD - how he manages to fly without rotating parts - just by flapping his wings? [3]

The development of era is more advanced technologies .Such as, A bird is very agile to fly does not with rotating component .but,they fly by flapping its wings.

Propulsion components can be flied a bird is including a wingpan of about two metres,the length is one meter and and six and the weight ,it is only 450 grams ,carbon fiber,motor is in the middle,gear,three hall sensors.

Overall,it still rises up passive torsion to active torsion from 30% up to 80%.the next, it has to do is to control and regulate it. In order to get aerodynamic more efficiently

Writing Feedback / In the 1841, some trains used a oil lamp with curved reflector [4]

IELTS SUMMARY MONTH; FIRST HEADLAMPS

Transportation is the one of crucial usable access in worldwide. There are numerous kind of public transportations are train,bus or similar of it.Specifically ,the progamable train progress is currently equipped by major firm .Time to time,for the past time up to now of example: in 1841 ,some trains used a oil lamp backed by curved reflector .So ,in 1841 ,the first electric headlamp was developed where it also being -increased rapidly

In beside of that,the train is able to be affordrable transportation and safier of big avenue of harmful accidental accident.To inhibit the myriad victims ,it equipped with a battery-powered electric headlamp

On several decades as we know that the train transportation is being developing significantly where the past time there was not a headlamp to be appeared headlamp .Subsequently, we will not predict the consecutive development of era that it would become what