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fly_tornado

JabirWatt eSTOL

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The Custer channel wing showed how much lift can be improved by speeding up the airflow over the top.

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He thinks the reader doesn't understand power and energy. 50kW is a rate of energy consumption.  It tells you nothing about how much energy you need.  Like saying how you live only 50 km/hr from the city.

But the Jabiru is interesting...  I wonder about the placing of the ducted fans , they look to be too few and not spaced properly.

And I would think that a "blown" wing would be quite a specialized airfoil with a built-in duct system.  I imagine a pipe inside the leading edge with a slot at about 5% chord blowing air back over the upper surface.

Thanks for the info Turbs.

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There is a good story " NASA remakes the airplane wing with a whole lot of propellers". They are modifying a Technam to a blown wing with 12 electric motors on the leading edge.  

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50 Kw is a quantum of energy. 50 Km is a quantum of distance. The rate would still need a "time" element ie /Hr  /day .etc in both instances.

  Wing mounted  propeller engines have always blown wings as the centre engine blows the tailfeathers,,making them more effective. at lower speeds..Nev

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Exactly right Nev. A kWh is 3,600kJ of energy. A kW can be any amount depending on the time.

I never thought of the DC3 as having a blown wing but it really has. And more so for the DC4.

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Wasnt it indicated that the kw used was to get the thing airbourne

ie 50 kw per take off?

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 A certain amount of thrust (force) will get you flying ie overcome drag. Work is done when the force applies over a distance. W  = F x s .Nev

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Different times for different flight methods, its a measure of energy used

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