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  • calculate airplane wing air drag resistance force

    Discussion in 'Calculations' started by janismm88, Apr 10, 2020.


    air drag resitance for airplane wing 4m long 1m wide 30cm high CL1.2 20m/s speed

    1. 27newtons or similar

    2. completely wrong

    3. around 90newtons

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    1. janismm88

      janismm88 New Member

      Apr 2020
      Likes Received:
      So I'm building velomobile with a frontal area of 1.5m and try to build like teardrop shape which is the most aerodynamic shape I was reading its possible to have a coefficient of drag 0.06-0.09 easy its just a correct form of car. So assuming I build a car with a coefficient of drag 0.09 and frontal area of 1.5m so far seems that air resistance would be 26newtons or I need to generate 760watts of power
      that's already impressive I can add 250w electric motor and generate myself 500w power. Anyway, maybe need 100w more for rolling resistance and drag resistance for tyres, tyres will be like bicycle tyres.

      I hope so far my calculations are +/- ok?
      BTW using carbon fibre car can be very light around 30kg easy my weight is 80kg so total weight 110kg

      Then I started to think what would happen if theoretically, I wanted that this car fly how big wings needed I came to calculation with one online website
      at 20m/s and wing area of 4m2 and CL 1.2 I should already leave the ground :) OMG lol
      when I leave ground we can minus rolling resistance, right?
      But now we have air drag resistance from wings so my big question is
      1) What shape these wings need to be to generate 1.2CL? Is it correct 4m long 1m wide and 30cm high?
      2) how to calculate wing air drag resistance? For car we calculate taking into account the frontal area plus coefficient of drag for a car
      can we apply this formula for wings? In that case frontal area is 4X0.3 1.2m2 then we need to know the coefficient of drag for wings looking at some images from Wikipedia I came to figure of around 0.09 if look at the streamlined half body which look like the shape of a wing
      So now if we put these number in drag calculator we came to result of 27newtons
      or another option we need to take into account all wing area so 4m2 in that case we have 86newton resistance but this doesn't make sense for me. Then why for car nobody calculate total surface area.
      Only when plane fly and have angle of attack lets say 10 degrees then we have more frontal area correct?

      personally seems too less that with around 1.57kw I can fly.
      or maybe yes :) or Im dreaming ?

      Of course, I need to take into account how much power is lost from an electric motor to propellers and drive train efficiency loses.
      Of course, in this case, I need to put some electric motors because with pedal powers will not be enough.

      Anyway, im just curious what power is required to take me and car off the ground :)
      So car itself is 5m long 1.5m wide 1m high coefficient of drag 0.09 total weight of car lets say 30kg and wings are 4m long 1m wide and 30cm high
      ??? If anyone wants to help with a project to build velocar welcome i can pay.
      For flying is just an idea and curiosity for later plans.

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