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  1. L

    How much do these type of flaps increase drag?

    if the flaps are fully retracted and theta is equal 0 that would mean the equation is equal to 0? is sin^2(theta) a trig identity? why am i get syntax error on calculator?
  2. L

    How much do these type of flaps increase drag?

    thanks, just what im looking for... is sin theta the flap angle? it says the change in drag coeffcient is equal to, so do i add this on to the original drag of the aerofoil?
  3. L

    How much do these type of flaps increase drag?

    by how much will single-slotted Fowler-type flaps increase the drag coefficient of an aerofoil?
  4. L

    How much do spoilers increase drag coefficient?

    i am modelling the braking system. so i need to know how much drag the spoilers provide to enhance my model
  5. L

    How much do spoilers increase drag coefficient?

    what do you mean by outside sources?
  6. L

    How much do spoilers increase drag coefficient?

    Approximetly how much is the drag coefficient if orginally the coefficient is 0.02689. I know it depends on aircraft etc but im only looking a rough estimate.
  7. L

    Projectile graph help

    i have produced a graph vertical against horizontal distance. However when the projectile angle is closest to angle of 0 it goes the furthest,what is the problem here. Is the horizontal speed for projectile with drag remain Vcos(theta)?
  8. L

    Projectile graph help

    no it isnt, i woud like to plot the angle against displacement, how hard is that to do? do i need to know the object mass and surface area (to work out Cd) to find it?
  9. L

    Projectile graph help

    or how can i find the angle launched from a vertical vs horizontal displacement graph?
  10. L

    Projectile graph help

    i used calculus to derive the equations knowing gravity and initial velocity and angle. for drag: I have calculated the horizontal and vertical distances but is there a way where i can combine these two and use theta in the equation to insert the projectile angle?
  11. L

    Projectile graph help

    yes i mean total range, can anyone help me out? so basically im looking foir an equation for total range of a projectile with drag
  12. L

    Projectile graph help

    yes i mean total range, can anyone help me out? so basically im looking foir an equation for total range of a projectile with drag
  13. L

    Projectile graph help

    i know how to plot horizontal dispacement (x axis) against vertical displacement (y axis) but i want to plot displacement (x axis) vs theta (y axis)?
  14. L

    Finding Projectile distance

    i am looking to find the projectile distance if an object (any object) was launched at 50 degrees considering the only information i know is u and v and theta (50) can someone help me out on the formula i need in order to calculate the range?
  15. L

    Engineering 3 phase circuit

    so is 15.1 the correct answer, what explains the non zero value other than its unbalanced?
  16. L

    Engineering 3 phase circuit

    so its 115/squareroot(7^2+3^2) = 15.1? but that is the same as the line current :S:S
  17. L

    Engineering 3 phase circuit

    squareroot(14^2 + 6^2) = 15.23
  18. L

    Engineering 3 phase circuit

    yes it is a typo it is -263.2. I only need the magnitude do i not? just to find the amps in the neutral wire though and the magnitude is the same for each phase i get it to be 7.62A?
  19. L

    Engineering 3 phase circuit

    yes and it is 7+j3
  20. L

    Engineering 3 phase circuit

    sorry jus realised the impedance is 7+3j. i have worked out the phases to be Z1 is -23.2, Z2 is -143.2 and Z3 is 263.2
  21. L

    Engineering 3 phase circuit

    do i need to know the phases to work out the current in the nuetral wire?
  22. L

    Engineering 3 phase circuit

    as far as i am aware it is now an unbalanced load meaning the current of R, Y and B is Ir+Ib+Ic???and im sure the impedance 3+7j is needed to work it out to.
  23. L

    Engineering 3 phase circuit

    both. i attached an ammeter to the neutral wire and i put an access wire from the input of the ac power suplly to the out R and i have got a reading, but i need to hand calculate it.
  24. L

    Engineering 3 phase circuit

    https://www.physicsforums.com/attachment.php?attachmentid=18054&d=1237464777 that should work
  25. L

    Engineering 3 phase circuit

    https://www.physicsforums.com/attachment [Broken].... how do i measure the current flow threw the neutral wire if phase R is open circuited? the impedance per load is 3+7j
  26. L

    3 phase circuit

    how do i measure the current flow threw the neutral wire if phase R is open circuited? the impedance per load is 3+7j
  27. L

    Matlab 3d graph

    i can produce 2d graphs with my code but i need to produce 3d aswell, is there no easy way i can produce a 3d graph?
  28. L

    2nd Order system Matlab

    What are the commands to i find the peak time, seetling time, rise time and maximum overshoot of a second order system in matlab?
  29. L

    Matlab Plot

    How do i plot an output response curve when input unit steps are (undamped natural frequency is normalised to 1): damping ration = 0, 0.1, 0.4,0.6,0.8,0.9 1 and 2 1) how do i plot a 2d plot for all curves on same graph. Time scale 0 - 10, steps of 0.2 seconds. 2) How do i make use of a 'for...
  30. L

    Matlab question help?

    how can i find the answers to the attached file using matlab. if i cannot use matlab how do i solve the questions? thanks
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