1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Stuck on how to calculate the angle of lip on fishing lure

  1. Jul 2, 2012 #1
    1. The problem statement, all variables and given/known data

    Hello friend, i really stuck on how to calculate this thing. I have to find the drag force and lift force acting on fishing lure. By the way, the fishing lure has lip and there an angle on the lip.I am sorry my english is bad but i hope you can understand what i am trying to tell you guys. I am also attached a free body diagram so guys you can take a look to make better understand.

    I simulated the fishing lure on Ansys and run in fluid of water. The data as below.

    Water velocity = 0.59 m/s
    Acceleration, a = 0.02 m/s^2
    Volume of water = 0.050348 m^3
    Water Density = 998.2 kg/m^3

    mass of fishing lure =0.01820 kg
    Weight of fishing lure = mg = 0.1785 N
    Volume of fishing lure = 0.000018196 m^3
    wetted area = 0.00452120 m^2
    Buoyancy Force = 0.1782 N
    Lip angle (as in free body diagram ) = 63°

    2. Relevant equations

    Ok friend, here is my calculation. I use mass of water that flow and hit the fishing lure.

    For x component.


    F cos 63 = Drag

    ma cos 63 = Drag

    mass of water = density x (volume of water - volume of lure)

    so, mass of water = ( 998.2 )(0.050348 - 0.000018196 ) = 50.2392

    So, (50.2392)( 0.02) cos 63 = 0.4562 N

    So, the drag force i got is 0.4562.

    Using this Cd = Drag / 0.5 p A V^2 = 0.58

    For y-component

    Lift + Fb - W + F sin 63 = 0

    W - Fb- F sin 63 = Lift

    0.1785 - 0.1782 - (998.2)(0.050348 - 0.000018196 ) sin 63 = Lift

    so, the lift force = - 0.895 ( - sign show the lift acting downward as the lure will dive )

    Using this CL = lift / 0.5 p A V^2 = -1.14

    3. The attempt at a solution

    My problem is, i think something wrong on my equation in x component and y component especially on cos and sin...guys, can you correct me plzzzz..
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted