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Thread: Realistic goals

  1. #1
    I am kinda lost on what realistic goals in terms of lateral g, acceleration g, and braking g I should set up for the car. Please take into consideration that we are a new team but also want to challenge our self into making good marks. Thank you
    Chemical engineer undergraduate at UPRM

  2. #2
    It would help if you'd explain what kind of car you are building...

    A 350kg Single Cylinder car will have different Accelerations then a 175kg 4 Zylinder car.

    With wings you (should) have higher lateral accelerations, and so on...

    As a rough number I'd say:

    1.5g lateral,
    1 g acceleration
    1.5 g braking

    That should be possible without wings.

    If you need the numbers for designing your parts, you should take different load cases (e.g. a bump) into account...
    -------------------------------------------
    Alumnus
    AMZ Racing
    ETH Zürich

    2010-2011: Suspension
    2012: Aerodynamics
    2013: Technical Lead

    2014: FSA Engineering Design Judge

  3. #3
    Searching the forum or just calculating with SkidPad and Acceleration times would also help answering your question...
    Regards,

    Tobias

    Formula Student Germany
    FSE Rules & Organisation
    http://twitter.com/TobiasMic
    http://TobiasMic.Blogspot.com

    Not many people know the difference between resolution and accuracy.

  4. #4
    We are using a 4 cylinder inline 600 cc motor. We cant specifythe weight yet but we are aiming for not more than 410 lbs. Most probably no wings.
    Chemical engineer undergraduate at UPRM

  5. #5
    Well below 410 lbs with a 4 Zylinder 600cc seems to be a very optimistic goal for a first-year team.

    To compare, a high-end 4 Zylinder 13 inch car weighs about 420 lbs and the 10 inch Stuttgart car from 2012 weighs just over 400 lbs.

    So if you really can manage these numbers you should end up at a bit higher accelerations than I suggested before.

    Tobias is right.. go to formulastudent.de check the 2012 combustion results in the Engineering Design (there you can get the car weights!) and then go to the Acceleration results to find out the longitudinal accerelations.

    For the Lateral, I suggest the results from Formula Student Austria (Germany is wet pad and Silverstone was also quiet wet).

    Calculate the lateral accelerations in the skidpad and add about 20% for the maximum lateral g's in AutoX or so.


    It's better then nothing.
    -------------------------------------------
    Alumnus
    AMZ Racing
    ETH Zürich

    2010-2011: Suspension
    2012: Aerodynamics
    2013: Technical Lead

    2014: FSA Engineering Design Judge

  6. #6
    Considering that your a new team I would keep things simple and aim for the following:

    lateral g > 0
    acceleration g > 0
    braking g > 0

    Keep in mind your car needs to be capable of all of the above at any given time during the competition (ie. it can't brake down) and don't underestimate just how big a challenge that is.
    Western Formula Racing
    The University of Western Ontario
    Alumnus

    "If I had one hour to save the world, I would spend 55 minutes defining the problem and only five minutes finding the solution." –Einstein, Albert

  7. #7
    Angel, at least you must rape 'newton law'. Your accelerations must be higher than one gees.

    Originally posted by kcapitano:
    Considering that your a new team I would keep things simple and aim for the following:

    lateral g > 0
    acceleration g > 0
    braking g > 0
    You are too much optimist. But 3 gees is higher than 0 gees . Great.

    Cheers

  8. #8
    I do intend to rape Newton's law.... Does anyone also know why slick tres are extremely limited in terms of brands?
    Chemical engineer undergraduate at UPRM

  9. #9
    Originally posted by Angel Maymi:
    Does anyone also know why slick tres are extremely limited in terms of brands?
    They are not Angel. Literally dozens of companies make slick tyres in the size range you need for FSAE.
    However, not manymake slick tyres that will operate optimally in the operating environment of FSAE or FS.

    At major events it is not unusual to see up to 10 different makes of tyres being used.

    At major events it is very unusual to see more than 2 different makes on the winning cars!

    Pat
    The trick is ... There is no trick!

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