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Math Help - Flying

  1. #1
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    Flying

    hi all, i was thinking today about flying and jetpacks what not you get the idea long story short i need math help, lol


    i weight 375lbs at most
    so before i can even get off the ground i need 375lbs of thrust, but from there i need to be able to climb 50 feet into the air to avoid buildings etc can someone help me out i have no idea where to start on this one

    do i work it out lb's per square inch or what, how do i calculate the amount of force needed to climb each foot anyone able to help me on this? also i need to be able to fly for about 2 hours max
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Memorex View Post
    hi all, i was thinking today about flying and jetpacks what not you get the idea long story short i need math help, lol


    i weight 375lbs at most
    so before i can even get off the ground i need 375lbs of thrust, but from there i need to be able to climb 50 feet into the air to avoid buildings etc can someone help me out i have no idea where to start on this one

    do i work it out lb's per square inch or what, how do i calculate the amount of force needed to climb each foot anyone able to help me on this? also i need to be able to fly for about 2 hours max
    All you technically need is just a little bit of thrust more than your weight (plus the weight of the jetpack, of course.) If you want to get to a height of 50 ft before you are 90 years old, you will probably want a bit more thrust than that.

    Answer this question to yourself: How much time do you want it to take to get to 50 ft? Then employ y = \frac{1}{2}at^2 to find the required acceleration, then \sum F = ma to find the required thrust.

    -Dan
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  3. #3
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    Quote Originally Posted by topsquark View Post

    Answer this question to yourself: How much time do you want it to take to get to 50 ft? Then employ y = \frac{1}{2}at^2 to find the required acceleration, then \sum F = ma to find the required thrust.

    -Dan

    thanks for the reply dan but theres one problem i don't understand any of those equasions at all sorry but its just gibberish to me i haven't done any form of math other then basic for the last 6 months the math part of my brain looks like a decayed fish, but i was thinking getting to 50ft in the space of a minute


    (if you tell me how the equasions work i can do it from there )(like y = force or what ever)
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by topsquark View Post
    Answer this question to yourself: How much time do you want it to take to get to 50 ft? Then employ y = \frac{1}{2}at^2 to find the required acceleration, then \sum F = ma to find the required thrust.
    \sum F = ma

    T - w = ma

    Tg - wg = mga

    Tg - wg = wa

    T = \frac{w(a - g)}{g}
    where T is your thrust, w is your weight, a is your acceleration, and g = 32 ft/s^2.

    You wish to get to 50 ft. in a time t:
    y = \frac{1}{2}at^2

    50 = \frac{1}{2}at^2

    a = \frac{2 \cdot 50}{t^2}

    a = \frac{100}{t^2}
    where a is the acceleration and t is the desired time to reach 50 ft.

    So plug in your desired time and you get a. Plug in a and the weight into your thrust equation and you'll get the thrust you need.

    -Dan
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  5. #5
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    wow that just made my migrain worse, add me on msn "stealthangel401@hotmail.com"
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