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  • MattiJ
    replied
    Originally posted by Jim Stewart View Post

    None. Newton's third law as quoted in Wikipedia:

    The third law states that when one object exerts a force on a second object, that second object exerts a force that is equal in magnitude and opposite in direction on the first object.


    -js
    Now we are jumping to wrong conclusions. Net sum of forces between the umbrella and the blower are zero but we still have to remember the thrust generated with the airflow/air mass.

    Bucket thrust reverser is about the same idea:

    Leave a comment:


  • A.K. Boomer
    replied
    Originally posted by Willy View Post

    I don't know AK, sounds to me he hooked another one.
    No - that statement stands --- very surprised as in in disbelief,,,

    it's too much benefit and im glad I stated that... I knew what was happening from the get go --- But ---

    Also glad I did not write it off as total nonsense --- as in your quote and I quote; " May as well use a cordless blower and recover the energy by using a wind powered generator to charge the batteries. Physics be damned."


    You do know propulsion can be had this way right? right?

    just making sure you, tomato coupe and fasttrack know the basics, no harm done...

    Leave a comment:


  • reggie_obe
    replied
    Originally posted by darryl View Post
    I'm waiting for Musk to put some propellers on his cars to generate energy to run the car. The faster you go, the faster the prop turns, so the faster you go. It wouldn't be 0 to 60 in 2 seconds, but it could be LA to New York non-stop.
    While it hasn't yet been tried, it has been written about in a book written by ex-astronaut Addison 'Skip' Carmichael: The Trans-Linear Vector Principle

    Leave a comment:


  • The Artful Bodger
    replied
    Originally posted by The Artful Bodger View Post
    Too much of the essence of the thing would be lost if without the umbrella!
    .........

    Leave a comment:


  • Willy
    replied
    Originally posted by A.K. Boomer View Post
    There's allot going on there - at first glance it seems to defy propulsion physics as the unit itself is creating backward reaction and also the reverse thrust must be hitting the guy directly,,, I am surprised by the amount that's harvested for actual propulsion....

    any way you look at it - one little pothole and that guys going to bloody his pug....
    I don't know AK, sounds to me he hooked another one.

    Leave a comment:


  • nickel-city-fab
    replied
    Originally posted by aostling View Post
    Having been fooled, I'd like to know by how much. Does anybody have a leaf blower and an unpowered skateboard (or little red wagon)? How much headway, if any, can be obtained by blowing on an umbrella?
    I tried it when i was a bored teen in 1983. The neighbor's dog had a more useful torque curve. She would also fetch a beer if you said "Molson"

    Leave a comment:


  • Jim Stewart
    replied
    You underestimate Darryl. Very droll, Darryl!

    -js

    Leave a comment:


  • A.K. Boomer
    replied
    Originally posted by darryl View Post
    I'm waiting for Musk to put some propellers on his cars to generate energy to run the car. The faster you go, the faster the prop turns, so the faster you go. It wouldn't be 0 to 60 in 2 seconds, but it could be LA to New York non-stop.
    Jim --- with Darryls chime in make that 4 or 5... id call that a good day,

    Remember when I stated in my first post "there's allot going on there" lol that was that third law of physics you cued in on,,, it's easy to see the cancellation of the two first laws,,, but bottom line is connect wind meters all around the guy and tell me which direction it's a blowin, lol

    Leave a comment:


  • darryl
    replied
    I'm waiting for Musk to put some propellers on his cars to generate energy to run the car. The faster you go, the faster the prop turns, so the faster you go. It wouldn't be 0 to 60 in 2 seconds, but it could be LA to New York non-stop.

    Leave a comment:


  • A.K. Boomer
    replied
    Originally posted by Jim Stewart View Post

    Oh dear. Did I spoil the fun?
    Not totally - I think we netted at least 3 --- maybe 4 lol

    Leave a comment:


  • Jim Stewart
    replied
    Originally posted by A.K. Boomer View Post

    You Sir deserve a gold star, and it's why I wrote my first response so carefully, I do wish this could have played out more to separate the "who's who" in the physics department lol More later...
    Oh dear. Did I spoil the fun?

    Leave a comment:


  • A.K. Boomer
    replied
    Originally posted by Jim Stewart View Post

    None. Newton's third law as quoted in Wikipedia:

    The third law states that when one object exerts a force on a second object, that second object exerts a force that is equal in magnitude and opposite in direction on the first object.


    -js
    You Sir deserve a gold star, and it's why I wrote my first response so carefully, I do wish this could have played out more to separate the "who's who" in the physics department lol More later...

    Leave a comment:


  • Jim Stewart
    replied
    Originally posted by aostling View Post
    Having been fooled, I'd like to know by how much. Does anybody have a leaf blower and an unpowered skateboard (or little red wagon)? How much headway, if any, can be obtained by blowing on an umbrella?
    None. Newton's third law as quoted in Wikipedia:

    The third law states that when one object exerts a force on a second object, that second object exerts a force that is equal in magnitude and opposite in direction on the first object.


    -js

    Leave a comment:


  • aostling
    replied
    Having been fooled, I'd like to know by how much. Does anybody have a leaf blower and an unpowered skateboard (or little red wagon)? How much headway, if any, can be obtained by blowing on an umbrella?

    Leave a comment:


  • BCRider
    replied
    Originally posted by Lew Hartswick View Post
    I don't see any BRAKES. :-)
    ...lew...
    Simple, just shift the umbrella up or to the sides and out of the way of the blower's blast... VOILA! Thrust braking ! !

    I suspect that it's the reversal thing too thanks to the back curl of the umbrella. It may not work at all and certainly not as well if the umbrella was just a flat plate.

    Leave a comment:

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