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  1. lostcoyote

    Mounting your battery, Center of Gravity.

    papa, you should include the rider because the rider is an integral part of the system under study from a dynamic riding point of reference.... and as safe stated, the rider does shift around his or her body weight. i know for me, when going downhill, i'm sitting back while going up, i'm more...
  2. lostcoyote

    Mounting your battery, Center of Gravity.

    that's right... but keep in mind the sun's mass is "spread out" and it rotates just fine, just as jupiter and the earth. what you will need to start addressing is moment of rotational inertia. btw, the discussion of weight distribution & it's effect on tire loading (and yes, traction, steering...
  3. lostcoyote

    Post your Pets here!

    here's 3 of em... jj, smokr, and mando... and anudder shot of jj... and anudder shot of mando... here's saler, not pictured above... i even took em' backpakin' last year...
  4. lostcoyote

    Mounting your battery, Center of Gravity.

    yep, go back to the posts stamped at: Mon, Sept 15, 2008 at 6:45PM and Fri, Sept 19, 2008 at 4:18PM safe, your model assumes the shape is homogenous to the extent that the (differential) density is consistant throughout the body.
  5. lostcoyote

    Does anybody know anything about the batt for the Zero MC EV

    they will be at the expo this coming weekend in santa monica.... in case anyone in so. cal is nearby and wants to see them person to person.
  6. lostcoyote

    Safe's Electric Bike Project #003

    have you thought about reversing the motor by putting a fixed motor sprocket on the left side of the wheel and make the right side a freewheel? that would give you the option of pedaling with the motor or using the pedals as "foot holds" while the motor works. wondering what led you to this...
  7. lostcoyote

    Bike racks.

    thanks :D i'll look into it.
  8. lostcoyote

    Mounting your battery, Center of Gravity.

    bingo! (challenge to safe: let's see if safe can draw a PROPER 2-d vector diagram of this.)
  9. lostcoyote

    Mounting your battery, Center of Gravity.

    consider that in a turn, the wheel axis are not parallel. your diagram is 2-d and does not reflect reality
  10. lostcoyote

    Mounting your battery, Center of Gravity.

    nice try safe. but your attempt to manipulate yourself into a teacher position is failing when you can't even get the vector diagram correct. you see safe, when you make condenscending remarks like this: "(are you just being a "pain in the ass" or are you really confused.... come on.... be...
  11. lostcoyote

    Mounting your battery, Center of Gravity.

    well, if that's truly the case, then properly explain traction and draw a proper vector diagram for a bike going through a turn. (hint, draw the forces exerted upon the bike at the contact points by the earth) please spare us the agony of having to sift through it all.
  12. lostcoyote

    Mounting your battery, Center of Gravity.

    oh really? a 25,000 pound truck is headed for a solid wall at 70mph and hits the brakes. it begins to skid. do ya have 25,000 pounds of force as traction? what if it's in sand?, black ice? pavement? furthermore, how about if the speeds is difverent,,, say, 10mph verses 70mph in the above...
  13. lostcoyote

    Bike racks.

    i've got 4 dogs to take out soon with my bike. worked on my bike maintenance yesterday (bleeding brakes) and so the bike's ready to go.... all i need is a rack. i just got a 2" hitch installed on my pickup (tacoma) and so i am looking for a rack that can fold down nicely which will let me drop...
  14. lostcoyote

    Bike racks.

    is this it? http://www.swagmanbikeracks.com/shopnew/product.php?productid=16228&cat=253&page=1 http://www.swagmanbikeracks.com/shopnew/product.php?productid=16241&cat=0&page=1&featured http://www.hitchestogo.com/images/Bike%20Carrier%20016.jpg
  15. lostcoyote

    Safe's Electric Bike Project #003

    we have similar issues with RC airplanes. the air enters thru the front of the engine cowling and we make the exit hole roughly 2x larger than the intakes. the point is to make sure air flows across the motor. you may or may not need to include baffles to direct the airflow where you want...
  16. lostcoyote

    Mounting your battery, Center of Gravity.

    so ya couldn't tell much difference in your experiment so far? maybe 30 pounds of groceries doesn't make much of a subjective feeling that there is any difference since your own body weight dominates the loaded weight. if ya weight, say, 180 pounds, 30 pounds is only adding 20% more load and ya...
  17. lostcoyote

    Mounting your battery, Center of Gravity.

    now take your imagination further and view this within your mind in a spherical coordinate system.
  18. lostcoyote

    Mounting your battery, Center of Gravity.

    okay.... for practical purposes, the bike is in a uniform gravitational field, yes? if so, then very often, the two terms, center of G and center of M are used interchangebly.
  19. lostcoyote

    Mounting your battery, Center of Gravity.

    in that case, you can go back to the 2x6 experiment and place a scale at each end. then distrubute a load along the board and see the effect directly on the readouts.
  20. lostcoyote

    Mounting your battery, Center of Gravity.

    say wot? anchoring the rear wheel to the ground? with a chain? bolted to a bike rack or a boat anchor? last time i checked, bike tires were not anchored to the ground.... ever do a jump? or like, um, move the bike forward such that the wheels actually rotate? an anchored tire ain't gonna...
  21. lostcoyote

    Mounting your battery, Center of Gravity.

    john, have you taken any physics courses? center of gravity has to do with mass distribution and specifically, the balancing point (fulcrum or centroid)) of that volume of mass integrated over 3 dimensions.. furthermore, it is independant of whether the body of mass rests on the ground at 2,3...
  22. lostcoyote

    Mounting your battery, Center of Gravity.

  23. lostcoyote

    Mounting your battery, Center of Gravity.

    how do you add weight (on a bike) at the rear contact point? that's the surface of the tire! maybe you mean adding weight to a bike such that the force exerted at the rear contact point is greater? -confuzzed coyote
  24. lostcoyote

    Mounting your battery, Center of Gravity.

    here are a few fine examples of rolls... http://www.youtube.com/watch?v=koP4FzCy_Rs http://www.youtube.com/watch?v=-dmpTfQ7IS4 note the ground contact!
  25. lostcoyote

    Safe's Electric Bike Project #003

    it's not like it rains every single day, is it? in 3-4 days, that hurricane ike's gonnabe gone - might make for a few good days to get out between the storms. (or even this morning before it comes your way by looking at the sattelite image, you might have a 1 day window to ride)
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