Newbie Help Whats The Go With Higher S Ratings?

Discussion in 'The Chat Room' started by simon, Jul 30, 2014.

By simon on Jul 30, 2014 at 9:13 AM
  1. simon

    simon Well-Known Member

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    Okay, I don't mind asking the dumb questions so here I go.

    Why is a 6S 450 better than a 3S 450, or a 14S 700 better than a 12S 700 (or for some wild men out there a 24S 700 better than a 12S 700 - you know who you are!).
    Seems to me like you choose a lower kV motor to achieve the same headspeed, I can see that the power density is a little greater in 6S packs compared to a 3S, (talking 450's here), but shouldn't that give you a longer flight time - why more power if you are running at similar head speeds?
    Simon
     

Comments

Discussion in 'The Chat Room' started by simon, Jul 30, 2014.

    1. feral

      feral Well-Known Member

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      Less amp draw and load on your electronics allows everything to work more efficiently resulting in more power
       
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    2. simon

      simon Well-Known Member

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      I know we are pulling less amps, but about the same watts (vA), and about the same headspeed, so why more power?
      Simon
       
    3. Freeko

      Freeko Member

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      Running at twice the voltage means you will only need half the current to deliver the same power. Not as much energy is wasted as heat, your ESC doesn't work near as hard, and probably the most important part is your battery voltage will not sag from delivering too much current! More consistent battery voltage means your motor will not bog so much.
       
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    4. feral

      feral Well-Known Member

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      That is correct
       
    5. simon

      simon Well-Known Member

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      Thanks Guys, You can always count on heligods.com to clear the fog of ignorance
      Simon
       
    6. Freeko

      Freeko Member

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      I think we're all here to learn from one another ;) Nothing ignorant about that, my friend.
       
    7. mr_squiggle

      mr_squiggle Well-Known Member

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      Spot on, bit It goes much deeper than that. An example is that the wiring can be much thinner and this lighter as it doesn't have to handle the high current. Another example is the electric motors are more efficient not only due to less heat, but the magnetic field is a better size & shape earlier due to the higher voltage & lower current which gives more torque.
      The list goes on & on.........


      Citizen #186
       
    8. simon

      simon Well-Known Member

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      I was hoping you would chime in, would you care to elaborate on the "the list goes on and on..." much appreciated @mr_squiggle
      Thanks again
      Simon
       
    9. smakmeharder

      smakmeharder Administrator

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      This is all so good and all so true. @simon, I used to run a hot 450 on 3s using 65C packs that cost about 40 - 80 bucks each (thunderpower 3s 65c). Yes it went well but the pack cost was horrendous. Also there was as noticeable powerloss during the later stages of the flight and my packs did not last that long.

      Since upgrading to the minip 6s, i use cheap nanotech 6s batteries that are actually lighter than the 3S equiv, it puts out power all the way to the end of the flight and my batteries last for ages. The difference is simply night and day. Once you convert you will never look back.
       
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    10. mr_squiggle

      mr_squiggle Well-Known Member

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      Here's a few more. The motors can now be wound differently to take advantage of the better mag field and produce more torque at a lighter weight (thinner wire due to lower current). Because they are lighter & more torquey they can react to governor settings quicker.
      ESC's can have lower temperature rated components inside because of the improved switching efficiency. ESC's in general can be lighter too due to lower current.
      Connectors (battery & motor) can be smaller & lighter with less arc on connection.
      The lighter weight of the heli means it automatically flies better & is more responsive (all other things being equal).
      Batteries don't need to be crazy C ratings because the current required is so much lower. Batteries will last longer as they age because the IR isn't going to hurt as much, again because the current is lower. So it now costs less to keep flying.
      That enough?
       
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    11. simon

      simon Well-Known Member

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      Thank you my knowledgeable friend
      That should sate my curious mind
      Simon
       

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