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Thread: Featherweight build

  1. #11
    Hi, found some 24v 30w DC motors, would these be competitive enough for a FW drive (one to each axle - 2no. axles)?

  2. #12
    Member

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    Nat
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    Wanna Choppa (Axe FW) Short Circuit (HW RWs6) Locking Wheel Nuts (AW) DELLapidated bANTtery (AW) Lo
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    potentially, but what is their weight and you will also need to consider the gearing.
    The google search i did shows they are a bit larger than normal drive motors, but this is not specifically your 24v 30w motors

  3. #13
    They run at stated '24v @ 6000rpm full speed', I was going to run them on 12v (3000rpm potential) with direct drive to the wheel (130mm dia). The acceleration can be set on the handset. If it comes to it I have room for a gearbox. Going for 24v so I can upgrade later if I feel it necessary
    Any thoughts???

  4. #14
    Ocracoke's Avatar
    Team Kaizen

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    Michael
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    I would seriously recommend a gearbox (even a simple single stage reduction) to make the machine more drivable - typically planetary gearboxes are used in the FW class. Have a read through the build diaries here to see what folks are using.
    Team Kaizen

    AW: Osu, Ikari, Ramu
    BW: Shu! (Build Thread)
    FW: The Honey Badger (Build Thread)
    MW: Kaizen (Build Thread)

  5. #15
    Thanks Michael, what output shaft speed would you recommend? There are some 75w 12v & 24v motors with reduction gearboxes, giving very high torque, but the output shaft rpm is only 470. Feels a little slow, again any thoughts?

  6. #16
    Ocracoke's Avatar
    Team Kaizen

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    That is a little low but can be compensated for with slightly bigger wheels. The Honey Badger 3 ran both 4S (13.2v nominal) and 6S (19.8v nominal) LiFe batteries at Grantham and both were suitably nippy (4S was more controllable on the floor though ).

    The motors I use come up to about 1000rpm with no load on 4S and is definitely on the fast end of what FW's have but 470rpm output on 4 or 5 inch wheels should be perfectly respectable.
    Team Kaizen

    AW: Osu, Ikari, Ramu
    BW: Shu! (Build Thread)
    FW: The Honey Badger (Build Thread)
    MW: Kaizen (Build Thread)

  7. #17
    I agree, 470 rpm on 130mm dia wheels should only give a theoretical speed of 11.3km/hr. I'm guessing I should be aiming for around 15 to 20km/hr. Remembering of course traction has to be gained at the point of acceleration. Shall look for reduction gearbox....

  8. #18
    Are any of the propderives from hobbyking worth looking into? What would be a good suitable ESC for it?

  9. #19
    Yes, propdrives can be a good motor for a feather, and we have decent results with a SimonK flashed Turnigy TZ85

  10. #20
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    I've had great results out of propdrives 50-60 270KV on 6:1 using 100mm wheels. You could use a smaller propdrive and still have a great robot. I had 2 50-60 in a 4 wheel drive bot -hilarious to drive

    TZ85a are great therefore they are discontinued

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