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Thread: New molded Ritewing Zephyr II

  1. #961
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    Quote Originally Posted by Infernal Bill View Post
    Stayed inverted for about 20 seconds and then both batteries fell out of the plane at about 150 feet up. Yup. That happened. My spotter saw them come down while I watched my lifeless Zephyr drift to the ground. Luckily, without the batteries, she's relatively light and just kind of fluttered down. Ended up without a scratch. Found the batteries and learned a lesson:
    DUDE!! I just did that with my TL50 yesterday at like 85mph. . . went to go get the wing and NOTHING was damaged!! I couldn't believe it and checked everything like 3 times I put a latch on my batt lid and now I can pick the wing up by the lid

    Heres a link if you wanna check it out:
    http://www.youtube.com/watch?v=wdg2_...1&feature=plcp
    Never did find my Batts though
    Last edited by Danub; 14th January 2012 at 11:30 PM.

  2. #962
    Navigator Freshmint's Avatar
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    Quote Originally Posted by Infernal Bill View Post
    So here's a quick 5 minute video of some of the highlights. Avoided other planes at the field. Avoided a bird. Low fly-bys. Motor off gliding. Loops and rolls. Inverted flight. And yes, luckiest crash I ever had. Enjoy.


    the 3s 5000 with the xt60? their hard to pull apart!

  3. #963
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    ecalc warnings

    Looking for some advice from the engineers/gearheads --- which ecalc warnings should I be concerned about? Seems A30-10L is the best all around, but on two 4S 330mah in parallel with a 70a esc, everything generates warnings... I like the 10x7 (full of warnings), but 10x5 is the only one with enough static thrust.

    They ALL generate "* The Motor Voltage is close to the Limit*" warnings ... willing to spend more on a motor, but don't know what to look for... I want to at least know why I'm buying the motor I end up with ...

    Infernal Bill: which did you chose, and are your numbers matching up?

    Quote Originally Posted by Infernal Bill View Post
    Funny you should mention that as I was just playing around with ecalc and now have 12 printed out sheets in front of me. I'm trying out different combinations of motors (Hacker A30-10l versus Turnigy D3542/4 (1450) versus old red and blue Turnigy 3648-1450), 10x5 prop verus 9x6 prop and 3 cell versus 4 cell. All seem to at least be close to each motor's capabilities but here is what I'm finding with regard to thrust and efficiency:

    Hacker: 4 cell on a 10x5 gets 2900 grams of thrust (pulling 57 amps) and 3 cell gets 1800 grams (34 amps)
    Hacker: 4 cell on a 9x6 gets about 2700 grams of thrust (pulling 49 amps) and 3 cell gets 1700 grams (30 amps)

    Turnigy D3542/4: 4 cell on a 10x5 gets 3700 grams of thrust (but appears to pull about 90 amps) and 3 cell gets 2400 grams (pulling 59 amps)
    Turnigy D3542/4: 4 cell on a 9x6 gets about 3500 grams of thrust (pulling 78 amps) and 3 cell gets 2300 grams (pulling 50 amps)

    Blue and Red Turnigy: 4 cell on a 10x5 gets 4100 grams of thrust (pulling 96 amps) and 3 cell gets 2700 grams (pulling 64 amps)
    Blue and Red Turnigy: 4 cell on a 9x6 gets about 3800 grams of thrust (pulling 82 amps) and 3 cell gets 2400 grams (pulling 53 amps)

  4. #964
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    Well most people are not running wide open throttle , plus with the airflow this motor gets its cooled so well its never really an issue, vent the esc well .
    Its not unheard of to go with 60 or 70 amp esc , the 10/6 on 4s is plenty.
    Calculating sometimes is not always a good thing , a 10/7 is starting to get a tad high on pitch for 4s and efficiency.
    The motor was originally rated to hang a 3 d modle on a prop, the ZII wings fly very litely loaded compared to a 3 d model hanging on the prop.
    The hacker motors are way underated when it comes to the load max ratings.

  5. #965
    I've never seen the Hacker do more than 50A on a 10x7, 4 cell setup. take these ecalc values with a grain of salt and lots of ketchup.

  6. #966
    LET'S GET PISSED! Pooch's Avatar
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    What kind of time can you run these things at WOT on that kind of setup (A30-10L, 4S, 10x6 etc.) generally? I've been going pretty easy on mine so far and not giving it more than 10s or so of the full beans.

  7. #967
    I can run through a whole battery WOT without hurting the motor. in flight, obviously, ground tests are not very healthy to begin with.

  8. #968
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    That's what I needed to hear ... thanks.

  9. #969
    Yeah, I was getting bogged down in the theory. Have been flying it with a 10x5 prop and getting ok speed but excellent thrust. Flight time for mixed flying (cruising around mixed with some high speed passes mixed with some aerobatics) is getting me about 30 to 35 minutes bringing no cell lower than 3.7 volts at rest. On the 3cell setup I'm getting 40 to 45 minutes. The efficiency is kind of blowing me away. I think I might try a 9x6 tomorrow.

    In the end trial and error on the field is a lot more informative and fun than ecalc.

  10. #970
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    Quote Originally Posted by Trappy View Post
    I can run through a whole battery WOT without hurting the motor. in flight, obviously, ground tests are not very healthy to begin with.
    No doubt, I can Roll a HARD flight on 4s with My Zeph in 90deg F southern Ca. heat and ALL is good. Everything is cool on landing
    @Bill-if you got it you might wanna try a 9x7. . . They are a little low on thrust so make sure you give her a good throw

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