X8 Carbon with total weight 4kg

Posted by opiq on November 5, 2014 at 6:31pm

Hi Guys,

I had first maiden with my X8 carbon yesterday. This is my spec:

800 kV motor, max 1250 watt

13x6.5 propeller

2x 4S 5000mAH 25C

Castle 80A ESC

Total weight 4kg

my X8 failed to take off... could someone help me to give advice about my spec, which part should be replaced or else?

Thanks in advance,

tq

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Replies

  • JeffBetts_KK4MTC November 6, 2014 at 6:47am

    I don't think power is the problem, but you could do some damage to your motor with that large of a prop and 6S. I use a surgical tubing and paracord 'hi-start' launch to help get mine up to speed and up to 10-12 meters in altitude before starting my motor. Hand launching is dangerous (I got 14 stitches) and won't create enough speed to create the lift necessary to support that much weight. Your CG looks very close to where mine is.

  • opiq November 6, 2014 at 5:24am

    Today, I change the propeller to 16x8 and battery to 6C 5000 mAh....but, X8 still failed to take off :(

    It was fly about 5 meters then fall.

    • Tommy Larsen > opiq November 6, 2014 at 6:05am

      6C 5000mah is to weak. That will just deliver max 30 amp. My X8 took off at around 70 amp

    • iskess > Tommy Larsen November 6, 2014 at 8:39am
      @Tommy,
      I'm pretty sure he means 6S not 6C.
    • JeffBetts_KK4MTC > Tommy Larsen November 6, 2014 at 6:51am

      I fly 4S 6600mah (2x3300) and with 12x10 prop pull around 45amp at WOT. Plenty of power, but won't climb vertical, which is ok with me.

    • opiq > JeffBetts_KK4MTC November 6, 2014 at 2:20pm

      Jeff, how much weight your X8 ?

    • opiq > Tommy Larsen November 6, 2014 at 6:33am

      Which battery you use for your X8?

    • Tommy Larsen > opiq November 6, 2014 at 6:40am

      http://www.maxamps.com/Lipo-11000-148-Pack.htm

  • JeffBetts_KK4MTC November 5, 2014 at 6:46pm
    How did you attempt to launch it? Bungee hi-start or hand toss? Where was your CG? What happened when it was released? Nose dive, roll, etc.
    • opiq > JeffBetts_KK4MTC November 5, 2014 at 7:06pm

      I did hand toss. It seems not enough thrust to go up even in full throttle, so it just dropped. Attached picture where the CG was.

      Thx

      X8_CG.jpg

This reply was deleted.