What does this prop combination mean ?

Posted by Damo on September 14, 2014 at 6:43am

I am having issues with my quadcopter in that it is taking about 70% throttle to hover. it was working fine before on the same weight but different motors and props. After replacing almost all components over the past two months (as i did not know the root cause), I believe the issue may be new motors and props i bought. I bought these motors and these props. Now the motor spec recommends 12X45 as opposed to the 11X50 i bought. Does this explain the significant power loss i am experiencing ?

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  • This reply was deleted.
    • Damo September 15, 2014 at 1:23pm

      i am having trouble finding 

      12x4.5 Carbon Fiber Propellers with a 4mm adaptor in the uk if anyone has a link, that would be great.

    • Felixrising > Damo September 15, 2014 at 2:45pm

      Not specifically the UK.... http://flyduino.net/propeller-carbon-fibre-glass  The Gemfan AP props are my favourites, but the HQ are good and Tiger are the bomb (if you an afford it).

  • MR60
    Hugues September 14, 2014 at 11:44pm

    Hi,

    You have practically no differences between your old and new setup,  so you should not experience any throttle difference except if you also changed other things like fc, ESC, battery,...?

    I would not fly anyway with these motors and the 12x45 props, in a 4S config, as you motors will overheat.

    Your issue has probably more to do with your APM parameters throttle config or radio calibration (not using the full PWM range)

    Side note: yes you will get more thrust with higher pitches but you will consume more amps (loose flight time and motors heating more); the optimum ration is pitch=1/3 of prop diameter.

    • Damo > Hugues September 15, 2014 at 12:40pm

      so - i haven't changed anything except made it lighter. it must be the props causing the issue?

  • This reply was deleted.
    • Damo September 14, 2014 at 1:26pm

      yes , i will certainly compare the two. thanks

    • Felixrising > Damo September 14, 2014 at 4:40pm

      Rob has the right idea..  definitely try the 12x45... worth noting, those graupner style props in high pitch are not well suited to hovering, they are better in fast forward flight such as acrobatic manoeuvres, but you will find for hovering, that lower pitch props are more efficient and 'grip' more..   if you take a look at the way T-Motor is going with their props, they are decreasing pitch rather than increasing, to optimise lift efficiency.

  • Felixrising September 14, 2014 at 6:48am

    Can you provide some more information about your setup? Take off weight (with battery), battery type and size. What was the previous motor/prop combination you had on this craft. 

    Can you outline what troubleshooting steps you have performed? Such as ESC calibration, radio calibration, etc?

    • Damo > Felixrising September 14, 2014 at 1:32pm

      Hi Felix, i have resinstalled and calibrated everything from scratch. I also replaced ESC's, batteries, frame.

      Old setup: Props 11X47 Motors AC2836-358, 880Kv

      New setup: Props 11X50 Motors 880Kv Motor AC2836-358

      Note the weblink identified above for the motors in my question recommends 12X45.

      The quad weight is 5 pounds.

This reply was deleted.