[SOLVED] First Flight - My F450 can't lift of the ground - ArduCopter User Group

Replies

- Thomas > Gary McCray March 2, 2014 at 10:44am
  
  Hi Gary,
  
  Now i'm really confused, i'm looking at my props and can't see if they are wrong or they not... I take the pictures, can You look at them?
  
  On two of them are printed 10x38R that mean pushers right? I mounted them on CW arms, second 2 of them has only printed 10x38 without the R so they are normal and i mounted them on CCW arms... As You know they are cuted inside the hole to fit the DJI motors so i can't turn them around becouse they will not fit into the shaft... Or i'm missing something?
- Thomas > Thomas March 2, 2014 at 10:56am
  
  Here are the picture of one of the proppeler and the hole, on one side that is printed 10x38R the hole is cutted and other side is not and it not fit on the shaft... Maybe i need use the force? i Mean the hard way? Confused...If i fit them with force i'm worry that they break in flight... What the hell is wrong with this... But they look upside down now to me...
- Gary McCray > Thomas March 2, 2014 at 11:22am
  
  OK Thomas, two things wrong.
  
  A you really do have the wrong props in a very serious way.
  
  First off you have DJI pusher props both CW and CCW
  
  This only makes a difference with the props that are custom broached for the DJI motors as (you are right they will only correctly fit on one way.)
  
  Because of this custom tapered oval hub broaching, DJI is one of the only companies to have both CW and CCW tractor and CW and CCW pusher props.
  
  You need the "tractor" or "puller" style of both.
  
  You need 2 each CCW and 2 each CW puller or (tractor) props.
  
  And for DJI props at least for these motors those should be labled 1045 as 4.5 is actually the correct pitch for this motor on this copter.
  
  In any case you have them correctly installed as far as the motor is concerned, but incorrect as far as your copter is concerned because those are pusher not puller props.
  
  However 3.5 is not enough pitch anyway.
  
  If you are going to use DJI props you need 2 DJI 1045's and 2 DJI 1045R's.
  
  Until seeing your props I didn't even know DJI made a pusher prop for these motors.
  
  If they are easy for you to get the 10" x 4.7 pitch GemFan DJI hub compatible carbon filled prop is also an excellent prop for this copter.
  
  Basically, for your copter, the props are definitely upside down, but rather than bore them out to fit, you really should just get new props because the pitch is inadequate anyway.
  
  On a multicopter if the cast in printing on the prop isn't on top, the props are in fact upside down.
  
  Your copter is flying in ground effect at full throttle barely above the ground and that is just what you would expect from upside down props.
  
  I am absolutely positive that if you get the correct props and install them properly your little copter will fly like a rocket.
  
  Best Regards,
  
  Gary
- Thomas > Gary McCray March 2, 2014 at 11:39am
  
  Well, English is not my natvie language so don't understand everything.. But this props comes with the KIT, i read on RCgroups i think that 10x38 are stronger than 10x45 and better.. But i have no knowledge is this true.. The tru is that i buy ARF kit original DJI and that props was inside the box together with that 8"... Only thing now is that the tapered oval is on the letter side and on the other is only a circle so to put them on DJI motors i will have to push them hardly... Do not know waht is wrong. China guy made tapered oval on wrong side? The 8" also have the tapered oval on the same letter side... Here are the info that 10x38 are for F450 and they are new one... http://www.buildyourowndrone.co.uk/DJI-Flame-Wheel-1038-Propellers-...
- Thomas > Thomas March 2, 2014 at 11:56am
  
  I found the picture of this props They also have this oval on the printed side and on the movie i linked above on the end they also have oval on printed side...
  
  So i have to push them or china guy not made the oval thru all the hole?
- Bo Wingo > Gary McCray March 2, 2014 at 11:26am
  
  Wow. Good catch, Gary. I never knew DJI made things so complicated. ;)
- Bo Wingo > Thomas March 2, 2014 at 11:09am
  
  Your second photo is the correct orientation with the lettering on the top side of the propeller.
- Thomas > Bo Wingo March 2, 2014 at 11:14am
  
  Yes but on this side with letters the hole is cutted so to fit on the DJI motor shaft i have to mount it upside down :( Do i have to pushing it? They just won't fit with letters up....
hotelzululima March 2, 2014 at 8:21am

Hi thomas,

            As per this RCGroups article(http://www.rcgroups.com/forums/showthread.php?t=1624068) ,

      can you try on 8" props and lift off?? also check that thread and doublecheck your channel connections from the receiver to the APM. Make sure they are setup correctly. Make sure the APM Idea of how the props are installed and direction matches reality.

      HZL
- Thomas > hotelzululima March 2, 2014 at 9:12am
  
  Hi HZL,
  
  I will try 8" tommorow. I double check connection from ESC to APM and from reciver and everything look ok according to arducopter wiki... Also the directions seems to be ok.

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