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OK PROP pro's 8,9,10 pros cons?

Discussion in 'General Discussion' started by Capodrone, May 12, 2013.

  1. Capodrone

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    trying to wrap my head around my prop buying addiction.. LOL

    Seems lately im buying props just to have them . all sizes...

    if prop length is increased generally what will that change flight wise?

    bigger props more stability more lift less speed?

    thanks :?: :ugeek:
     
  2. Audaciter

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    yes, exactly. Smoother flight too, don't react as suddenly to speed changes, or flight direction.

    They are probably harder on your motor though. Although multi rotors in general are very hard on bearings, and the
    more weight you add the higher your maintenance costs will be.
     
  3. Sac D

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    10 inch props won't fit on the Phantom. They will hit each other, and the shell.
     
  4. tanasit

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    In general for the Phantom, the 8" will fly best but there are a couple reasons why 9" ones will be chosen.
    1. More lift for heavier Phantom.
    2. More lift for people who fly in high altitude thus thin air, say 1000 or more meters above sea level.

    Also the more rigid prop like the carbon fiber will give you true pitch so it is more sensitive to stick control than the flexible plastic ones.
    If the motor is strong enough, the larger the prop with less pitch will be more efficient than the smaller prop with more pitch. Another words, many air plain flyers opt for the gear motor to spin as large as possible props so that they get better climb rate, longer flight time and less heat on the motor.
     
  5. Capodrone

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    thank you for the information, very useful......

    Im learning the hard way that just because the prop is 8x4.5 that does not mean it will fit motor shaft....

    unfortunatly i have an addicition to ebay and purchased three seperate sets of props that were 8x4.5 in multiple colors, without realizing the dji phantom shafts are apparently a specific beast ...


    oh well.....

    oh and thanks sac d - your information saved me another $63 worth of props that wont fit.... :lol:
     
  6. tanasit

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    If you use the prop reamer to enlarge the hole to 8 mm, then any prop (8 to 9") will fit.
    You don't have to use the props with "key" exactly like DJI stock.
    However, you may run into a problem if the hub is too thin (short), so even if you turn the prop nut all the way down the prop may still loose. You will then have to use the washer (5/16" works fine), under the props.
     
  7. jpz

    jpz

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  8. tanasit

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    They use the name Phantom on the title so that when someone search for Phantom prop, they will come up and give them more chance to sell because that Phantom owner may also have the other multi-rotor that can use that props.
    That 10" won't fit on our Phantom.

    As for the props with the round hole in the hub need no special method to lock on because they are being used everywhere. As long as the high of the hub is "above" the shoulder of the 8 mm bottom part of the motor shaft, once you turn down the nut it will lock the prop in place. However, if you want to be sure and being nervous about the prop turning loose, you can always add the lock washers on the top between the prop and the nut. The one that works well can be seen below:

    [​IMG]
     
  9. jpz

    jpz

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    thank you for the Info, I'll buy some of those wahsers ;)