Discussions

12" Propeller on purple stock motors

Posted by John C. on July 7, 2011 at 7:25am
Hello All,I've got some extra stuff strapped to my quad, and needed a little more throttle with the 10" props to keep her up.I just switched to the 12x4.5, and it made a nice difference. Seems more stable and responsive to flight inputs.I was worried about the temps, and this is what I got with an IR thermometer2650 x 3S battery pack had an external temp of 120F850Kv brushless motors ranged from 140 - 170FDoes anyone see any problems with those temps?Definitely took a little flight time off. Going to try a parallel connection of the 2650mAh batteries, and see what happens.JC

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –
Follow

Replies

  • Mike Walker July 7, 2011 at 3:25pm
    Not an answer to your question, but don't forget to account for the emissivity of the object your are measuring. Shiny surfaces don't play nice with non contact thermal sensors, and will mess with the accuracy of your reading. I have used a piece of black tape in the past to help.
  • Developer
    Olivier ADLER July 7, 2011 at 10:44am

     

    External temp is not the right one because of propeller air flow, even if you are using an infrared thermometer to check.

     

    Internal temp can be higher, specially after motor stopping where the temperature continue to rise.

     

    So after stopping your fly, never stop your motor too fast if you are pushing them to the limit. Wait a couple minutes so that they can cold down.

     

    I've found that 12" propellers are really too big for my 2814/22 motors, at least for 4S powering where full throtle go up to 450W. This is far too high for such a motor. 300W max is a good value i think.

     

     

     

  • Moderator
    Hai Tran July 7, 2011 at 8:50am

    LoL I did the opposite.  I have the bigger brother 880KV motors and I switched to 10x4.5 props for 3 reasons.

     

    1.  they are cheaper to replace

    2.  the motors don't have to work as hard to increase RPM, which should equal faster RPM changes and therefore faster response. (in theory)

    3.  I have a hexa, so I'm already getting two extra props providing extra lift.

  • Moderator
    John Church July 7, 2011 at 7:50am

    Hi John,
    That's 20-50F over ambient temperature. We, in AZ, don't have much choice if we want to fly  :) . It sure is a double-edged sword here, weather-wise.

    Anyway, looking at some of the temperature limits for various motors online, many recommend staying under 200F. With all of the dust/sand and heat here, we have to face the fact that our batteries and motors just won't last as long. :(  But, we sure get a lot of fly days!

  • Sebastian Gralla July 7, 2011 at 7:30am
    are you saying that your motors get up to 80°C ? that's too hot, they won't do long like that (magnets may loose their magnetic force above 80°C permanently!)
This reply was deleted.

Activity

DIY Robocars via Twitter
Nvidia Jetbot + Lidar +AWS https://www.linkedin.com/posts/camilo-buscaron-93739827_using-cloud-services-to-extend-robots-activity-6788961760192929792-LLNP
3 hours ago
DIY Drones via Twitter
RT @chr1sa: After more than a year of only virtual races, @DIYRobocars returns to the newly renovated @circuitlaunch on May 22 for the resu…
Sunday
DIY Robocars via Twitter
RT @DAVGtech: And now available with LiDAR 🔥 https://twitter.com/Heavy02011/status/1381137016381964293
Sunday
DIY Robocars via Twitter
RT @Heavy02011: #VirtualRaceLeague: @DIYRobocars Race #9 - #ParkingLotNerds #thunderhillracetrack, CA Join us for the next race April 24th,…
Sunday
DIY Robocars via Twitter
RT @DWalmroth: Weather's finally cooperating, looking forward to racing 1:10 scale autonomous cars outdoors again! @diyrobocars, @NVIDIAEm…
Apr 7
DIY Robocars via Twitter
RT @AIDRI_: I finally succeeded in optimizing the trajectory and speed of a car on a #racetrack. Next step: implement a 2d controller and…
Apr 7
DIY Robocars via Twitter
@jetdillo @circuitlaunch Actually the second *in person* event in a year. We do virtual races every month
Apr 2
DIY Robocars via Twitter
Update: we're moving it back one day to Sunday (the 4th) at 11:00am instead
Apr 2
DIY Robocars via Twitter
@GrantEMoe @circuitlaunch Update: we're doing it on Sunday (4th) at 11:00am instead
Apr 2
Laurie J. Troy liked Jasper Kueppers's profile
Apr 1
DIY Robocars via Twitter
RT @chr1sa: Maybe we should have a mini @DIYRobocars race in our lower school's playground https://t.co/xLFeua1R6X
Mar 29
DIY Robocars via Twitter
If anybody wants to join us for an informal outdoors hack/race we're going to be meeting at the @CircuitLaunch park… https://twitter.com/i/web/status/1375907409223249923
Mar 27
DIY Robocars via Twitter
RT @SmallpixelCar: Ready to reopen, innovation has to continue. Inside/outside, LiDAR/GPS, race/delivery https://t.co/jpmvttoHEd
Mar 26
DIY Drones via Twitter
RT @DAVGtech: By far best race yet! Congratulations to the winner @Heavy02011 🥇🏆🍾👏👏👏 @diyrobocars @donkey_car @NVIDIAEmbedded https://t.co/…
Mar 20
DIY Robocars via Twitter
RT @Heavy02011: #VirtualRaceLeague: @DIYRobocars Race #8 - #ParkingLotNerds ⁦@DAVGtech⁩ ⁦@DWalmroth⁩ ⁦@OttawaAVGroup⁩ - join us tomorrow h…
Mar 20
DIY Drones via Twitter
RT @mrpollo: 11 years ago, the pxIMU was announced to the world on @DIYDrones, and it changed the life of many (mine included). The followi…
Mar 18
More…