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  1. #1

    Join Date
    Aug 2017
    Location
    Sandy Eggo, CA
    Posts
    151

    Matching props to motor?

    Anyone know of a tool to size props to motors? I'm trying to find something that I can use that will allow me to take and input say, 1200kv, 3s/25c battery, and have it spit out what size prop I need for

    I've gotten stuck on the Power Packs and like them, but I also have some motors that I picked up at an R/C swap meet. I'd like to utilize them if I can, especially since I see the packs going in and out of stock fairly quickly; I know that there are certain efficiencies with certain props, I just don't know how to figure out which prop with which battery with which kv output motor, if that makes sense.
    Hangar:

    Blade Conspiracy 220, Inductrix Pro, Blade Glimpse, FT Sea Duck, FT Duster, FT MiG-3

    Workbench:

    Possible Crimson Skies plane? We'll see!!

  2. #2

    Join Date
    Nov 2016
    Location
    Germany
    Posts
    793
    I know and use this pages
    https://www.ecalc.ch/motorcalc.php

  3. #3
    Skill Collector rockyboy's Avatar
    Join Date
    May 2015
    Location
    Alexandria, VA USA
    Posts
    3,143
    I'm also a frequent buyer of swap meet motors.

    My approach is to do a google image search of the motor name and number and look for charts that show the power requirements with different props. This has worked for me with at least a dozen motors, and only failed me two or three times. And that was what prompted me to build a test stand and buy a watt/amp meter.
    I want YOU to join us in the 2018 Flite Test Forum WWII Design/Build Challenge!

    My hanger listing, build threads, conversion projects, and Taranis radio mods are Over Here....

  4. #4

    Join Date
    Aug 2017
    Location
    Sandy Eggo, CA
    Posts
    151
    Quote Originally Posted by rockyboy View Post
    I'm also a frequent buyer of swap meet motors.

    My approach is to do a google image search of the motor name and number and look for charts that show the power requirements with different props. This has worked for me with at least a dozen motors, and only failed me two or three times. And that was what prompted me to build a test stand and buy a watt/amp meter.
    The test stand/watt/amp meter sounds like something that would benefit both me and my father...he's trying to find a combination for his Mister Mulligan and a little park flyer that he had to replace the motor on (he bought it complete at a swap meet; the ESC went belly up, and he figured he could just replace it and have it working - turns out it's hard to find a brushed ESC that will work with the requirements of the motor).

    Any suggestions on a particular watt/amp meter that I should look at?
    Hangar:

    Blade Conspiracy 220, Inductrix Pro, Blade Glimpse, FT Sea Duck, FT Duster, FT MiG-3

    Workbench:

    Possible Crimson Skies plane? We'll see!!

  5. #5
    Skill Collector rockyboy's Avatar
    Join Date
    May 2015
    Location
    Alexandria, VA USA
    Posts
    3,143
    I have the El Cheapo turnigy one from hobby King but the best one I hear about is the Watts Up
    I want YOU to join us in the 2018 Flite Test Forum WWII Design/Build Challenge!

    My hanger listing, build threads, conversion projects, and Taranis radio mods are Over Here....

  6. #6
    ViperTech's Avatar
    Join Date
    Nov 2013
    Location
    Dover PA
    Posts
    790
    Quote Originally Posted by sprzout View Post
    The test stand/watt/amp meter sounds like something that would benefit both me and my father...he's trying to find a combination for his Mister Mulligan and a little park flyer that he had to replace the motor on (he bought it complete at a swap meet; the ESC went belly up, and he figured he could just replace it and have it working - turns out it's hard to find a brushed ESC that will work with the requirements of the motor.

    Do you know the manufacturer of the Mister Mulligan? I found a great planes model that has a 52" wingspan and it calls for a 42-50-800kV motor and a 12x8E prop on a 45 amp esc and a 4s battery.

    What size is the park flier? I look around to find comparable size planes to get a sense of the motor and prop size needed.

    Might just want to go brushless on the park flier.
    Failure is the road to success!

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