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Aug 04, 2012, 06:45 AM
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Mini-HowTo

Checking the KV of your Motor Using the Castle Data Logger


This should really help get the correct prop and the correct gearing on your Heli...
I put this in quotes because I pulled this from another post I made... Thanks for reading....

" You can use the Castle data log to find the "Running KV" of the Motor ... In the native gov set the HS 3 to 4000 RPM ( this is to get the motor to run at 100% ) you can also run in fixed endpoint and make sure you are running 100% in the data log. In Set RPM Gov the IDEA is to get the motor to run Flat out... clear the Data Log...then run the Heli with blades off or pinion disengaged so you can get the motor to run at 100% un loaded... Then on the graph viewer you can download the data from the esc.... change the gearing to 1 to 1 and then in the graph scroll over and you get the vertical line that shows voltage and motor RPM at that time ( ame Mouse position ) ... divide motor RPM by Voltage and you will get the KV of the motor and you can use this in the Castle link setup instead of the rated KV as this is the information you are feeding the Castle Link for the advisement part of the program..."
Last edited by Clintstone; Sep 25, 2013 at 09:43 AM.
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Aug 06, 2012, 08:28 PM
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Try it... you may be surprised...
Aug 07, 2012, 05:45 PM
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sandyem16's Avatar
yep.. my 440 kv motor calculates to 478 kv.. With my Logo 600se and lowest gear 11t on 12s, its still over geared.. No wonder..
Aug 07, 2012, 07:51 PM
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This is a valuable setup tool...
Aug 11, 2012, 06:56 AM
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miche's Avatar
Thanks..
Aug 23, 2012, 08:54 AM
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We checked motors at IRCHA and folks were surprised to see how far off some ratings were....
Sep 06, 2012, 11:39 AM
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Quote:
Originally Posted by Clintstone
... In the native gov set the HS 3 to 4000 RPM ( this is to get the motor to run at 100% )
Is the 4000 rpm a "magic" number for all heli motors , ie do I use this set HS for all my motors with CC ESC's ?
Sep 06, 2012, 02:21 PM
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Quote:
Originally Posted by teamlotus
Is the 4000 rpm a "magic" number for all heli motors , ie do I use this set HS for all my motors with CC ESC's ?
No magic number the idea is to get the GOV to run the motor flat out at 100%. you will see the motor out put at 100%...

It is possible for a smaller Heli to have a HS of 4000 or greater so you need to make sure that the HS you enter is high enough to run at 100% you can see this in the graph so it should be easy to sort out.


The example of 4000 that I used was on a Heli GOV at 2000 HS around 95% in Set RPM mode... So this model could not get to 4000 RPM so it was running flat out at 100% ....
Last edited by Clintstone; Sep 06, 2012 at 02:26 PM.
Sep 06, 2012, 02:23 PM
A man with too many toys
Quote:
Originally Posted by teamlotus
Is the 4000 rpm a "magic" number for all heli motors , ie do I use this set HS for all my motors with CC ESC's ?
The number has to be high enough so that the motor is running at 100% full throttle. Its possible that a very small helicopter would need to have that number higher.

.
Sep 09, 2012, 02:30 PM
Registered User

How about airplane set-ups


Will this work with just a full throttle run ( no prop) using a controller in airplane mode as well? auto or fixed end points?
Sep 09, 2012, 04:08 PM
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Quote:
Originally Posted by rotomatt
Will this work with just a full throttle run ( no prop) using a controller in airplane mode as well? auto or fixed end points?
Just plot the Power Out parameter too. It should be 100% at WOT. If it is, then yes you can calculate Kv with the method.
Jan 07, 2014, 03:34 PM
Registered User
Good info! . I made the test with my new Align 730mx "850"kv , and a big surprice!!

Real kv -> 886kv

Good for governor setting!!

Can I use this parameter with safe in my SET RPM ?
Jan 08, 2014, 04:40 AM
A man with too many toys
Yes that’s the real number. The advertised number is just rounded off to look nice.
Jan 08, 2014, 04:56 PM
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Clintstone's Avatar
Quote:
Originally Posted by Marcos Sallua
Good info! . I made the test with my new Align 730mx "850"kv , and a big surprice!!

Real kv -> 886kv

Good for governor setting!!

Can I use this parameter with safe in my SET RPM ?
That is what I recommend... this number can change some with timing but if you are testing with the setting you plan to run... then plug this number into the SET RPM KV Setting for the motor... This part is advisory to help get the best setup for your specific model and power system.
Jan 08, 2014, 08:20 PM
Registered User
Thank you. the setup of the Governor SET RPM is correct in this moment

Now, Some time ago I found this video of Curtis Youngblood , he recommend change the lipo voltage to "Custom" and select 3.90 because the value is better average

What do you think about this ?




You can find this advice in 6:35 of the video

http://www.youtube.com/watch?feature...&v=SDeCpckM9w8


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