Dangerous divergence: FIXED and understood

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Re: Dangerous divergence: FIXED and understood

Postby afernan » Sun Apr 28, 2013 7:19 pm

@Larry:

sure, since I was using high mix-tilt% (100%) combined with still high TILT_RATE_D = 6000 . With this values It´s really hard to be perturbated by the wind gusts. It´s a pleasure to see fighting against the pushing wind in a PH. Also, doing a hand test it´s incredibly hard to get a rotation.
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Re: Dangerous divergence: FIXED and understood

Postby afernan » Sun Apr 28, 2013 7:29 pm

Note: I want to comment that the combination I´ve presented before:

RC-Timer HP4215 (460kV) with carbon 12x4.5 prop: is a BAD combination

I´ve notice it looking at the MOTOR logs that worked very close (or overpassed) the max level (1950pwm) while hovering. This motors has so low kv that needs at minimum 15x4.5 propeller to work in the best range and also decrease the hovering pwm at about 1400-1500.

A good combination for large propellers is the RC-Timer 5010 & carbon 15x5.5 propeller
A good combination for 12x4x5 propeller is T-Motor 2216

Angel
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Re: Dangerous divergence: FIXED and understood

Postby LPR » Sun Apr 28, 2013 10:44 pm

Angel

I sounds like your using a 3s lipo with your quad. A four 4s battery should reduce or eliminate the problem of needing high motor signal PWMs in hover. Someone said that if the throttle factor is set too low that you get attitude control problems.

Larry
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Re: Dangerous divergence: FIXED and understood

Postby afernan » Mon Apr 29, 2013 11:00 am

@Larry.

Yes, you´re right: when I saw the problem I was using 3S battery. Anyway, that motor/prop combination wasn´t good (low kv with small propeller) since motor is not working in the best design point (low rpm).

Angel
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Re: Dangerous divergence: FIXED and understood

Postby LPR » Mon Apr 29, 2013 8:47 pm

Angel

KV is RPM per volt. Your motors would work well for a 12" prop if you used a 5s battery.


Larry
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Re: Dangerous divergence: FIXED and understood

Postby teramax » Mon Apr 29, 2013 11:23 pm

LPR wrote:Angel

KV is RPM per volt. Your motors would work well for a 12" prop if you used a 5s battery.


Larry


I found out, AutoQuad is working best for me when rig hovers at 65-75% power.
somehow everything can fly
http://www.youtube.com/user/ter4m4x
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Re: Dangerous divergence: FIXED and understood

Postby afernan » Thu May 02, 2013 10:02 am

@Teramax: that motor/prop combination works well using 3s or 4s. The problem is that they can induce or amplify this problem of saturation of some varibles in AQ, that at the end are the reason of the divergence. So, for AQ is better to choose a combination more equilibrated.

Angel
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Re: Dangerous divergence: FIXED and understood

Postby Simson » Mon Aug 31, 2015 9:07 am

Is this still a issue with the actual firmwares?
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Re: Dangerous divergence: FIXED and understood

Postby afernan » Mon Sep 07, 2015 7:19 am

Not. It´s solved long time ago

Angel
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