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Old 05-16-2021, 01:52 PM   #1 (permalink)
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Default stick rate vs. servo travel

I am using an iX12 in combination with an FC6250HX with KST X20-2208 Servos in a Kraken 580 which basically works fine and flies well.

However I notice that all servos reach max. travel (either way) at a stick rate around about 40%. Collective Pitch however works O.K. so the swashplace travels along from -100 to 100 on the stick.
All iX12 settings for Elevator, Aileron and Rudder are completely untouched.

What am I missing here ? I do not seem to get the servos to reach their max. travel at 100% stick rate.
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Old 05-18-2021, 07:54 PM   #2 (permalink)
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are you going through the afr setting and setting 12degrees for roll and pitch?
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Old 05-20-2021, 01:17 PM   #3 (permalink)
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Default stick rate vs. servo travel

I have exactly the same with both of my FC6250HX fbl with a DX6G3.

One is a Kraken 580 with X15Ė1208 cyclic servos. The other one is a Fusion 360, also with KST servos: DS215MG.

When I change the dual/rate to 40%, thatís when the cyclic servos follow the exact stick movements all the way. However when I run in between 85% and 100%, the servos reach their maximum before I even move the sticks halfway. I fly without any expo and Iím used to a sensitive stick so it doesnít really bother me.

I guess I never gave it much thought. Is this different on other fbl? I guess youíll then have to move your sticks fully to get the full potential. I guess itís a different way of flying that Iím not used to.


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Last edited by Fusion; 05-20-2021 at 10:36 PM..
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Old 05-21-2021, 10:40 PM   #4 (permalink)
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Quote:
Originally Posted by Fusion View Post
I have exactly the same with both of my FC6250HX fbl with a DX6G3.

One is a Kraken 580 with X15Ė1208 cyclic servos. The other one is a Fusion 360, also with KST servos: DS215MG.

When I change the dual/rate to 40%, thatís when the cyclic servos follow the exact stick movements all the way. However when I run in between 85% and 100%, the servos reach their maximum before I even move the sticks halfway. I fly without any expo and Iím used to a sensitive stick so it doesnít really bother me.

I guess I never gave it much thought. Is this different on other fbl? I guess youíll then have to move your sticks fully to get the full potential. I guess itís a different way of flying that Iím not used to.


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are you going through the afr setting and setting 12degrees for roll and pitch?
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Old 05-22-2021, 03:48 AM   #5 (permalink)
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Quote:
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are you going through the afr setting and setting 12degrees for roll and pitch?
I followed the instructions in the 6250 manual - so Roll/Pitch is +/-12,5 degrees at max. Same for the collective.
The thing is that it's already at full when the Roll/Pitch is at 40% stick rate.
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Old 05-24-2021, 06:29 AM   #6 (permalink)
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Yes on both helis for both cyclic and collective.


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Old 05-24-2021, 06:40 AM   #7 (permalink)
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Are you seeing this on the bench and not in setup mode?

With FBL units there is not a direct connection between the transmitter and servo. For that you would need a receiver that exactly matches the transmitter.

Most cyclic servos work on a 1500uS pulse width for its centre. It will then go full cycle with a pulse width from 1000uS or 1mS to 2mS.

On the bench you are requesting a movement but as the FBL unit doesn't see any correlation between what it has output and gyro response it continues to give output to the servos until it has reached the end of travel.
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