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| 450L feeling a bit loose https://www.spirit-system.com/phpBB3/viewtopic.php?f=20&t=1273 |
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| Author: | jgiannakas [ Sun 13. Mar 2016 23:27:00 ] |
| Post subject: | 450L feeling a bit loose |
I've been pushing my 450L a bit harder these days and I've noticed that when I flip the heli or give sharp cyclic moves the heli feels a bit loose, like being suspended by a spring. It just bounces a bit when I release the stick or suddenly stop the manoeuvre. Running Rail 325 blades, 55% main gain. 0 elevator filter (I have raised it to 1 and main gain to 60% but haven't test flown yet). Cyclic servos are the Align 430M. HS is at ~3000 governed. Any suggestions on what to tune? I'd just like it to be a bit more solid, like my Goblin 500 sport that stops on a dime with the Spirit. |
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| Author: | ZeXx86 [ Mon 14. Mar 2016 11:38:14 ] |
| Post subject: | Re: 450L feeling a bit loose |
Hello, the problem is very probably caused by a slower servos. Cyclic servos that are in the kit are digital, but there is not a coreless motor. It acts basically as an analog servos. By decreasing Cyclic Feed Forward it should be improved. Changing Cyclic Gain and Flight Style will help a lot. What frequency do you use for the cyclic servos? |
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| Author: | jgiannakas [ Mon 14. Mar 2016 12:16:15 ] |
| Post subject: | Re: 450L feeling a bit loose |
ZeXx86 wrote: Hello, the problem is very probably caused by a slower servos. Cyclic servos that are in the kit are digital, but there is not a coreless motor. It acts basically as an analog servos. By decreasing Cyclic Feed Forward it should be improved. Changing Cyclic Gain and Flight Style will help a lot. What frequency do you use for the cyclic servos? Hi there I'm using 150HZ. Should I increase this? Regarding the gain setting should I increase or decrease? |
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| Author: | Alyon187 [ Mon 14. Mar 2016 12:33:27 ] |
| Post subject: | Re: 450L feeling a bit loose |
Isnt 3k rpm on a 325 machine a bit on the low side? I fly my g380 at that hs and its got alot of pop but nothing crazy. Have you tried upping your head speed a bit and doing what Tomas suggested to see if you can get it any closer to the way your looking for? Also, I use those servos on my x3 and they are decent enough in my expierence. You could run them higher at 200 hz and still be fine since I believe their specs are 1520, 333. |
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| Author: | jgiannakas [ Tue 15. Mar 2016 9:24:03 ] |
| Post subject: | Re: 450L feeling a bit loose |
Ok so I've got my test banks setup- upped gain to 60&63 on the two banks from 55. Reduced cyclic feed forward by 1 and increased elevator filter to 1. Will up the headspeeds by 100 rpm just in case it helps too - don't really need more pop as its my warmup heli  Now waiting for the weekend to test fly... |
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| Author: | ZeXx86 [ Tue 15. Mar 2016 9:31:48 ] |
| Post subject: | Re: 450L feeling a bit loose |
Great, I recommend to set Elevator Filter to 2-3 in your case. This will reduce bounce-back effect. |
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