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| Gear ratio https://www.spirit-system.com/phpBB3/viewtopic.php?f=20&t=1089 |
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| Author: | btheli [ Fri 11. Dec 2015 4:19:12 ] |
| Post subject: | Gear ratio |
I'm giving 1.3.2 another try on my Gaui X3. The main gear has 131T and I have a 10T pinion, so the gear ratio is 13.1. The software will only go as high as 12.7. What should I do? |
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| Author: | ZeXx86 [ Fri 11. Dec 2015 8:37:22 ] |
| Post subject: | Re: Gear ratio |
The best way is to use 11T pinion, because gear ratio is very high and power system can be inefficient. There is also way to set sensor divider differently, but I have to know what is your value. |
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| Author: | btheli [ Fri 11. Dec 2015 13:26:43 ] |
| Post subject: | Re: Gear ratio |
10p motor so sensor divider is 5. Sent from my phone using Tapatalk |
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| Author: | ZeXx86 [ Fri 11. Dec 2015 15:08:25 ] |
| Post subject: | Re: Gear ratio |
You can set Sensor divider to 6 Gear Ratio to 10,9 Then the result should be same as with 5 and 13.1. The values are used only for RPM calculation, both are multiplied. 6 * 10,9 = 65,4 5 * 13,1 = 65,5 The difference could be max. 4 RPM which is under resolution of the sensor. |
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| Author: | elfew [ Fri 11. Dec 2015 15:09:41 ] |
| Post subject: | Re: Gear ratio |
Ok, anyway this is a little bit tricky way. It should be supported by spirit itself without this recalculation |
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| Author: | ZeXx86 [ Fri 11. Dec 2015 15:22:08 ] |
| Post subject: | Re: Gear ratio |
Gear Ratio higher than 12 is very atypic and shouldn't be used from our point of view. Same limit is also in other FBL systems, for example V-Bar. We will check what is the best solution for this issue. |
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| Author: | btheli [ Fri 11. Dec 2015 15:32:04 ] |
| Post subject: | Re: Gear ratio |
Thanks. I'm in this situation because I picked up a fairly high kv motor (1860) for my Gaui X3, which is well-suited for running higher head speeds. The heli is very snappy indeed, but my flight times also dropped significantly. I may replace the motor with a lower kv, but I thought I would first see how it ran with a 10T pinion instead of the 11T. Thanks again for your help. |
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| Author: | elfew [ Fri 11. Dec 2015 23:25:46 ] |
| Post subject: | Re: Gear ratio |
Zexx, I agree of course, but the way you wrote seems to me really "hacky". I just recommend to leave this on users choise...it is their fly style and it is only up to them which gear ratio use |
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| Author: | elfew [ Fri 11. Dec 2015 23:34:02 ] |
| Post subject: | Re: Gear ratio |
Anyway I understand that this limit can avoid problems with spirit governor in some circumstances. I like the way in CC esc. There is a recommended setting displayed for the set gear ratio. Maybe something like icon with different colors in spirit setting tab next to the rpm would be nice. Red color - gov out of range Yellow - at the edge or something like this Green - within range, gov should work correctly |
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