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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › JR 9x2 and CSM SL420 micro gyro
07-17-2006 03:03 PM  14 years ago
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deiniolpook

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West Wales, UK

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JR 9x2 and CSM SL420 micro gyro
Recently purchased a 9x2 and I have a quick question regarding use with the above gyro.

I decided to use the GYRO SENS page to set the gain values which are then selected via the rudder d/r switch (manual mode)

No matter what I did with the values the gyro's performance was VERY poor, I then plugged the gyro's gain lead into the gear channel and set the gain values via the ATV and it performed correctly.
So why this problem when the gyro is plugged into AUX_2 and GYRO SENS is used??
What did I do wrong?
I don't want to leave the gyro plugged into the gear channel if I can help it as I want the gear channel for a governor.
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07-17-2006 03:41 PM  14 years ago
Colin Mill

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England

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Hi deiniolpook

The way the GYRO SENS works on the JR Txs means that there is one percentage range running from 0% to 100% that covers the full normal pulse range of the radio. Any percentage below 50% puts the gyro into Heading Lock mode and the nearer to 0% you go the higher the gain in that mode. Percentages above 50% put the gyro into 'conventional' mode with the gain increasing as the percentage rises towards 100%.

The problem with the GYRO SENS system is that it does not allow the equivalent of more than 100% ATV to be used while the gear channel allows you to use up to 150% ATV to be used if needed.

Having said that, if you are running much more than 100% gain you will probably benefit from increasing the 'mechanical' gain of the tail system (that means - listing the most powerful first - longer tail blades, more rpm, a longer servo arm, wider tail blades)

I hope that helps!

Best regards

Colin (CSM)
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07-17-2006 08:02 PM  14 years ago
deiniolpook

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West Wales, UK

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Hi Colin

Thanks for the reply.

So is it fair to say that the GYRO SENS function on the 9x is not really suitable for your gyros?
I have however now worked out that the gyro gain could be done through the AUX2 switch. This switch is a three position switch so you could have heading hold in one position rate in another and centre would then technically be gyro off (0%)
This then leaves the gear channel for the governor.
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07-17-2006 09:52 PM  14 years ago
Colin Mill

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England

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Hi deiniolpook

The GYRO SENS is OK with our gyros in most cases because the maximum gain it allows is enough to reach the point of instability. We use the GYRO SENS for the gyro in several of our models. However, we also have setups where the gear channel is used for the gyro and the GYRO SENS facility is used for the governor! In RevLock we have arranged that the limited pulse length range of the GYRO SENS facility is able to cover the full rpm range of RevLock.

On balance I would go for the latter arrangement.

Best regards

Colin
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