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08-23-2008 07:24 PM  12 years ago
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bobmoser

rrApprentice

Edmond, OK

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TJ Pro will not hold???
Okay, I am still having an issue with my throttle jockey pro governor. After setting it up with the instructions at least three or four times I still can’t get the thing to hold steady in the high setting.

I am using it on a MA Stratus geared @ 8.18 with a OS .91 SX w/pump.

After punching all the information in the TJ excel spreadsheet, it tells me to set my low gov. set points on my FUT 9C radio to 69.8 and the high to 74.9 for a 1650 to 1800 rpm rotor head speed respectively. This is all fine but any time I bring the governor setting on my radio higher than 70% the throttle servo starts to oscillate and will not hold at all. I have adjusted and replaced the magnet sensor and reprogrammed the throttle position a few times. The funny thing is I can set it to 63% for hover and 69.5% for IDL1 and everything works fine its just when I move the switch to IDL2 and it goes to the 74.5% range and seems to loose it. Has anyone seen this problem? If so, any information would be much appreciated.

Thanks,
Bob
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08-24-2008 12:32 PM  12 years ago
Laurens

rrKey Veteran

Oegstgeest, NL

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Whats your throttle curve in idle up2?
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08-24-2008 03:04 PM  12 years ago
JuanRodriguez

rrProfessor

The Villages, Florida

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Bob.....
I don't know if this is your problem but your headspeed using the normal curves must be AT LEAST OR HIGHER than the "target" headspeed you want to maintain with the governor "on".......

It sounds like your headspeed with the curves is too low for the governor to properly lock in at the ATV range you're attempting.....

I'm not familiar with the "spread sheet" you're referring to but the "RPM Calculator" that is/was on their website is know to be unreliable......

Try setting things up as I recommend and see what happens.... it will take you only a few minutes to try....

Just as an example...... if you want to maintain a headspeed of 1800 with the governor, your headspeed with the curves should be very close to 1800 or higher. For your ATV's, start at something like 55 and work your way up..... you'll discover soon when you fall into the "adjustment" range......from there, just tweak the ATV to give you what you want.....

A couple of us scratched our heads for days trying to resolve basically the same issue until we stumbled onto the solution.... then we discovered that others were having similar problems and learned to disregard the RPM calculator found on the Model Avionics website......

Let me know if that works for you....
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08-24-2008 04:22 PM  12 years ago
bobmoser

rrApprentice

Edmond, OK

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It defiantly looks like my throttle curve is too low in the midrange. I just checked it for IDL2 and they are as follows:

1) 100
2) 75
3) 50
4) 75
5) 100

For some reason I have the mid range lower than IDL1 not sure how I did this, it is probably my problem. Next time I go to the field I'll use JR's method and see how it goes.

Thanks,
Bob
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09-04-2008 07:17 PM  12 years ago
JuanRodriguez

rrProfessor

The Villages, Florida

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Never heard back from you......
Did you get the problem resolved ??
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