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09-06-2006 09:28 PM  14 years ago
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Chris Herzog

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Covington, La. USA

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TJ Pro question
Guys,
I recently installed two TJ Pros on my two machines and they work awesome...I love them and don't know why anyone would fly without them.

My question is this...

This has happened twice now, once on each machine and it's not a big deal just wondering why it does this. OK, I go to crank one of the heli's up, I turn on the trans, check to make sure that I'm on the right model, then turn on the receiver. I watch the light on the 401 and when it goes solid (heading hold) I put the plug igniter on and fire her up. If I don't move the throttle before I start her up...the throttle is in the wide open mode. If I simply move the throttle just a little and then put it all the way in the down position, she cranks fine.

Any idea on why the throttle goes to wide open? I know that I'm not wide open when I turn it all off after a flight.

Thanks,
C Herzog
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09-06-2006 11:21 PM  14 years ago
tmonson

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USA

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Which radio are you using?
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09-06-2006 11:29 PM  14 years ago
Dr.Don

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Cedar Park, TX -- USA

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Chris, if I remember correctly you're on a 9C? I have never experienced what you describe with my TJ and 9C setup. Is your throttle stick all the way down when you switch on the heli receiver? It could be that if the stick is above 25% the TJ is activated and commands full throttle trying to achieve the headspeed setting even though the engine is not yet started. Make sure the stick is full down and the idle up switch is off (normal mode) when you switch on.

2atlo8
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09-06-2006 11:46 PM  14 years ago
andyp

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New Zealand

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Let me guess ... JR radio, throttle channel 'reversed', low ATV >108% (or some 'low' subtrim used)? It only happens if you turn the Rx on with the throttle stick + trim all the way back, and dont move the stick prior to trying a start?

The TJP does not like this scenario and will exhibit this (dangerous) behaviour. It is reproducible. There was a warning on the Model Avionics site after I pointed this out to Kurt in November last year, but the warning has disappeared.

Kurt did point out that the color LED's show the wrong colours when calibrating, but all does appear to work.

Solution: Re-do the linkage with 100/100 ATV and no subtrim and then re-calibrate and my bet would be problem solved.

Perhaps a timley reminder of this problem.

Of course it is all related to the pulse width range the throttle servo is working thru - so potentially it could happen with a Futaba set but would need some wacky ATV or subtrim numbers.

Andrew
QuickUK Flight Team
Fromeco Regulators and Batteries
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09-07-2006 12:59 AM  14 years ago
Chris Herzog

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Covington, La. USA

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Thanks guys for the replies.

I'm have a 9C super and I have the jockey set to not come on until right at half throttle. Once I go just beyond half I hear it kick on and with a little more input on the throttle I'm hovering. When I'm in idel-1 it's on all the time and never goes off.

I have been flying my 30 for two weeks with the TJ on board and this never happened. Last week I put a TJ on my 60 and flew it for the first time this past Sunday. Everything has worked great so far but both my 60 and my 30 started at full throttle and scared the crap out of me. After the second time this had happened, I made it a point to watch the throttle linkage move as I worked the stick on the radio before I would start it. When doing this, I never had any other problems. I do know that I'm not even close to 100/100 on my throw with the 60, for no other reason than being lazy. Before I go back out to the field this weekend, I plan to set both machines up at or close to 100/100. I don't use any sub trim on anything, I'm all zeroed out with that. I just was not sure if this was something that I should have been aware of. Other than this little problem, I'm sold on the TJ pro. It's much easier than chasing a throttle curve all day.

Thanks again,
C Herzog
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09-07-2006 01:24 AM  14 years ago
gmacs

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Long Island, NY

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Full Throttle Start
Chris, that is a very serious problem full throttle start, I install a TJ on my R-30 Futaba 8UHPS using the instructions from MA web site
work and cal no problem.

Check the web site for the 9C and recal your setup.

Good luck..
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09-09-2006 06:20 PM  14 years ago
gmacs

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Long Island, NY

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Chris,I'm Curious, have you solve your TJ and 9CS problem?

gmacs
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09-10-2006 04:42 AM  14 years ago
Chris Herzog

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Covington, La. USA

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I'll let you all know when I get home tomorrow.

C Herzog
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09-10-2006 09:42 PM  14 years ago
Chris Herzog

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Covington, La. USA

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Problem solved!!!

I went to the Model Avionics sight and followed the instructions for my radio, a 9C Super and recalibrated the governor. It works great now and I have no complaints what so ever.

I also want to thank Model Avionics for getting in touch with me, totally unsolicited and giving me some help and guidance with this little problem. I wish all manufactures did stuff like that.

C Herzog
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09-10-2006 10:23 PM  14 years ago
gmacs

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Long Island, NY

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Now that you have that problem solved, you are going to love the way
TJ hold your head speed, I install it on my R-30 just to see how it worked, as soon as I find the time I'm going to install another unit on my OS-70 Raptor.


"unsolicited help and guidance. I wish all manufactures did stuff like that".

Very good point.

gmacs..
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10-10-2006 02:19 AM  14 years ago
Rotary R/C

rrApprentice

Sudbury, ON Canada

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I have run into some similar issues with my TJ pro. Very scary. I run a 6EXhp so I have to run in "manual" mode because the 401 has my only available channel. I started up today and it was at full throttle even though my stick and idle up said differently! Throttle hold wouldn't work and neither would throttle kill, I had to pinch the fuel line to kill the engine. I also noticed when calibrating the TJ pro it sometimes seemed like it was "reversed" for some reason, I had to recalibrate about 5 times. I enter the cal mode with my throttle stick all the way down, then move it all the way up then back down. Get out of cal mode, test the new setting and what would happen is the light would come on at 0% throttle and then turn off once I hit 75%, which is backwards. I have now confirmed that my throttle kill button will not work when the TJ pro is "in the loop", If I connect the servo directly to my Rx it works fine

Guess I'll check their web site.

Marc
Love my life, love my wife but my heli is my mistress! :D
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09-02-2007 02:22 PM  13 years ago
Torkroll

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Bakersfield Ca

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I am having this problem.
Backwards on a Spektrum set-up.

It works correct when I move it to a Futaba heli.

I have done it more than 5 times, it won't go correct.
Anyone who says it's a small world never tried to walk to Zimbabwe.
Jerry
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