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HomeAircraftHelicopterAlignT-REX 600N › Jumping Servo Question
10-19-2009 06:14 PM  8 years agoPost 1
bart2546

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Canal Winchester, OH - USA

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Hello again to all.

My next question again falls for the 600n.

I noticed while testing servo movements and doing a general check of the bird on the bench that the servos will jump to a difference position in certain situations.

This is what happens: If I hit: idle up 1 or 2 or throttle hold the servos will jump up and raise the swash maybe 1/8 of an inch (give or take.)

Obviously I do NOT want this to happen. I want to be able to hit either of those switches and just have everything related to the pitch of the blades stay the same. Do you have any ideas/suggestions/or know for sure what would cause this?

I'm running a Futaba T7C with all Futaba servos & receiver.

Thanks in advance!

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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10-19-2009 06:16 PM  8 years agoPost 2
jackheli

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Vancouver - Canada

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My first guess would be to check the hover trims, but I am not sure the 7C has them...

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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10-19-2009 06:18 PM  8 years agoPost 3
maveric4

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england

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First check to make sure you have exactly the same trim possition set for all flight modes, I am not familiar with your TX but lots of other radios have independant trim settings for each flight mode. That would cause a jump in swash between flight modes. Also check to make sure you have mirror pitch curves.

Hope that helps

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10-19-2009 06:36 PM  8 years agoPost 4
bart2546

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Canal Winchester, OH - USA

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I do have hover, I guess, curves for both throttle and pitch so maybe that is it. Do you know if I can turn those off or if they must be activated to successfully fly the heli?

Thanks so much!

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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10-19-2009 08:41 PM  8 years agoPost 5
jackheli

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Vancouver - Canada

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On the 9 and 10C there is an inhibit menu option under the advanced menu that would turn off the hovering trims. Would the 7C be the same?

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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10-19-2009 08:43 PM  8 years agoPost 6
bart2546

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Canal Winchester, OH - USA

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That's what I was referring to. I don't see why they would need to be on as I do NOTHING advanced with the heli and some more basic models have nothing of the sort so I figured why not inhibit them. But I wasn't sure and wanted to ask so I do not destroy it doing something totally stupid.

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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10-19-2009 08:51 PM  8 years agoPost 7
BarracudaHockey

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Jacksonville FL

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If you set up the heli in normal mode, and the pitch trim wasn't centered, then you're going to have to inhibit them and start over.

Always do your setup in Idle up so none of that mixing applies.

Andy
AMA 77227
http://www.jaxrc.com

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10-20-2009 12:32 AM  8 years agoPost 8
jackheli

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Vancouver - Canada

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Futaba radios normally come setup from factory for FAI flying, where you would normally hover at centre stick and the trims would make sense. I never found anybody that made use of them on 3D...

I know it is a bummer, but you need to inhibit them BEFORE you start your setup.

As BarracudaHockey hockey mentioned, you will need to recheck your pitch and throttle settings to make sure they are still true once turn the trims off.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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10-20-2009 11:15 AM  8 years agoPost 9
bart2546

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Canal Winchester, OH - USA

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Thanks for the input everyone. I have a feeling I am going to have to start all over again. Or just not worry about it since it's not that much of a change.

I tried going in and turning off both hover throttle & hover pitch and it was with no luck. I'm not sure what's going on.

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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10-20-2009 04:31 PM  8 years agoPost 10
BarracudaHockey

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Jacksonville FL

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My advice, start over.

Setup the model in Idle up.

Set your 3 middle pitch points to 50, get everything square, then setup your curves. (That way if the stick is anywhere near centered, the servos WILL be centered exactly.)

Andy
AMA 77227
http://www.jaxrc.com

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10-20-2009 05:23 PM  8 years agoPost 11
bart2546

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Canal Winchester, OH - USA

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Thanks again. I will do that this evening I think.

My only question though is: what is the reasoning that the situation won't just be reversed instead? Meaning that if I switch from idle up to normal mode, won't it just make the jump down instead then?

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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10-20-2009 06:26 PM  8 years agoPost 12
BarracudaHockey

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Jacksonville FL

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If you inhibit the pitch trim, and your pitch curve from center to the top matches idle up and normal, then it won't jump.

Andy
AMA 77227
http://www.jaxrc.com

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10-20-2009 06:32 PM  8 years agoPost 13
bart2546

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Canal Winchester, OH - USA

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Thanks for all the help. I hope someday I can understand this stuff and be as effective at giving good help as you are!

Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231

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10-20-2009 06:41 PM  8 years agoPost 14
jackheli

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Vancouver - Canada

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I hope someday I can understand this stuff
The purpose of the trims are straightforward: if you are trying to hover at mid stick it could happen that no matter how good your setup is the heli would hover above or below the desired centre stick, and be at a higher or lower rpm than desired. It has to do with climate conditions at the time you are flying.

Having said that, the trims allow you to adjust and customize the pitch and throttle curves to the actual flying conditions, making it possible to configure the heli to hover at exactly mid stick independently of the environment.

This feature is useful if you are trying to nail down the strict hovering patterns and hovering maneuvers required in FAI/F3C.

For 3D, where you hover at 3/4 stick, they are a pain in the neck...

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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