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T-REX 450 › Align GP 750 gain for Trex 450 Pro
04-06-2009 04:45 AM  9 years agoPost 1
zsultan

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USA

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Hi,

My Trex 450 Pro tail doesnt seem to hold good with GP 750, it may be the gain of the gyro. i tried range of gains from 60 to 46 on gear channel of DX7 with no luck the tail seem to move horizontally little bit and also when i pump positive pitch or move the tail it jerks and then stops.

What kind of gain do you guys have on ur Gp750s? I have setup the gyro per the manual and the tail pitc slider has equal travel on both the sides.

Please advise.

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04-06-2009 03:23 PM  9 years agoPost 2
caseyjholmes

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Portland, Oregon

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70% gain no wind,
68% gain for 10-15mph wind
Adjustable in flight via my Gyro dual gain switch on my Futaba 7C radio.
If I remember correctly, 70% in Futaba is somewhere near 62% with Spektrum.

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04-06-2009 03:26 PM  9 years agoPost 3
zsultan

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USA

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Thanks caseyjholmes

Will try today

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04-06-2009 03:33 PM  9 years agoPost 4
caseyjholmes

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Portland, Oregon

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Did you lube your dampers?
Make sure your main and tail blades aren't too tight too. They should be snug but not too hard to move. Might be where your vertical bounce is coming from, but hard to say.

Edit:
ok, now I see you said horizontal bounce..
Like a kick at punchout?

That's usually the linkage. You might end up having to move your ball in on the horn so you can increase your limits, and then get the linkage center adjusted so no kick on climbout.

That sometimes mean the tail blade pitch when the servo is center is not what it needs to be. The gyro has to try harder/longer to compensate and you see the delay as a tail kick when you punch out.

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04-06-2009 07:55 PM  9 years agoPost 5
zsultan

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USA

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caseyjholmes,

Not only when you punch the throttle. even when i move the rudder stick it jerks and then stops. i have the ball link on the inner most hole on the horn as per the manual.

I have a question regarding delay setting on the gyro, i have set it red LED i believe its no delay, is it right? manual talks about setting 0% and 100% with rudder stick movement which i didnt follow.

THanks

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04-06-2009 08:41 PM  9 years agoPost 6
caseyjholmes

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Portland, Oregon

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I have my delay on "red" and once it goes red, I return the stick to center and then press the button to finish the programming cycle. I did not read on how to set the delay, that's just the way I did it. All I read was that "red" delay means micro/mini helis, and I used it.

What you are explaining here, I have yet to experience with this gyro.
I'm still as new to it as you are
Not only when you punch the throttle. even when i move the rudder stick it jerks and then stops.
Sounds like some sort of bounceback problem? Like it's overshooting and then returning?

Are you positive your linkage is very free? Even with the arch to the servo from the slider arm through the guides, my tail rotor linkage is still basically very smooth and easy to operate. Any stickiness here might cause that problem.

Also, even though you are in the closest hole to center on the horn, you might want to drill one even closer in and try it like that just to see what happens. I think they provided me with an extra tail servo arm. If you have one extra too, you can use it for experimenting without hurting the one you are using now.

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04-06-2009 09:24 PM  9 years agoPost 7
zsultan

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USA

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caseyjholmes,

I reduced gain to 51% and it feels better but the tail wag didnt go away completely, its more pronounced in low head speeds like normal mode.

BTW, does wind play any role in the tail wag? it was little windy around 8 to 10 mph when i tried it.

Is the tail on your 450 Pro rock solid?

Thanks

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04-07-2009 02:52 AM  9 years agoPost 8
caseyjholmes

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Portland, Oregon

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Is the tail on your 450 Pro rock solid?
Pretty much. Didn't get any blowouts or anything on the few flights I have on it. No problems to report from the rear end.
BTW, does wind play any role in the tail wag? it was little windy around 8 to 10 mph when i tried it.
Excessive wind could get your heli wagging. (amongst other funny pitch jumps and unexpected things) That's why I like to be able to adjust my gain in flight to the conditions.

Seems like you should be able to find a single gain at which it will not wag in regular 0-10mph winds..

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04-07-2009 03:52 AM  9 years agoPost 9
whyfly

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Temecula C.A.

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I have mine set at 30% holds like a rock, anything above that I would get a little wag

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04-07-2009 04:01 AM  9 years agoPost 10
zsultan

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USA

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I have mine set at 30% holds like a rock, anything above that I would get a little wag
Are you using DX7 radio and setting gain on GEAR channel? i have gain at 51% on mine will go as low as 30% and see.

Thanks

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04-07-2009 04:17 AM  9 years agoPost 11
whyfly

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Temecula C.A.

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yup set at gear and DX7.

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04-07-2009 06:26 PM  9 years agoPost 12
zsultan

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USA

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caseyjholmes and whyfly,

Reduced gain to 35% and its very good now, i will play with it little bit more.

Thanks for your help guys.

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04-12-2009 11:45 AM  9 years agoPost 13
# 1 VIBE USA

rrApprentice

North East,VT

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how far out from the post do you have the ball and which arm are you using setting mine up today.

can u make it go faster

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04-12-2009 03:49 PM  9 years agoPost 14
zsultan

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USA

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Inner most hole and using the arm that comes with the kit,

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