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HelicopterThunder TigerRAPTOR 50 › GY401, tail holds OK in hover, but gain has to be​at 100%
08-06-2007 06:32 AM  10 years agoPost 1
Farrell

rrApprentice

Huntington Beach, CA

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I'm just beginning to fly my new Raptor 50 V2, and it seems like the tail authority is lacking. I have my GY401 mounted in that spot over the tail boom block in the frame. It seems to hold ok in a hover, but when spooling down it doesn't hold very well, and I feel that in flight it may not be up to task.

I have tried all sorts of gain settings, in both HH and rate modes, and I can never get it to lock well, or even wag.

I set my trim in rate mode so that the tail gearbox arm is perpendicular to the tail case like in RaptorTechnique's Tail Pitch page, and it required just one of two clicks of trim in flight to get it perfect. I trimmed it in rate mode of course...

I have a GY401 in my T-Rex 450 and it works flawlessly with gain at 80%/20%, and wags at 85%/15%.

Any ideas?

--Farrell F.

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08-06-2007 11:49 AM  10 years agoPost 2
Ben-T-Spindle

rrProfessor

Central Illinois

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Sounds to me like your headspeed is too low.

... BTS

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08-06-2007 12:11 PM  10 years agoPost 3
amitush25

rrApprentice

netanya - israel

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set up issue

check the limits and i think that you didnt di it correctlly.
it should hunt at 90%

align T-REX600n SUPER pro, 8717, SOLID-G, radix, DX7

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08-06-2007 05:22 PM  10 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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Servo arm is too short, run 14mm and dont play with the trim, mechanically adjust the rod in rate mode so that the pitch slider is 4.5mm from the tail case. Your true gain (not sure how you set it in your radio) should be around 50 percent heading hold gain.

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

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08-06-2007 06:34 PM  10 years agoPost 5
Zaneman007

rrElite Veteran

Texas - USA

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but when spooling down it doesn't hold very well,
Not sure what you mean by that?

Check for:

1) mechanical gain - that is what BarracudaHockeyis talking about. The farther out the ball is from the center of the servo, the more mechanical gain you will have.

2)Is it a futaba radio? Do you have it in AVS or Normal? There should be an A or an N next to the gain number.

3)Where are your endpoints for channel four and five?

4)test the holding power by doing full power climb outs! and not by spooling it down. You will lose holding power as the tail rotor slows down.

5)On my raptors, I have some pitch in tail blades at zero stick to offset the torque of the rotor while hovering. Thus the tail will hold in rate mode with no trim required. This is part of my mechanical set up. After I did this, I had equal travel on the tail slider.

Hope that helped. When it comes to the tail not holding, I have always found that I had an improper setup, either mechanically or in the radio.

Old Guys Rule!

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08-07-2007 12:36 PM  10 years agoPost 6
KasamaJunky

rrApprentice

North Weald, Essex,​England

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Servo arm is too short, run 14mm and dont play with the trim, mechanically adjust the rod in rate mode so that the pitch slider is 4.5mm from the tail case. Your true gain (not sure how you set it in your radio) should be around 50 percent heading hold gain.
Spot-on for a decent tail. This is good advise and will cure your woes

Trex600n pro, Trex700n pro, MiniTitan

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08-08-2007 02:21 AM  10 years agoPost 7
Dusty

rrApprentice

Edmonton, Alberta -​Canada

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I think I'd have to side with the boyz talking about bumping up your head speed.

If you have or know someone with a Tach that would be helpful, but if not, just bump up points 2, 3, 4 by 5 to 10 pecent and see what that does for you. (this would be on a 5 point throttle curve)

When you say that it holds even less when spooling down, that makes me think that points 2 and 3 in the throttle curve are especially low.

Let us know how it turns out.

If that doesn't work... try the longer servo arm theory.
I'd go straight up to about 18mm tho...

Canada Shawn

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08-08-2007 03:21 PM  10 years agoPost 8
BarracudaHockey

rrMaster

Jacksonville FL

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On the stock Raptor tail 18mm will give you too low of a limit pot setting, you dont want under 100 or you risk burning up your servo. You want a balance between mechanical and electronic gain.

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

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HelicopterThunder TigerRAPTOR 50 › GY401, tail holds OK in hover, but gain has to be​at 100%
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