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Home✈️Aircraft🚁Helicoptere-AlignT-REX 600 › TREX 600EFL PRO OFFICIAL THREAD 2
12-28-2014 10:56 PM  5 years ago
pitfall

rrApprentice

england

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Hi Guy's

I've built a trex 600e gpro dfc and having a problem with the tail. i have the tail servo at 90, as the manual say. the tail rod ends are screwed all the way in, the tail blades have approx 10mm in the opposite direction, front tail blade pointing to the right instead of left as per the manual. when looking at the rear of the heli

i thought the rod lenght could be wrong so i checked that and its the correct lenght as per manual, then i checked the tail boom is fully home and tail drive unit.

the only thing i built different from the manual was put the tail servo on the other side

if i off set the servo horm i get a tail bounce when turning to the right.

what do you guy's think i should do,
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12-29-2014 12:19 AM  5 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Whether you have the tail servo mounted on the left side frame, or the right side frame, as long as the servo is mounted so the output shaft/wheel is offset toward the rear of the heli, the pushrod should end up being the same length. If you happen to have the servo output shaft/wheel offset toward the front of the heli, then the pushrod appears that it will be too short to do the job properly.

Mounting the servo on the other side of the frames ONLY causes you to have to reverse both the direction of the rudder servo in your transmitter, AND within the GPro settings menu, to get the rudder to function properly. In the end, you want right rudder to make the servo PULL the tail pushrod FORWARD, to the nose of the heli, and when you pick the heli up and turn its nose to the LEFT, the gyro needs to make sure to have the servo pull the tail control rod FORWARD, to the nose of the heli. Both of these need to be set correctly. I assume you have the tail pushrod mounted ABOVE the tail rotor servo centerline, and not below the centerline -- as shown in the assembly manual.
the tail blades have approx 10mm in the opposite direction, front tail blade pointing to the right instead of left as per the manual. when looking at the rear of the heli
There should be NO difference here, either. As a matter of fact, if you have this WRONG (as it appears you do), the tail will behave rather strangely.

The key to that picture, by the way, is to make sure that at NEUTRAL rudder with the gyro in Rate/Normal mode, the PITCH SLIDER is to be centered in its travel along the tail rotor shaft. If this is way off, it could well explain the tail bounce problem you are seeing. The way to check this is to put your heli in rate/normal mode, and hover the helicopter. It should hover without wanting the nose to turn left or right on its own. Adjust the tail rotor pitch linkage till you achieve that trim. Re-set your rudder endpoint travel limits in the gyro settings and you should be good to go in Heading Hold mode.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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