magnum

OK,

Had a little oops after I got my Trex going. Hovering good, and thought I had very little negative pitch. Well I did. However when I would pull the throttle back, the swashplate would come down to where the bottom of the 2 alignment pins coming from the head, were just a hair above the alignment block. When I was hovering I guess a little harder landing than usual caused the block to break one of the pins.

So I replaced the upper head block and reset everything to make sure no problems would crop up this time. But when I went to test hover the Trex, it simply tries to tip over rather than lift straight up. So I stopped and checked the swasphlate movement. It seems like the servos are no longer centering or coming back to neutral. They will if I quickly move them, but a slow move usually leaves the swashplate off center.

Could something have happend to all 3 servos because of this. They are HS56B (or 65B the newest).

From what I can tell there is no binding. I am going to try and recharge a battery, but I can get enough head spead and power to hover, so I must assume the servos are getting enough power.

As far as centering, it is random on all three servos. The heli is the Trex 450SE.

Futaba radio and reciever.

emosolo

Morning,

If its not binding it might be stripped servo gears.

Regards,
Solo.

yvesOttawa

But all three servos are not centering or are behaving this way?? what are the odds of stripped gears on all three.

I assume this is a CCPM (CDE) setup, sounds more like a pitch curve issue. Review your curve and swash mixing and ensure the swash travel is setup properly between 0 and 100%. There's a video on here somewhere which is excellent in explaining exactly how the swash servos are to be setup through the Tx.

magnum

@yvesOttawa
I am at work, but my thoughts were the pitch setup as well.

I have seen the video and used it to originally setup. But adjusted the pitch for the aileron, so I may have messed it up. Will go back and verify settings.

magnum

Got it figured out.

Looks like it was a combination of binding and the pitch curves.

I did notice the flybar is hard to swivel with no linkage connected. So I used locktight and loosened the screws a little. Moves freely now and I don't think I will have a problem of screws backing out.


Thanks... Tomorrow or Sat will be another test flight.

Gitano

wrong click

Gitano

I've seen that this problem is due to the linkage, when you built your T-rex, you should soften all the ball links in the T-rex since they are so hard to move. In my experince with helis is that you should yous a Ball link sizing tool to make more soft all the linkage.

I guess you have all the linkage of the T-Rex very hard.

magnum

I may have 2 theads going on this

But the linkages seem fine. They snap on fairly clean.

I did find 2 balls that were scratched pretty bad, and I replaced them.

When I assembled it this time I double checked that all linkages were free.

magnum

THis problem and the my swashplate problem were solved. Turns out they were not related, but fixed.

This thread explains...

http://www.rcuniverse.com/forum/m_42...tm.htm#4247222