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Oct 05, 2013, 12:26 PM
Heli's rule!
dacaur's Avatar
Quote:
Originally Posted by Red.Sneakers View Post
If the Champ has no throttle and Elev control it will tend to drop out of the sky. So I tried testing binding it with 40% throttle and Elev trim. When I turned off the radio, no throttle. Does it have a failsafe system in the DSMX Rx?

Wha' say you?
...
only the higher end spektrum RX's have settable failsafes for the control surfaces.

As for the throttle, that makes sense that it goes to zero throttle regardless of throttle at bind, considering that in order to bind it with the RTF transmitter, the throttle is most likely going to be at 50% when you bind it... You bind by pushing the throttle stick down while turning on.... would be tough to do that with the throttle stick all the way down. Since these things are made for newbs, sounds like just another case of HH protecting us from ourselves... No matter how you look at it, having throttle "on" during failsafe is a terrible idea....
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Oct 05, 2013, 05:28 PM
Registered User

Thanks


Thank you jarchuk. We took apart the plane and the big gear was chipped. We ordered a new servo for the plane to replace the gear.
Oct 12, 2013, 11:40 AM
Registered User
just got my champ a few days ago,and today was the first flight.
i noticed that no matter how much i trim it, it wants to turn to the left. allso if im turning left it responds quickly, but when im turning right, its like doing a really slow turn...is it possible that the linear servos came out of factory un centered?
Oct 12, 2013, 12:12 PM
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bhoov128's Avatar
isn't very likely, check to make sure the horizontal stab / rudder aren't warped or misaligned. Also double check to make sure the hinges aren't ripped, it could be pulling away in flight and causing your turns.
Oct 12, 2013, 01:03 PM
Registered User
nothing is ripped or warped ...its brand new...i added a pic for you to see..there is a difference of 2-3 mm from left to right




Oct 12, 2013, 03:04 PM
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bhoov128's Avatar
Maybe just a trick of the camera angle but this looks suspicious to me.
Oct 12, 2013, 03:09 PM
The figure "9" Specialist
aeronca's Avatar
Quote:
Originally Posted by david87 View Post
nothing is ripped or warped ...its brand new...i added a pic for you to see..there is a difference of 2-3 mm from left to right




How about a pic from the same top-view angle with the servos neither left nor right, but centered.

Aeronca
Oct 12, 2013, 04:27 PM
Dinosaur
condor12's Avatar
Quote:
Originally Posted by david87 View Post
just got my champ a few days ago,and today was the first flight.
i noticed that no matter how much i trim it, it wants to turn to the left. allso if im turning left it responds quickly, but when im turning right, its like doing a really slow turn...is it possible that the linear servos came out of factory un centered?
G'Day, David87. Mine was exactly the same. I think the reluctance to turn starboard is due mainly to engine torque/prop lift. My rudder turned equally left and right. There were no apparent warpage of the fin, wings or horizontal stab. To fix mine, I ran a bead of epoxy along both sides of the fin base (to stiffen the fin), and put a dab on the horn/rudder interface. I also moved the control rod to the second inside hole on the rudder horn. I also fly with max rates on a DX8. The Champ is now a whole new aircraft with normal turns left and right.
Oct 12, 2013, 05:11 PM
Registered User
Quote:
Originally Posted by david87 View Post
i noticed that no matter how much i trim it, it wants to turn to the left. allso if im turning left it responds quickly, but when im turning right, its like doing a really slow turn...
I'll give the cheap-quick-dirty solution first. And it's not even 'pick any two' they're all valid. First, turn down the endpoint on the left side of the rudder. Second, move the control rod in by one hole to make up for the loss in travel.

But that's a really cheap quick dirty bandaid and doesn't actually -fix- the problem.

This next paragraph I actually wrote *last* but moved it up here because it's a very likely culprit... Check that the hinges are tight. I've had the tape stick to the paint, but the paint peel slightly off the foam, so steering is very sloppy. This is usually caused by various noseovers and 'tail first landings' but it could have been bonked during assembly or packing and pulled the paint loose.

The UMs have so few centimeters of surface areas that -every- cm counts for -more- than in larger planes. I have planes with pieces bent and broken and holes in wings and gouges and chunks missing and they make almost no difference.

A 1 deg twist/warp in the wings can throw it off. Don't just look at the rudder to see if it's straight and parallel to the stab - lay a straightedge up to it and see if any light comes through.

Also make sure the elevator is flat-parallel to the h-stab.

Not likely but check lateral balance by holding the tip of the spinner and the tip of the tail on your fingertips. A fraction of a gram is a lot in a plane that weighs only a few grams.

Quote:
is it possible that the linear servos came out of factory un centered?
There's no 'centering.' It's electronic.

Hey do this... Turn down -both- left and right endpoints. That's often a standard thing to do so the slider doesn't run past the end of the sensor (causing loss of surface response and stall-spin-crash.) You may have -too- -much- travel on one -end-, which you think is the normal side and the 'less responsive' side is the one that's really correct.

Given the number of possibilities and variables and sheer -fragility- it's very possible that a -number- of these factors are out of whack in favor of the left turn that all add up to poor response to the right.
Oct 12, 2013, 05:13 PM
65 years of RC flying
Daedalus66's Avatar
Don't use epoxy for flexible foam such as the stuff the Champ is made from. Use a flexible glue such as Foam Tac or UHU Por.
Oct 12, 2013, 09:22 PM
Registered User
Ginohio's Avatar
Quote:
Originally Posted by aeronca View Post
How about a pic from the same top-view angle with the servos neither left nor right, but centered.

Aeronca
take it back to your LHS and tell them to fly it and fix it.. All this stuff about lateral alignment is gooberish when it applys to the Champ. When my one of 3 was turning left way more than right.. It was the tab at bottom of rudder was broke. Now my LHS guy said this would not cause this but..when I glued bottom tab back on No problems..
Oct 12, 2013, 10:46 PM
Dinosaur
condor12's Avatar
Quote:
Originally Posted by Daedalus66 View Post
Don't use epoxy for flexible foam such as the stuff the Champ is made from. Use a flexible glue such as Foam Tac or UHU Por.
Probably a good general rule. I used epoxy on mine because the fin was very floppy side to side. The epoxy stiffened it right up. Only needed a bead 2mm or so high. Also put two 12mm strips of Blenderm tape along the rudder hinge line (top & bottom) - just in case! Mightn't be everyones cup of tea, but solved my problem. Enjoy the littl'un, it's a top fun machine.
Oct 12, 2013, 10:59 PM
Scout CX | mCX2 | mSR | 120SR
North_of_49's Avatar
Quote:
Originally Posted by condor12 View Post
...
I used epoxy on mine because the fin was very floppy side to side. ...
https://www.rcgroups.com/forums/show....php?t=1683386


Oct 13, 2013, 12:17 AM
Registered User
Ginohio's Avatar
No fair Nortn...we all know how precise your mods are...They are nice tnough..
Oct 13, 2013, 02:52 AM
Dinosaur
condor12's Avatar
Top job, North. I've only got 30 or so flights on mine. If I could be sure I would get a 100 more I'd probably do the same! Not the Champs fault - my flying style...


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