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Home✈️Aircraft🚁HelicopterHIROBOOther › Eagle Freya EX : rudder freeze in stall turn / 540
07-22-2006 11:10 AM  14 years ago
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croc

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France

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Eagle Freya EX : rudder freeze in stall turn / 540
Hi,

I have a SST Eagle freya ex and each time i'm doing a stall turn or 540 rudder freeze and heli stay as it in vertical position.

There is no problem for loop, roll , fast forward, or others.

And it's only in vertical position : 540 and stall turn can be done if heli is not in vertical position.

I've others helis and never this happend.

All electronics has been changes : gy601 bye gy611, rx, servos, tail servos and radio heli program changed..


Last flight rudder freeze before a stall turn and then move slowly and made a 360° but i've not give any radio movement to do that.

any ideas ??? I've changed antenna position..


can it be a failsafe that reset gyro for x seconds ?

regards


croc
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07-22-2006 06:53 PM  14 years ago
JoeHeli

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Hi Just went through same thing with my Tempest Fai.
It was loking out and going into Failsafe for a split second, Thats why it seems the tail locks up.
I have a WCEX2 as well and same carbon as Tempest. Check everything, somehthing is loose. In My case the remote glow plug wire that I had tied to frame had a bare spot in the insulation which was hitting the carbon. Used some spiral wrap and moved it, all fine now
Good Luck
CrazyJoe
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07-22-2006 07:12 PM  14 years ago
john2kx

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Augusta, Ga

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Croc,

Having a tail rotor problem just last month, I can relate to what your going through. Since you have replaced gyro, rx, servo and rerouted your antenna, I am guessing you have a problem that is related to engine speed. Since your problem happens when your machine is vertical your engine speed is probably increasing when in this position. You did not mention if you have a governor.

I suspect that there is some type of metal to metal contact on the heli that occurs at certain engine speeds. Double check all metal parts and pay close attention to muffler brackets and bolts.

You may want to also firmly secure your rx crystal with tape or some other adhesive. Also make sure your rx antenna is not making contact with tail boom supports. That was a contributor to some of my radio glitches.

John
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07-23-2006 01:44 PM  14 years ago
Eagle

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Australia

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I had a similar problem on one of my Freya WCs. I found that the skid brace that wraps around the skid was loose. To cure the problem, I pulled the metal landing gear apart and cleaned it and put it back together using a smear of silicone where the brace is located and 3mm x 10mm bolts instead of the supplied 3mm x 8mm bolts. Never had a problem after that.

Hope this helps

Cheers
Brendan
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07-23-2006 09:11 PM  14 years ago
croc

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France

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thx to all
In My case the remote glow plug wire that I had tied to frame had a bare spot in the insulation which was hitting the carbon.
today i've removed remote glow plug and...after four flights with many stall turn and 540 the problem seems to be gone !!!

i'll confirm that next week but i'm happy :=)


Eagle,
my skid brace are loose and i'm going to fix that too.

cheers


croc
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07-23-2006 11:36 PM  14 years ago
JoeHeli

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Glad to be of assistance,
When it comes to Carbon Framed helis always keep the Glow plug wire shielded as well if usuing the metal landing gear on the WC Hirobos, check those screws. Personally I switched to Plastic landing low profile struts
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07-25-2006 01:40 AM  14 years ago
iyoy

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Bacolod City, Philippines

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Croc,
That is clearly a case of your Rx going to failsafe as a result of some resonance produced by vibration of something loose rubbing against something else. I have experienced this countless number of times in my EXII and each time, after checking and double checking everything, I always find a culprit just when I thought I had everything covered. The usual suspects are:

1) Skids loose against landing gear, specially if you are using metal landing gear. Good idea to use plastic.
2) Landing gear loose against frame.
3) Mechanical mount loose against frame
4) Capscrews for frame crossmembers
5) Crossmembers for canopy mounting
6) Cooling cover screws
7) Cracked horizontal fin band, loose mounting
8) Cracked vertical fin band
9) Worn muffler dampers/ o-rings

As well as a host of many others...Remember, anything that produces the right frequency noise can trigger the Rx to go to failsafe.
iyoy
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07-26-2006 02:22 AM  14 years ago
Agilefalcon

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Fort Worth, Texas

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I've learned that on a carbon frame machine, you must make every effort to ground parts completely to each other.

On my Eagle II EX, after many months of troubleshooting, the solution was to retap all the aluminum blocks to remove the anodizing from the internal threads.

My Eagle never glitched again after that. I used the Dubro metric taps which were inexpensive and very sharp.

If you re-tap all the blocks and fittings, your machine should be very close to being well grounded.

The only other thing I did was to ground the tail boom to the main frame with a jumper wire.

Cheers,
Chris Berardi
Team BobbyJack's Hobbies
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