450 doing circles

[wiseman]

just had my 450 out for a test after a little repair, every thing seem to good,it wants to lift off the ground, BUT, it wants to rotate clockwise quickly, i set the flybar and pitch up but wonder about setting the taill blades, do i need to do that.
any help would be appreciated.

[gorber]

The fact that it wants to piro clockwise almost certainly means the gyro is reversed (or hasn't been reversed when it needs to be, if you see what I mean).

[tiddler]

Did you rebuild the tail at all? If so are you sure you connected the belt correctly (ie not twisted)

[wiseman]

Guys, Thanks for your reply but, i have checked the gyro and the switch is in the reverse position, and due to the design there has to be twist in the tail belt,

[rapidgaz]

Put gyro to normal and try


Sent from my iPhone

[pgkevet]

Guys, Thanks for your reply but, i have checked the gyro and the switch is in the reverse position, and due to the design there has to be twist in the tail belt,

Indeed...but is has to be the correct way around. Rotate the head clockwise and the tail blades rotate UP into the downwash..also check you still have leading edge control on the tail blades

[Hawkeye]

and due to the design there has to be twist in the tail belt,

Yes but the twist has to be in the right direction. As for the tail, the tail pitch slider sould be in the centre.

[wiseman]

Ok. i have put the gyro switch to normal this has slowed the rotation down but not fixed it. i have also rotated the head clockwise watching for the tail moveing up into the down wash with the lead edge, this all seems to be correct, i,m going to go back to the beggining and reset every thing..... before i crash it LOL

[wiseman]

Hawkeye
You said about the tail pitch slider, should this be at centre when i do my enitial main blade set up, ie stick at centre pitch zero,,,,, tail pitch slider at centre.

[tiddler]

Guys, Thanks for your reply but, i have checked the gyro and the switch is in the reverse position, and due to the design there has to be twist in the tail belt,

Sorry, yes the belt does need a half turn twist. What I meant and should have said is, are you sure the belt is twisted in the right direction. If its twisted the wrong way it will cause the tail rotor to spin in the Opposite/wrong direction.
To check, turn the main rotors in a clockwise direction and check see that the tail rotor blade that's nearest the front of the heli is moving upwards.
If its moving downwards the belt is twisted the wrong way.


Edit :- Ahhh, too late I see you've already done that.

[waveydavey]

Sounds very,much like the gyro sense needs reversing. Turn the bottom tail blade to 90 degrees so it is parallel with the floor/table/skids and facing backwards like the rudder of a boat. Pick the heli up at the tail hub and slowly in HH move the tail to the left, the tail blade should move in the same direction,if it's the other way then the gyro needs to be reversed. What gyro is it?

[CookieMan]

During the early days, when I was setting the 250SE up, she used to do this:

The Trex 250SE Tail issue? video by Cookie_Man9 - Photobucket

The spin was anti-clockwise. The gyro was reversed but apparently, the belt was not tight enough. Tightening the belt to the right tension, did help the issue, drastically.


Cheers mate.

[wiseman]

Ok, I have now carried out a reset of every thing and found no problems, left the gyro switch at normal (Art Tech ..Isolated gyro V3) and spooled up with a couple foot hover, the heli seems much better albeit a little unstable but atleast its not doing a 360. SO, my next question is, why do i need to put the gyro switch at normal when previous it was fine.
Many thanks to you guys for the help, i just hope its cured......

[Hawkeye]

Hawkeye
You said about the tail pitch slider, should this be at centre when i do my enitial main blade set up, ie stick at centre pitch zero,,,,, tail pitch slider at centre.

You would normally make sure your servo horn is centred ie pointing straight up at 12 o'clock it doesnt matter about centre stick just make sure you dont have any rudder input and no trim or sub trim. you then centre the pitch slider by moving the servo along the boom. forward or back.

[wiseman]

Hi, Guys
need a bit more help with this, i have carried out all the checks followed up on all the advice you guys have given and things have improved, but, when i lift off into a low hover (not very confidant flyer, yet) the heli wants to fly to the left and backwards, help....... im going to do a setting check but thought i would ask just the question.