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HomeAircraftHelicopterBeginners Corner › something is wrong here..help needed
07-17-2002 01:57 AM  16 years agoPost 1
SyPToR

rrNovice

Santee,CA

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Maybe one of ya'll can help me out here.

i had an crash last week and rebuild the ehlo, new clutch + liner , new sets of blades , new main shaft , new tailboom and 2 new feathering shafts...ooh and i installed 3 new servo's on the collectives and the pitch (i had some futaba 3001's brand new) my FMA had cracks in them so i decided to replace them.


now here's the funny part i got the engine dailed in about 98% right, that's not teh weird part, whenever i spool up and it gets light and i give full right rudder the ehlo jumps up about 3/4 foot, on the other hand if i give full left rudder you will see the pod bend down so the ehlo want s to go down...

any idea's on what might be causing this event ?...kinda disturbing and it almost costed me an boom strike.....

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07-17-2002 02:42 AM  16 years agoPost 2
Parsifal

rrVeteran

Singapore

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Sounds like you got some mixing going on there...check your transmitter for any mixes that link your tail to yout throttle or pitch servos.

Either that our you are subconciously moving the throttle up when you push right tail and down when you push left tail.

Personally, i think its some mixing on your transmitter which is causing this.

Indy

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07-17-2002 02:51 AM  16 years agoPost 3
SyPToR

rrNovice

Santee,CA

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i can actaully move the throttle trim all the way up to make it run high idle and you can see the ehlo do the same thing....my max pitch ain't but +6 degrees so i got to move the stick almost almost to 80% before it starts to hover.......and it's not just gently going up it really jumps up....in litterly a sec orso it on 3 feet...it's not a little jigger in the setup.

i'll check my radio, although i haven't messed with my radio....

it never did this....i just rebuild the helo and never touched my radio set-up..i'm just wondering where it's coming from...

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07-17-2002 03:43 AM  16 years agoPost 4
SyPToR

rrNovice

Santee,CA

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my revo mixing was on does that cause the described problem ?...

btw my radio is an Futaba T6XA

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07-17-2002 04:43 AM  16 years agoPost 5
SyPToR

rrNovice

Santee,CA

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heh and in plain english ?...lol

first of all english is not my native laguage although i live in the US.

i'm an newbee to helo's, i'm trying to learn and i do read alot but i can't teach myself eveything in 2 weeks...lol

no offense intended

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07-17-2002 05:15 AM  16 years agoPost 6
ncostes

rrVeteran

Va, US

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Definitely sounds like somehow you have your rudder servo controlling your collective??? Or some mixing in the radio but you said you didn't touch the radio.

When you have the engine off, does the swashplate move like you expect as you actuate the controls (assuming mode 2 - throttle/pitch/rudder left stick cyclic right stick)?

What happens to the swashplate/tail rotor blades when you do the following (expected results are in parenthesis, check yours against this - please correct me if I'm wrong it's late)...

1. Push the right stick forward (swash tilts towards front of heli)
2. Back (swash tilts towards tail of heli)
3. Push the right stick left (swash tilts left - as seen from the back of the heli)
4. Right (swash tilts right - as seen from the back of the heli)
5. Push the left stick up (swashplate should move up and your throttle should open)
6. Down (swashplate should move down and your throttle should close)
7. Push left stick left (depends - if main rotor rotates clockwise and you have a pusher tail that comes up into the wash, should decrease the pitch relative to the boom. In any case you should only see the T/R move, nothing else unless you have some rudder/throttle or rudder/somethingelse mix).
8. Right (opposite of #7 )

If your radio is set up with nothing but revo mixing you should not see any coupling except you should see a momentary increase in tail rotor pitch (increase meaning the tail rotor will compensate for main rotor torque more) when you raise your throttle, and a momentary decrease in t/r pitch when you drop throttle.

I hope this helps - someone correct me if I'm wrong.

Thanks
Nick

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07-17-2002 05:28 AM  16 years agoPost 7
Kurt64

rrVeteran

Salladasburg, PA

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I hate to ask a stupid question, but are your servos plugged into the right channels on the reciever?

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07-17-2002 05:43 AM  16 years agoPost 8
SyPToR

rrNovice

Santee,CA

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Kurt you an life saver...

regarding that last question....not too dumb, i didn't have it plugged wrong i just had my gyro on the wrong channel...in other word my gyro was on my collective...so when i hit the rudder the gyro corrected like it supposed to but it corrected the pitch servo....OOOOOPSS


Lesson learned....god do i feel stupid....

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07-18-2002 09:30 PM  16 years agoPost 9
kovar

rrApprentice

West Chester, Ohio

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It happens
It happens to some of the best of us. It's a good idea to do a pre-flight check each time. Check what ncostes said to make sure all the controls are working the way they should. Also make sure you get a buddy to make sure the same is true when you are 50 feet or so away to check the range.

Happy flying.

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