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Blade 120 SR, Trim problem.


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lillpojken
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Joined: 28 Jun 2011
Posts: 71
Location: Bassano, Alberta Canada

PostPosted: Sun Jul 10, 2011 12:49 am
PostPost subject: Blade 120 SR, Trim problem.
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Having problems with forward trim on this helicopter.
It wants to move slowly backwards with neutral stick movement no matter how much forward trim I give it.
Has anyone had the same problem. ?

Richard.
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pjdog
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Joined: 12 Jan 2010
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Location: Hudson, Florida, USA

PostPosted: Sun Jul 10, 2011 1:31 am
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Move your battery forward a little. Sounds like a weight distrabution problem to me.
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tombo242
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Location: Santo EstÍv„o, East Algarve, Portugal. 78, but still feels 18.

PostPosted: Sun Jul 10, 2011 2:30 am
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Totally agree with Jack there, if the CG is off then it won't fly right!

Tom.
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nick_onelove
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Joined: 01 May 2011
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Sun Jul 10, 2011 6:12 am
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Didn't you mention having training gear on it? If so, move it forward so the CG is right as mentioned above.

If not, couldn't he just lengthen the elevator servo linkage so that he doesn't have to modify the battery tray?
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lillpojken
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Location: Bassano, Alberta Canada

PostPosted: Sun Jul 10, 2011 6:45 am
PostPost subject: Sorry I screwed up, I said problem with 120SR trim.
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I ment the Blade mcx2 had trim problem.
Otherwice it flies good but have to keep a little forward stick all the time.
Same problem with 120maH bat and the 150maH bat.
Don't want to try to alter the linkage rod, I may run into bigger broblems.
Will try a little lead in the nose.

Richard.
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nick_onelove
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Sun Jul 10, 2011 6:58 am
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What do you mean "bigger problems"?

I just popped the canopy off my mCX2 and the servo linkage comes off of the swashplate ball link very easily, I just twist it and it peels right off of the ball link.

The linkages have a bend in them, so you could also just take some needle-nose pliers and pinch the bend to shorten the elevator servo.

I don't think it's worth decreasing flight time with lead when the problem could be easily solved without it.
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lillpojken
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PostPosted: Sun Jul 10, 2011 7:14 am
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nick_onelove wrote:
What do you mean "bigger problems"?

I just popped the canopy off my mCX2 and the servo linkage comes off of the swashplate ball link very easily, I just twist it and it peels right off of the ball link.

The linkages have a bend in them, so you could also just take some needle-nose pliers and pinch the bend to shorten the elevator servo.

I don't think it's worth decreasing flight time with lead when the problem could be easily solved without it.


Yes I agree, I just had a look at it, I will try for a small amount bend in the wire and see how it flies.
Thanks.

Richard.
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nick_onelove
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PostPosted: Sun Jul 10, 2011 7:25 am
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Good luck! Let us know how it goes.
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lillpojken
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PostPosted: Sun Jul 10, 2011 7:48 am
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lillpojken wrote:
nick_onelove wrote:
What do you mean "bigger problems"?

I just popped the canopy off my mCX2 and the servo linkage comes off of the swashplate ball link very easily, I just twist it and it peels right off of the ball link.

The linkages have a bend in them, so you could also just take some needle-nose pliers and pinch the bend to shorten the elevator servo.

I don't think it's worth decreasing flight time with lead when the problem could be easily solved without it.


Yes I agree, I just had a look at it, I will try for a small amount bend in the wire and see how it flies.
Thanks.

Richard.


Fixed the trim problem.
I shortened the elevator control linkage by 0.025 ich
Measuered from the table top with a digital caliper to the top of the ball joint
before bending the wire and and than after bending the wire.
I think a few tumbles hitting object added to the change in pitch, other wise this is a tuff bird.
The bend in the control wire is there for that reason I think.

Richard
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nick_onelove
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PostPosted: Sun Jul 10, 2011 8:02 am
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Congrats, good to hear! If you haven't already, you should put the transmitter trim back to neutral and shorten the linkage more as needed.

Anyway, how has the 120 SR been treating you?
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lillpojken
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PostPosted: Sun Jul 10, 2011 8:28 am
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nick_onelove wrote:
Congrats, good to hear! If you haven't already, you should put the transmitter trim back to neutral and shorten the linkage more as needed.

Anyway, how has the 120 SR been treating you?


Not to good with the 120SR the wind has been too strong so far.
It's more like how I have been treating it, very kindly on the table. ha ha

Richard.
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mjg44mjg
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Location: Aberdeen, Maryland

PostPosted: Mon Aug 08, 2011 6:39 am
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I feel ya on the windy days... I have been waiting to get my 120 SR outside... I have a huge field right down the street, and I just moved the swash to the advanced setting on it and am dying to get it up in the air... So far whenever there is no wind at all its right after a rain and the field is soaking wet... Last thing I need is to crash my 120SR in a sopping wet field.... Tshe wife would be pissed if I had to spend more money on parts.... LOL
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lillpojken
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PostPosted: Mon Aug 08, 2011 8:09 am
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mjg44mjg wrote:
I feel ya on the windy days... I have been waiting to get my 120 SR outside... I have a huge field right down the street, and I just moved the swash to the advanced setting on it and am dying to get it up in the air... So far whenever there is no wind at all its right after a rain and the field is soaking wet... Last thing I need is to crash my 120SR in a sopping wet field.... Tshe wife would be pissed if I had to spend more money on parts.... LOL
.
Yes stay out of the wind if you can, best time to fly is in the morning before the wind starts up. I have been grounded for about two weeks now , 3 tail motors so for , Now changing the 5 in 1 board and a new Tail motor hope this helps me. This is getting costly. Glad to have the Clearview flight sim to practice on and slowly getting the gang of that.
Keep flying....
Richard.
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