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HelicopterBeginners Corner › Both blades 12 deg positive but negative one blade 11 one 12???
06-05-2009 05:11 AM  8 years agoPost 1
Spitfire1

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Perth Australia

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I can get both blades zero degrees at mid stick.

My prob is, if I get both blades absolutely spot on 12 deg positive, when I adjust one blade absolutely spot on 12 deg negative the other is about 1/4 - 1/2 a degree out.

What ive done is even it out as best I can so both positive and negative are very very slightly different, about 1/4 the width of the flybar when looking at the pitch gauge, I wont be able to spool it up until tommorow to see if it tracks OK or not.

I know ive had this problem before but cant remember what I did to get it right.

I thought about fiddleing with the fine adjustment links, but my logic tells me this wont work and I should leave them the same length, am I wrong on this.

The only other links are the ones comeing from the f/bar cage and i wouldnt think they would affect pitch, I dont think.

Any suggestions??? maybe Im just being too picky and it will track fine.

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06-05-2009 05:37 AM  8 years agoPost 2
RappyTappy

rrProfessor

Traveling the USA

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I'm assuming you're using a 600E from your profile.

First thing that comes to mind is you are having CCPM interaction and the swash is level at mid and high stick but low its slightly off causing a erroneous reading.

The other is the blade mixing levers. They have to be exactly level at 0 degrees pitch otherwise your top and bottom values won't match. So one may be on, but the other may be off. You can test it out by shortening the double link a turn and then lengthening the long link from the swash a turn for the blade that is not matching on top and bottom pitch. The 0 pitch will stay the same, but the angle of the blade mixing lever will be different and result in different top and bottom values.

Hope this helps a bit.

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06-05-2009 05:43 AM  8 years agoPost 3
Spitfire1

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Perth Australia

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Ok, thanx, very much appreciated. This is the Trex 500e im trying to get set up to fly tommorow, I got lucky with my 600e.

Ill look at the mixing levers at zero, everything just so dam small on these things its so hard to tell by eye.

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06-05-2009 06:10 AM  8 years agoPost 4
Spitfire1

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Perth Australia

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No ****, trying to get these pitches right on this 500 is driveing me up the wall. Cant ever recall haveing this much trouble trying to get a head set up correctly before.

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06-05-2009 06:37 AM  8 years agoPost 5
RappyTappy

rrProfessor

Traveling the USA

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You don't have to really eyeball the mixing levers. Just play around with the angles by going like one turn shorter on the double link and one turn longer on the long link and check the results with the pitch gauge. When the values match up then you know you have the right angle. It only has two places to go, worse or better

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06-05-2009 06:41 AM  8 years agoPost 6
Spitfire1

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Perth Australia

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you mean the longer ones that go from the swash to the otherside of the lever the main grip links connect to right??

I got my 12 deg up went to bottom, adjusted that longer one to get em both right down there, but of coarse then its out up top, Ill try adjusting half a turn on both of em this time and see how that goes.

The only other ones are the shorter ones that hang of the flybare cage, Im pretty sure there the same, and I could be wrong but I dont think they would have much effect on pitch.

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06-05-2009 06:48 AM  8 years agoPost 7
RappyTappy

rrProfessor

Traveling the USA

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Yes, you adjust the double link(to the blade grip) and the long link(from the mixer to the swash) at the same time. You should be able to read 0 degrees at half stick,adjust both links opposite ways at the same time to change the angle of the mixer, and then remeasure and the blade should still read 0 degrees at half stick.

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06-05-2009 07:19 AM  8 years agoPost 8
Spitfire1

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Perth Australia

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Jesus christ! I think ive actually got it finally!!

This has been keeping me awake the last 2 nights.

Thanx for the help, I think what your refering too is something like I did, not too sure but, I do have a splitting head ache though.

Jason.

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06-05-2009 07:45 AM  8 years agoPost 9
RappyTappy

rrProfessor

Traveling the USA

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Good deal, have fun tomorrow

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HelicopterBeginners Corner › Both blades 12 deg positive but negative one blade 11 one 12???
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