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As rpm increases, tracking goes off!

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As rpm increases, tracking goes off!

Old 06-09-2007, 08:41 PM
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shredder777
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Default As rpm increases, tracking goes off!

Hello, I have 2 nexus and I have a problem with the blade tracking at high rpm with the new one.

One is old which had a tail vibration problem. and, I have a new one with main blade tracking problem.

So, I decided to move all my radio gear from the old to the new nexus along with the head/swash blade.

When I have the throttle at 1/4, the blades track perfect but when I give it throttle at 50% it is hovering but the blades are off.



In my radio, if I set the pitch curve to get the heli to hover at low rpm, the stick is not at mid throttle, Its at 1/4. really weird. it's obvious I cant fly it like this.


can someone help.

Old 06-10-2007, 05:48 AM
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BarracudaHockey
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Default RE: As rpm increases, tracking goes off!

Which head do you have? One has a solid axle between the blades, the other the grips can flop up and down independently.
Old 06-10-2007, 08:13 AM
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Cyberfyn
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Default RE: As rpm increases, tracking goes off!

As cuda says. If its the flapping head system it could be a problem there (Bush, bearing, LOOSE) Did you check the pitch is the same on both blades? ie Mid stick should be +5 degrees pitch. If one is +5 and the other is +6 then that would cause the problem you mention. Make sure all linkages are EXACTLY the same length. Blade CofG can cause problems but not as severe though.

Ian F.
Old 06-10-2007, 10:17 AM
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shredder777
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Default RE: As rpm increases, tracking goes off!

everything is as you say. I rebuilt the heli with the old one that worked except for the tail issue which is fixed.

I did noticed the clutch on the main gear bearing that is suppose to spin one way was frozen. We freed it and now it seems to spin correctly.

oh, the head is solid.

Thank you guys for the support and help.
Old 06-10-2007, 09:55 PM
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shredder777
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Default RE: As rpm increases, tracking goes off!

Hey guys, well, We managed to get the heli flyable today. We found out that when the blades get under a load, the blades get off track. so, my friend had to program the radio to give it a certain amount of throttle while in hover.


It seems when the motor is spinning at full throttle, it goes out of track. when we see that one blade is too low, we adjust it and then it becomes too high.

any suggestions?

Thanks again.
Old 06-10-2007, 10:51 PM
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Default RE: As rpm increases, tracking goes off!

Check that 1 low blade and maks sure it's not to loose in the grips.
The grip itself may be loose.
This is a common problem and the best way to see if the blades are at fault is to try another set.
Make sure the paddles are 100% horizontal and that the blades have been balanced and the CG is right on.
Make only 1 turn a a time on the linkage your adjusting.
Vegas/
Old 06-11-2007, 10:29 AM
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Default RE: As rpm increases, tracking goes off!

Remove one blade and extend the other one straight out.

Put a nut driver on the lock nut thats on the spindle shaft that runs between the main blade grips and turn it.

If the other blade tip wobbles or moves at all the spindle shaft is bent and needs to be replaced.

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